Revert "chat api (#991)" while context variable is fixed

This reverts commit 7a0899d62dee8a55810446dd7655b9e682ddf8ac.

api/client.go

@@ -221,19 +221,6 @@ func (c *Client) Generate(ctx context.Context, req *GenerateRequest, fn Generate
 	})
 }
 
-type ChatResponseFunc func(ChatResponse) error
-
-func (c *Client) Chat(ctx context.Context, req *ChatRequest, fn ChatResponseFunc) error {
-	return c.stream(ctx, http.MethodPost, "/api/chat", req, func(bts []byte) error {
-		var resp ChatResponse
-		if err := json.Unmarshal(bts, &resp); err != nil {
-			return err
-		}
-
-		return fn(resp)
-	})
-}
-
 type PullProgressFunc func(ProgressResponse) error
 
 func (c *Client) Pull(ctx context.Context, req *PullRequest, fn PullProgressFunc) error {

api/types.go

@@ -36,7 +36,7 @@ type GenerateRequest struct {
 	Prompt   string `json:"prompt"`
 	System   string `json:"system"`
 	Template string `json:"template"`
-	Context  []int  `json:"context,omitempty"` // DEPRECATED: context is deprecated, use the /chat endpoint instead for chat history
+	Context  []int  `json:"context,omitempty"`
 	Stream   *bool  `json:"stream,omitempty"`
 	Raw      bool   `json:"raw,omitempty"`
 	Format   string `json:"format"`
@@ -44,41 +44,6 @@ type GenerateRequest struct {
 	Options map[string]interface{} `json:"options"`
 }
 
-type ChatRequest struct {
-	Model    string    `json:"model"`
-	Messages []Message `json:"messages"`
-	Template string    `json:"template"`
-	Stream   *bool     `json:"stream,omitempty"`
-	Format   string    `json:"format"`
-
-	Options map[string]interface{} `json:"options"`
-}
-
-type Message struct {
-	Role    string `json:"role"` // one of ["system", "user", "assistant"]
-	Content string `json:"content"`
-}
-
-type ChatResponse struct {
-	Model     string    `json:"model"`
-	CreatedAt time.Time `json:"created_at"`
-	Message   *Message  `json:"message,omitempty"`
-
-	Done    bool  `json:"done"`
-	Context []int `json:"context,omitempty"`
-
-	EvalMetrics
-}
-
-type EvalMetrics struct {
-	TotalDuration      time.Duration `json:"total_duration,omitempty"`
-	LoadDuration       time.Duration `json:"load_duration,omitempty"`
-	PromptEvalCount    int           `json:"prompt_eval_count,omitempty"`
-	PromptEvalDuration time.Duration `json:"prompt_eval_duration,omitempty"`
-	EvalCount          int           `json:"eval_count,omitempty"`
-	EvalDuration       time.Duration `json:"eval_duration,omitempty"`
-}
-
 // Options specfied in GenerateRequest, if you add a new option here add it to the API docs also
 type Options struct {
 	Runner
@@ -208,34 +173,39 @@ type GenerateResponse struct {
 	Done    bool  `json:"done"`
 	Context []int `json:"context,omitempty"`
 
-	EvalMetrics
+	TotalDuration      time.Duration `json:"total_duration,omitempty"`
+	LoadDuration       time.Duration `json:"load_duration,omitempty"`
+	PromptEvalCount    int           `json:"prompt_eval_count,omitempty"`
+	PromptEvalDuration time.Duration `json:"prompt_eval_duration,omitempty"`
+	EvalCount          int           `json:"eval_count,omitempty"`
+	EvalDuration       time.Duration `json:"eval_duration,omitempty"`
 }
 
-func (m *EvalMetrics) Summary() {
-	if m.TotalDuration > 0 {
-		fmt.Fprintf(os.Stderr, "total duration:       %v\n", m.TotalDuration)
+func (r *GenerateResponse) Summary() {
+	if r.TotalDuration > 0 {
+		fmt.Fprintf(os.Stderr, "total duration:       %v\n", r.TotalDuration)
 	}
 
