tests: basic benchmarking test framework (#12964)

This change adds a basic benchmarking test framework for Ollama which can
be used to determine the prefill, eval, load duration, and total duration
for running a given model or models.

cmd/bench/README.md

+Ollama Benchmark Tool
+---------------------
+
+A Go-based command-line tool for benchmarking Ollama models with configurable parameters and multiple output formats.
+
+## Features
+
+ * Benchmark multiple models in a single run
+ * Support for both text and image prompts
+ * Configurable generation parameters (temperature, max tokens, seed, etc.)
+ * Supports benchstat and CSV output formats
+ * Detailed performance metrics (prefill, generate, load, total durations)
+
+## Building from Source
+
+```
+go build -o ollama-bench bench.go
+./bench -model gpt-oss:20b -epochs 6 -format csv
+```
+
+Using Go Run (without building)
+
+```
+go run bench.go -model gpt-oss:20b -epochs 3
+```
+
+## Usage
+
+### Basic Example
+
+```
+./bench -model gemma3 -epochs 6
+```
+
+### Benchmark Multiple Models
+
+```
+./bench -model gemma3,gemma3n -epochs 6 -max-tokens 100 -p "Write me a short story" | tee gemma.bench
+benchstat -col /name gemma.bench
+```
+
+### With Image Prompt
+
+```
+./bench -model qwen3-vl -image photo.jpg -epochs 6 -max-tokens 100 -p "Describe this image"
+```
+
+### Advanced Example
+
+```
+./bench -model llama3 -epochs 10 -temperature 0.7 -max-tokens 500 -seed 42 -format csv -output results.csv
+```
+
+## Command Line Options
+
+| Option  	| Description | Default |
+| -model	| Comma-separated list of models to benchmark	| (required)		|
+| -epochs	| Number of iterations per model		| 1			|
+| -max-tokens	| Maximum tokens for model response		| 0 (unlimited)		|
+| -temperature	| Temperature parameter				| 0.0			|
+| -seed		| Random seed					| 0 (random)		|
+| -timeout	| Timeout in seconds				| 300			|
+| -p		| Prompt text					| "Write a long story."	|
+| -image	| Image file to include in prompt		| 			|
+| -k		| Keep-alive duration in seconds		| 0			|
+| -format	| Output format (benchstat, csv)		| benchstat		|
+| -output	| Output file for results			| "" (stdout)		|
+| -v		| Verbose mode					| false			|
+| -debug	| Show debug information			| false			|
+
+## Output Formats
+
+### Markdown Format
+
+The default markdown format is suitable for copying and pasting into a GitHub issue and will look like:
+```
+ Model | Step | Count | Duration | nsPerToken | tokensPerSec |
+|-------|------|-------|----------|------------|--------------|
+| gpt-oss:20b | prefill | 124 | 30.006458ms | 241987.56 | 4132.44 |
+| gpt-oss:20b | generate | 200 | 2.646843954s | 13234219.77 | 75.56 |
+| gpt-oss:20b | load | 1 | 121.674208ms | - | - |
+| gpt-oss:20b | total | 1 | 2.861047625s | - | - |
+```
+
+### Benchstat Format
+
+Compatible with Go's benchstat tool for statistical analysis:
+
+```
+BenchmarkModel/name=gpt-oss:20b/step=prefill 128 78125.00 ns/token 12800.00 token/sec
+BenchmarkModel/name=gpt-oss:20b/step=generate 512 19531.25 ns/token 51200.00 token/sec
+BenchmarkModel/name=gpt-oss:20b/step=load 1 1500000000 ns/request
+```
+
+### CSV Format
+
+Machine-readable comma-separated values:
+
+```
+NAME,STEP,COUNT,NS_PER_COUNT,TOKEN_PER_SEC
+gpt-oss:20b,prefill,128,78125.00,12800.00
+gpt-oss:20b,generate,512,19531.25,51200.00
+gpt-oss:20b,load,1,1500000000,0
+```
+
+## Metrics Explained
+
+The tool reports four types of metrics for each model:
+
+ * prefill: Time spent processing the prompt
+ * generate: Time spent generating the response
+ * load: Model loading time (one-time cost)
+ * total: Total request duration
+