-	if m.LoadDuration > 0 {
-		fmt.Fprintf(os.Stderr, "load duration:        %v\n", m.LoadDuration)
+	if r.LoadDuration > 0 {
+		fmt.Fprintf(os.Stderr, "load duration:        %v\n", r.LoadDuration)
 	}
 
-	if m.PromptEvalCount > 0 {
-		fmt.Fprintf(os.Stderr, "prompt eval count:    %d token(s)\n", m.PromptEvalCount)
+	if r.PromptEvalCount > 0 {
+		fmt.Fprintf(os.Stderr, "prompt eval count:    %d token(s)\n", r.PromptEvalCount)
 	}
 
-	if m.PromptEvalDuration > 0 {
-		fmt.Fprintf(os.Stderr, "prompt eval duration: %s\n", m.PromptEvalDuration)
-		fmt.Fprintf(os.Stderr, "prompt eval rate:     %.2f tokens/s\n", float64(m.PromptEvalCount)/m.PromptEvalDuration.Seconds())
+	if r.PromptEvalDuration > 0 {
+		fmt.Fprintf(os.Stderr, "prompt eval duration: %s\n", r.PromptEvalDuration)
+		fmt.Fprintf(os.Stderr, "prompt eval rate:     %.2f tokens/s\n", float64(r.PromptEvalCount)/r.PromptEvalDuration.Seconds())
 	}
 
-	if m.EvalCount > 0 {
-		fmt.Fprintf(os.Stderr, "eval count:           %d token(s)\n", m.EvalCount)
+	if r.EvalCount > 0 {
+		fmt.Fprintf(os.Stderr, "eval count:           %d token(s)\n", r.EvalCount)
 	}
 
-	if m.EvalDuration > 0 {
-		fmt.Fprintf(os.Stderr, "eval duration:        %s\n", m.EvalDuration)
-		fmt.Fprintf(os.Stderr, "eval rate:            %.2f tokens/s\n", float64(m.EvalCount)/m.EvalDuration.Seconds())
+	if r.EvalDuration > 0 {
+		fmt.Fprintf(os.Stderr, "eval duration:        %s\n", r.EvalDuration)
+		fmt.Fprintf(os.Stderr, "eval rate:            %.2f tokens/s\n", float64(r.EvalCount)/r.EvalDuration.Seconds())
 	}
 }
 

docs/api.md

@@ -24,7 +24,7 @@ All durations are returned in nanoseconds.
 
 ### Streaming responses
 
-Certain endpoints stream responses as JSON objects.
+Certain endpoints stream responses as JSON objects delineated with the newline (`\n`) character.
 
 ## Generate a completion
 
@@ -32,12 +32,10 @@ Certain endpoints stream responses as JSON objects.
 POST /api/generate
 ```
 
-Generate a response for a given prompt with a provided model. This is a streaming endpoint, so there will be a series of responses. The final response object will include statistics and additional data from the request.
+Generate a response for a given prompt with a provided model. This is a streaming endpoint, so will be a series of responses. The final response object will include statistics and additional data from the request.
 
 ### Parameters
 
-`model` is required.
-
 - `model`: (required) the [model name](#model-names)
 - `prompt`: the prompt to generate a response for
 
@@ -45,10 +43,11 @@ Advanced parameters (optional):
 
 - `format`: the format to return a response in. Currently the only accepted value is `json`
 - `options`: additional model parameters listed in the documentation for the [Modelfile](./modelfile.md#valid-parameters-and-values) such as `temperature`
-- `template`: the full prompt or prompt template (overrides what is defined in the `Modelfile`)
 - `system`: system prompt to (overrides what is defined in the `Modelfile`)
+- `template`: the full prompt or prompt template (overrides what is defined in the `Modelfile`)
+- `context`: the context parameter returned from a previous request to `/generate`, this can be used to keep a short conversational memory
 - `stream`: if `false` the response will be returned as a single response object, rather than a stream of objects
-- `raw`: if `true` no formatting will be applied to the prompt. You may choose to use the `raw` parameter if you are specifying a full templated prompt in your request to the API.
+- `raw`: if `true` no formatting will be applied to the prompt and no context will be returned. You may choose to use the `raw` parameter if you are specifying a full templated prompt in your request to the API, and are managing history yourself.
 
 ### JSON mode
 
@@ -58,7 +57,7 @@ Enable JSON mode by setting the `format` parameter to `json`. This will structur
 
 ### Examples
 
-#### Request (Prompt)
+#### Request
 
 ```shell
 curl http://localhost:11434/api/generate -d '{
@@ -90,7 +89,7 @@ The final response in the stream also includes additional data about the generat
 - `prompt_eval_duration`: time spent in nanoseconds evaluating the prompt
 - `eval_count`: number of tokens the response
 - `eval_duration`: time in nanoseconds spent generating the response
-- `context`: deprecated, an encoding of the conversation used in this response, this can be sent in the next request to keep a conversational memory
+- `context`: an encoding of the conversation used in this response, this can be sent in the next request to keep a conversational memory
 - `response`: empty if the response was streamed, if not streamed, this will contain the full response
 
 To calculate how fast the response is generated in tokens per second (token/s), divide `eval_count` / `eval_duration`.
@@ -115,8 +114,6 @@ To calculate how fast the response is generated in tokens per second (token/s),
 
 #### Request (No streaming)
 
-A response can be recieved in one reply when streaming is off.
-
 ```shell
 curl http://localhost:11434/api/generate -d '{
   "model": "llama2",
@@ -147,9 +144,9 @@ If `stream` is set to `false`, the response will be a single JSON object:
 }
 ```
 
-#### Request (Raw Mode)
+#### Request (Raw mode)
 
-In some cases you may wish to bypass the templating system and provide a full prompt. In this case, you can use the `raw` parameter to disable formatting.
+In some cases you may wish to bypass the templating system and provide a full prompt. In this case, you can use the `raw` parameter to disable formatting and context.
 
 ```shell
 curl http://localhost:11434/api/generate -d '{
@@ -167,7 +164,6 @@ curl http://localhost:11434/api/generate -d '{
   "model": "mistral",
   "created_at": "2023-11-03T15:36:02.583064Z",
   "response": " The sky appears blue because of a phenomenon called Rayleigh scattering.",
-  "context": [1, 2, 3],
   "done": true,
   "total_duration": 14648695333,
   "load_duration": 3302671417,
@@ -279,6 +275,7 @@ curl http://localhost:11434/api/generate -d '{
   "model": "llama2",
   "created_at": "2023-08-04T19:22:45.499127Z",
   "response": "The sky is blue because it is the color of the sky.",
+  "context": [1, 2, 3],
   "done": true,
   "total_duration": 5589157167,
   "load_duration": 3013701500,
@@ -291,135 +288,6 @@ curl http://localhost:11434/api/generate -d '{
 }
 ```
 
-## Send Chat Messages
-```shell
-POST /api/chat
-```
-
-Generate the next message in a chat with a provided model. This is a streaming endpoint, so there will be a series of responses. The final response object will include statistics and additional data from the request.
-
-### Parameters
-
-`model` is required.
-
-- `model`: (required) the [model name](#model-names)
-- `messages`: the messages of the chat, this can be used to keep a chat memory
-
-Advanced parameters (optional):
-
-- `format`: the format to return a response in. Currently the only accepted value is `json`
-- `options`: additional model parameters listed in the documentation for the [Modelfile](./modelfile.md#valid-parameters-and-values) such as `temperature`
-- `template`: the full prompt or prompt template (overrides what is defined in the `Modelfile`)
-- `stream`: if `false` the response will be returned as a single response object, rather than a stream of objects
-
-### Examples
-
-#### Request
-Send a chat message with a streaming response.
-
-```shell
-curl http://localhost:11434/api/generate -d '{
-  "model": "llama2",
-  "messages": [
-    {
-      "role": "user",
-      "content": "why is the sky blue?"
-    }
-  ]
-}'
-```
-
-#### Response
-
-A stream of JSON objects is returned:
-
-```json
-{
-  "model": "llama2",
-  "created_at": "2023-08-04T08:52:19.385406455-07:00",
-  "message": {
-    "role": "assisant",
-    "content": "The"
-  },
-  "done": false
-}
-```
-
-Final response:
-
-```json
-{
-  "model": "llama2",
-  "created_at": "2023-08-04T19:22:45.499127Z",
-  "done": true,
-  "total_duration": 5589157167,
-  "load_duration": 3013701500,
-  "sample_count": 114,
-  "sample_duration": 81442000,
-  "prompt_eval_count": 46,
-  "prompt_eval_duration": 1160282000,
-  "eval_count": 113,
-  "eval_duration": 1325948000
-}
-```
-
-#### Request (With History)
-Send a chat message with a conversation history.
-
-```shell
-curl http://localhost:11434/api/generate -d '{
-  "model": "llama2",
-  "messages": [
-    {
-      "role": "user",
-      "content": "why is the sky blue?"
-    },
-    {
-      "role": "assistant",
-      "content": "due to rayleigh scattering."
-    },
-    {
-      "role": "user",
-      "content": "how is that different than mie scattering?"
-    }
-  ]
-}'
-```
-
-#### Response
-
-A stream of JSON objects is returned:
-
-```json
-{
-  "model": "llama2",
-  "created_at": "2023-08-04T08:52:19.385406455-07:00",
-  "message": {
-    "role": "assisant",
-    "content": "The"
-  },
-  "done": false
-}
-```
-
-Final response:
-
-```json
-{
-  "model": "llama2",
-  "created_at": "2023-08-04T19:22:45.499127Z",
-  "done": true,
-  "total_duration": 5589157167,
-  "load_duration": 3013701500,
-  "sample_count": 114,
-  "sample_duration": 81442000,
-  "prompt_eval_count": 46,
-  "prompt_eval_duration": 1160282000,
-  "eval_count": 113,
-  "eval_duration": 1325948000
-}
-```
-
 ## Create a Model
 
 ```shell

llm/llama.go

@@ -531,31 +531,21 @@ type prediction struct {
 
 const maxBufferSize = 512 * format.KiloByte
 
-type PredictRequest struct {
-	Model            string
-	Prompt           string
-	Format           string
-	CheckpointStart  time.Time
-	CheckpointLoaded time.Time
-}
-
-type PredictResponse struct {
-	Model              string
-	CreatedAt          time.Time
-	TotalDuration      time.Duration
-	LoadDuration       time.Duration
-	Content            string
-	Done               bool
-	PromptEvalCount    int
-	PromptEvalDuration time.Duration
-	EvalCount          int
-	EvalDuration       time.Duration
-	Context            []int
-}
-
-func (llm *llama) Predict(ctx context.Context, predict PredictRequest, fn func(PredictResponse)) error {
+func (llm *llama) Predict(ctx context.Context, prevContext []int, prompt string, format string, fn func(api.GenerateResponse)) error {
+	prevConvo, err := llm.Decode(ctx, prevContext)
+	if err != nil {
+		return err
+	}
+
+	// Remove leading spaces from prevConvo if present
+	prevConvo = strings.TrimPrefix(prevConvo, " ")
+
+	var nextContext strings.Builder
+	nextContext.WriteString(prevConvo)
+	nextContext.WriteString(prompt)
+
 	request := map[string]any{
-		"prompt":            predict.Prompt,
+		"prompt":            nextContext.String(),
 		"stream":            true,
 		"n_predict":         llm.NumPredict,
 		"n_keep":            llm.NumKeep,
@@ -577,7 +567,7 @@ func (llm *llama) Predict(ctx context.Context, predict PredictRequest, fn func(P
 		"stop":              llm.Stop,
 	}
 
-	if predict.Format == "json" {
+	if format == "json" {
 		request["grammar"] = jsonGrammar
 	}
 
@@ -634,25 +624,25 @@ func (llm *llama) Predict(ctx context.Context, predict PredictRequest, fn func(P
 				}
 
 				if p.Content != "" {
-					fn(PredictResponse{
-						Model:     predict.Model,
-						CreatedAt: time.Now().UTC(),
-						Content:   p.Content,
-					})
+					fn(api.GenerateResponse{Response: p.Content})
+					nextContext.WriteString(p.Content)
 				}
 
 				if p.Stop {
-					fn(PredictResponse{
-						Model:         predict.Model,
-						CreatedAt:     time.Now().UTC(),
-						TotalDuration: time.Since(predict.CheckpointStart),
+					embd, err := llm.Encode(ctx, nextContext.String())
+					if err != nil {
+						return fmt.Errorf("encoding context: %v", err)
+					}
 
+					fn(api.GenerateResponse{
 						Done:               true,
+						Context:            embd,
 						PromptEvalCount:    p.Timings.PromptN,
 						PromptEvalDuration: parseDurationMs(p.Timings.PromptMS),
 						EvalCount:          p.Timings.PredictedN,
 						EvalDuration:       parseDurationMs(p.Timings.PredictedMS),
 					})
+
 					return nil
 				}
 			}

llm/llm.go

@@ -14,7 +14,7 @@ import (
 )
 
 type LLM interface {
-	Predict(context.Context, PredictRequest, func(PredictResponse)) error
+	Predict(context.Context, []int, string, string, func(api.GenerateResponse)) error
 	Embedding(context.Context, string) ([]float64, error)
 	Encode(context.Context, string) ([]int, error)
 	Decode(context.Context, []int) (string, error)

server/images.go

@@ -47,82 +47,37 @@ type Model struct {
 	Options       map[string]interface{}
 }
 
-type PromptVars struct {
-	System   string
-	Prompt   string
-	Response string
-}
+func (m *Model) Prompt(request api.GenerateRequest) (string, error) {
+	t := m.Template
+	if request.Template != "" {
+		t = request.Template
+	}
 
-func (m *Model) Prompt(p PromptVars) (string, error) {
-	var prompt strings.Builder
-	tmpl, err := template.New("").Parse(m.Template)
+	tmpl, err := template.New("").Parse(t)
 	if err != nil {
 		return "", err
 	}
 
-	if p.System == "" {
-		// use the default system prompt for this model if one is not specified
-		p.System = m.System
-	}
-
-	var sb strings.Builder
-	if err := tmpl.Execute(&sb, p); err != nil {
-		return "", err
+	var vars struct {
+		First  bool
+		System string
+		Prompt string
 	}
-	prompt.WriteString(sb.String())
-	prompt.WriteString(p.Response)
-	return prompt.String(), nil
-}
 
-func (m *Model) ChatPrompt(msgs []api.Message) (string, error) {
-	// build the prompt from the list of messages
-	var prompt strings.Builder
-	currentVars := PromptVars{}
+	vars.First = len(request.Context) == 0
+	vars.System = m.System
+	vars.Prompt = request.Prompt
 
-	writePrompt := func() error {
-		p, err := m.Prompt(currentVars)
-		if err != nil {
-			return err
-		}
-		prompt.WriteString(p)
-		currentVars = PromptVars{}
-		return nil
+	if request.System != "" {
+		vars.System = request.System
 	}
 
-	for _, msg := range msgs {
-		switch msg.Role {
-		case "system":
-			if currentVars.Prompt != "" || currentVars.System != "" {
-				if err := writePrompt(); err != nil {
-					return "", err
-				}
-			}
-			currentVars.System = msg.Content
-		case "user":
-			if currentVars.Prompt != "" || currentVars.System != "" {
-				if err := writePrompt(); err != nil {
-					return "", err
-				}
-			}
-			currentVars.Prompt = msg.Content
-		case "assistant":
-			currentVars.Response = msg.Content
-			if err := writePrompt(); err != nil {
-				return "", err
-			}
-		default:
-			return "", fmt.Errorf("invalid role: %s, role must be one of [system, user, assistant]", msg.Role)
-		}
-	}
-
-	// Append the last set of vars if they are non-empty
-	if currentVars.Prompt != "" || currentVars.System != "" {
-		if err := writePrompt(); err != nil {
-			return "", err
-		}
+	var sb strings.Builder
+	if err := tmpl.Execute(&sb, vars); err != nil {
+		return "", err
 	}
 
-	return prompt.String(), nil
+	return sb.String(), nil
 }
 
 type ManifestV2 struct {

server/images_test.go

@@ -2,15 +2,17 @@ package server
 
 import (
 	"testing"
+
+	"github.com/jmorganca/ollama/api"
 )
 
 func TestModelPrompt(t *testing.T) {
-	m := Model{
+	var m Model
+	req := api.GenerateRequest{
 		Template: "a{{ .Prompt }}b",
+		Prompt:   "<h1>",
 	}
-	s, err := m.Prompt(PromptVars{
-		Prompt: "<h1>",
-	})
+	s, err := m.Prompt(req)
 	if err != nil {
 		t.Fatal(err)
 	}

server/routes.go

@@ -60,26 +60,17 @@ var loaded struct {
 var defaultSessionDuration = 5 * time.Minute
 
 // load a model into memory if it is not already loaded, it is up to the caller to lock loaded.mu before calling this function
-func load(c *gin.Context, modelName string, reqOpts map[string]interface{}, sessionDuration time.Duration) (*Model, error) {
-	model, err := GetModel(modelName)
-	if err != nil {
-		return nil, err
-	}
-
-	workDir := c.GetString("workDir")
-
+func load(ctx context.Context, workDir string, model *Model, reqOpts map[string]interface{}, sessionDuration time.Duration) error {
 	opts := api.DefaultOptions()
 	if err := opts.FromMap(model.Options); err != nil {
 		log.Printf("could not load model options: %v", err)
-		return nil, err
+		return err
 	}
 
 	if err := opts.FromMap(reqOpts); err != nil {
-		return nil, err
+		return err
 	}
 
-	ctx := c.Request.Context()
-
 	// check if the loaded model is still running in a subprocess, in case something unexpected happened
 	if loaded.runner != nil {
 		if err := loaded.runner.Ping(ctx); err != nil {
@@ -115,7 +106,7 @@ func load(c *gin.Context, modelName string, reqOpts map[string]interface{}, sess
 				err = fmt.Errorf("%v: this model may be incompatible with your version of Ollama. If you previously pulled this model, try updating it by running `ollama pull %s`", err, model.ShortName)
 			}
 
-			return nil, err
+			return err
 		}
 
 		loaded.Model = model
@@ -149,7 +140,7 @@ func load(c *gin.Context, modelName string, reqOpts map[string]interface{}, sess
 	}
 
 	loaded.expireTimer.Reset(sessionDuration)
-	return model, nil
+	return nil
 }
 
 func GenerateHandler(c *gin.Context) {
@@ -182,262 +173,88 @@ func GenerateHandler(c *gin.Context) {
 		return
 	}
 
-	sessionDuration := defaultSessionDuration
-	model, err := load(c, req.Model, req.Options, sessionDuration)
+	model, err := GetModel(req.Model)
 	if err != nil {
 		var pErr *fs.PathError
-		switch {
-		case errors.As(err, &pErr):
+		if errors.As(err, &pErr) {
 			c.JSON(http.StatusNotFound, gin.H{"error": fmt.Sprintf("model '%s' not found, try pulling it first", req.Model)})
-		case errors.Is(err, api.ErrInvalidOpts):
-			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
-		default:
-			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-		}
-		return
-	}
-
-	// an empty request loads the model
-	if req.Prompt == "" && req.Template == "" && req.System == "" {
-		c.JSON(http.StatusOK, api.GenerateResponse{CreatedAt: time.Now().UTC(), Model: req.Model, Done: true})
-		return
-	}
-
-	checkpointLoaded := time.Now()
-
-	var prompt string
-	sendContext := false
-	switch {
-	case req.Raw:
-		prompt = req.Prompt
-	case req.Prompt != "":
-		if req.Template != "" {
-			// override the default model template
-			model.Template = req.Template
-		}
-
-		var rebuild strings.Builder
-		if req.Context != nil {
-			// TODO: context is deprecated, at some point the context logic within this conditional should be removed
-			prevCtx, err := loaded.runner.Decode(c.Request.Context(), req.Context)
-			if err != nil {
-				c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-				return
-			}
-
-			// Remove leading spaces from prevCtx if present
-			prevCtx = strings.TrimPrefix(prevCtx, " ")
-			rebuild.WriteString(prevCtx)
-		}
-		p, err := model.Prompt(PromptVars{
-			System: req.System,
-			Prompt: req.Prompt,
-		})
-		if err != nil {
-			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
 			return
 		}
-		rebuild.WriteString(p)
-		prompt = rebuild.String()
-		sendContext = true
-	}
-
-	ch := make(chan any)
-	var generated strings.Builder
-	go func() {
-		defer close(ch)
-
-		fn := func(r llm.PredictResponse) {
-			// Update model expiration
-			loaded.expireAt = time.Now().Add(sessionDuration)
-			loaded.expireTimer.Reset(sessionDuration)
-
-			// Build up the full response
-			if _, err := generated.WriteString(r.Content); err != nil {
-				ch <- gin.H{"error": err.Error()}
-				return
-			}
-
-			resp := api.GenerateResponse{
-				Model:     r.Model,
-				CreatedAt: r.CreatedAt,
-				Done:      r.Done,
-				Response:  r.Content,
-				EvalMetrics: api.EvalMetrics{
-					TotalDuration:      r.TotalDuration,
-					LoadDuration:       r.LoadDuration,
-					PromptEvalCount:    r.PromptEvalCount,
-					PromptEvalDuration: r.PromptEvalDuration,
-					EvalCount:          r.EvalCount,
-					EvalDuration:       r.EvalDuration,
-				},
-			}
-
-			if r.Done && sendContext {
-				embd, err := loaded.runner.Encode(c.Request.Context(), req.Prompt+generated.String())
-				if err != nil {
-					ch <- gin.H{"error": err.Error()}
-					return
-				}
-				r.Context = embd
-			}
-
-			ch <- resp
-		}
-
-		// Start prediction
-		predictReq := llm.PredictRequest{
-			Model:            model.Name,
-			Prompt:           prompt,
-			Format:           req.Format,
-			CheckpointStart:  checkpointStart,
-			CheckpointLoaded: checkpointLoaded,
-		}
-		if err := loaded.runner.Predict(c.Request.Context(), predictReq, fn); err != nil {
-			ch <- gin.H{"error": err.Error()}
-		}
-	}()
-
-	if req.Stream != nil && !*req.Stream {
-		// Wait for the channel to close
-		var r api.GenerateResponse
-		var sb strings.Builder
-		for resp := range ch {
-			var ok bool
-			if r, ok = resp.(api.GenerateResponse); !ok {
-				c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-				return
-			}
-			sb.WriteString(r.Response)
-		}
-		r.Response = sb.String()
-		c.JSON(http.StatusOK, r)
-		return
-	}
-
-	streamResponse(c, ch)
-}
-
-func ChatHandler(c *gin.Context) {
-	loaded.mu.Lock()
-	defer loaded.mu.Unlock()
-
-	checkpointStart := time.Now()
-
-	var req api.ChatRequest
-	err := c.ShouldBindJSON(&req)
-	switch {
-	case errors.Is(err, io.EOF):
-		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "missing request body"})
-		return
-	case err != nil:
-		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 		return
 	}
 
-	// validate the request
-	switch {
-	case req.Model == "":
-		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "model is required"})
-		return
-	case len(req.Format) > 0 && req.Format != "json":
-		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "format must be json"})
-		return
-	}
+	workDir := c.GetString("workDir")
 
+	// TODO: set this duration from the request if specified
 	sessionDuration := defaultSessionDuration
-	model, err := load(c, req.Model, req.Options, sessionDuration)
-	if err != nil {
-		var pErr *fs.PathError
-		switch {
-		case errors.As(err, &pErr):
-			c.JSON(http.StatusNotFound, gin.H{"error": fmt.Sprintf("model '%s' not found, try pulling it first", req.Model)})
-		case errors.Is(err, api.ErrInvalidOpts):
+	if err := load(c.Request.Context(), workDir, model, req.Options, sessionDuration); err != nil {
+		if errors.Is(err, api.ErrInvalidOpts) {
 			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
-		default:
-			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+			return
 		}
-		return
-	}
-
-	// an empty request loads the model
-	if len(req.Messages) == 0 {
-		c.JSON(http.StatusOK, api.ChatResponse{CreatedAt: time.Now().UTC(), Model: req.Model, Done: true})
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
 		return
 	}
 
 	checkpointLoaded := time.Now()
 
-	if req.Template != "" {
-		// override the default model template
-		model.Template = req.Template
-	}
-	prompt, err := model.ChatPrompt(req.Messages)
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
-		return
+	prompt := req.Prompt
+	if !req.Raw {
+		prompt, err = model.Prompt(req)
+		if err != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+			return
+		}
 	}
 
 	ch := make(chan any)
-
 	go func() {
 		defer close(ch)
+		// an empty request loads the model
+		if req.Prompt == "" && req.Template == "" && req.System == "" {
+			ch <- api.GenerateResponse{CreatedAt: time.Now().UTC(), Model: req.Model, Done: true}
+			return
+		}
 
-		fn := func(r llm.PredictResponse) {
-			// Update model expiration
+		fn := func(r api.GenerateResponse) {
 			loaded.expireAt = time.Now().Add(sessionDuration)
 			loaded.expireTimer.Reset(sessionDuration)
 
-			resp := api.ChatResponse{
-				Model:     r.Model,
-				CreatedAt: r.CreatedAt,
-				Done:      r.Done,
-				EvalMetrics: api.EvalMetrics{
-					TotalDuration:      r.TotalDuration,
-					LoadDuration:       r.LoadDuration,
-					PromptEvalCount:    r.PromptEvalCount,
-					PromptEvalDuration: r.PromptEvalDuration,
-					EvalCount:          r.EvalCount,
-					EvalDuration:       r.EvalDuration,
-				},
+			r.Model = req.Model
+			r.CreatedAt = time.Now().UTC()
+			if r.Done {
+				r.TotalDuration = time.Since(checkpointStart)
+				r.LoadDuration = checkpointLoaded.Sub(checkpointStart)
 			}
 
-			if !r.Done {
-				resp.Message = &api.Message{Role: "assistant", Content: r.Content}
+			if req.Raw {
+				// in raw mode the client must manage history on their own
+				r.Context = nil
 			}
 
-			ch <- resp
+			ch <- r
 		}
 
-		// Start prediction
-		predictReq := llm.PredictRequest{
-			Model:            model.Name,
-			Prompt:           prompt,
-			Format:           req.Format,
-			CheckpointStart:  checkpointStart,
-			CheckpointLoaded: checkpointLoaded,
-		}
-		if err := loaded.runner.Predict(c.Request.Context(), predictReq, fn); err != nil {
+		if err := loaded.runner.Predict(c.Request.Context(), req.Context, prompt, req.Format, fn); err != nil {
 			ch <- gin.H{"error": err.Error()}
 		}
 	}()
 
 	if req.Stream != nil && !*req.Stream {
-		// Wait for the channel to close
-		var r api.ChatResponse
-		var sb strings.Builder
+		var response api.GenerateResponse
+		generated := ""
 		for resp := range ch {
-			var ok bool
-			if r, ok = resp.(api.ChatResponse); !ok {
+			if r, ok := resp.(api.GenerateResponse); ok {
+				generated += r.Response
+				response = r
+			} else {
 				c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
 				return
 			}
-			if r.Message != nil {
-				sb.WriteString(r.Message.Content)
-			}
 		}
-		r.Message = &api.Message{Role: "assistant", Content: sb.String()}
-		c.JSON(http.StatusOK, r)
+		response.Response = generated
+		c.JSON(http.StatusOK, response)
 		return
 	}
 
@@ -464,18 +281,15 @@ func EmbeddingHandler(c *gin.Context) {
 		return
 	}
 
-	sessionDuration := defaultSessionDuration
-	_, err = load(c, req.Model, req.Options, sessionDuration)
+	model, err := GetModel(req.Model)
 	if err != nil {
-		var pErr *fs.PathError
-		switch {
-		case errors.As(err, &pErr):
-			c.JSON(http.StatusNotFound, gin.H{"error": fmt.Sprintf("model '%s' not found, try pulling it first", req.Model)})
-		case errors.Is(err, api.ErrInvalidOpts):
-			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
-		default:
-			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-		}
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	workDir := c.GetString("workDir")
+	if err := load(c.Request.Context(), workDir, model, req.Options, 5*time.Minute); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 		return
 	}
 
@@ -953,7 +767,6 @@ func Serve(ln net.Listener, allowOrigins []string) error {
 
 	r.POST("/api/pull", PullModelHandler)
 	r.POST("/api/generate", GenerateHandler)
-	r.POST("/api/chat", ChatHandler)
 	r.POST("/api/embeddings", EmbeddingHandler)
 	r.POST("/api/create", CreateModelHandler)
 	r.POST("/api/push", PushModelHandler)