cmd/bench/bench.go

+package main
+
+import (
+	"cmp"
+	"context"
+	"flag"
+	"fmt"
+	"io"
+	"os"
+	"runtime"
+	"slices"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/ollama/ollama/api"
+)
+
+type flagOptions struct {
+	models      *string
+	epochs      *int
+	maxTokens   *int
+	temperature *float64
+	seed        *int
+	timeout     *int
+	prompt      *string
+	imageFile   *string
+	keepAlive   *float64
+	format      *string
+	outputFile  *string
+	debug       *bool
+	verbose     *bool
+}
+
+type Metrics struct {
+	Model    string
+	Step     string
+	Count    int
+	Duration time.Duration
+}
+
+var once sync.Once
+
+const DefaultPrompt = `Please write a descriptive story about a llama named Alonso who grows up to be President of the Land of Llamas. Include details about Alonso's childhood, adolescent years, and how he grew up to be a political mover and shaker. Write the story with a sense of whimsy.`
+
+func OutputMetrics(w io.Writer, format string, metrics []Metrics, verbose bool) {
+	switch format {
+	case "benchstat":
+		if verbose {
+			printHeader := func() {
+				fmt.Printf("sysname: %s\n", runtime.GOOS)
+				fmt.Printf("machine: %s\n", runtime.GOARCH)
+			}
+			once.Do(printHeader)
+		}
+		for _, m := range metrics {
+			if m.Step == "generate" || m.Step == "prefill" {
+				if m.Count > 0 {
+					nsPerToken := float64(m.Duration.Nanoseconds()) / float64(m.Count)
+					tokensPerSec := float64(m.Count) / (float64(m.Duration.Nanoseconds()) + 1e-12) * 1e9
+
+					fmt.Fprintf(w, "BenchmarkModel/name=%s/step=%s %d %.2f ns/token %.2f token/sec\n",
+						m.Model, m.Step, m.Count, nsPerToken, tokensPerSec)
+				} else {
+					fmt.Fprintf(w, "BenchmarkModel/name=%s/step=%s %d 0 ns/token 0 token/sec\n",
+						m.Model, m.Step, m.Count)
+				}
+			} else {
+				var suffix string
+				if m.Step == "load" {
+					suffix = "/step=load"
+				}
+				fmt.Fprintf(w, "BenchmarkModel/name=%s%s 1 %d ns/request\n",
+					m.Model, suffix, m.Duration.Nanoseconds())
+			}
+		}
+	case "csv":
+		printHeader := func() {
+			headings := []string{"NAME", "STEP", "COUNT", "NS_PER_COUNT", "TOKEN_PER_SEC"}
+			fmt.Fprintln(w, strings.Join(headings, ","))
+		}
+		once.Do(printHeader)
+
+		for _, m := range metrics {
+			if m.Step == "generate" || m.Step == "prefill" {
+				var nsPerToken float64
+				var tokensPerSec float64
+				if m.Count > 0 {
+					nsPerToken = float64(m.Duration.Nanoseconds()) / float64(m.Count)
+					tokensPerSec = float64(m.Count) / (float64(m.Duration.Nanoseconds()) + 1e-12) * 1e9
+				}
+				fmt.Fprintf(w, "%s,%s,%d,%.2f,%.2f\n", m.Model, m.Step, m.Count, nsPerToken, tokensPerSec)
+			} else {
+				fmt.Fprintf(w, "%s,%s,1,%d,0\n", m.Model, m.Step, m.Duration.Nanoseconds())
+			}
+		}
+	case "markdown":
+		printHeader := func() {
+			fmt.Fprintln(w, "| Model | Step | Count | Duration | nsPerToken | tokensPerSec |")
+			fmt.Fprintln(w, "|-------|------|-------|----------|------------|--------------|")
+		}
+		once.Do(printHeader)
+
+		for _, m := range metrics {
+			var nsPerToken, tokensPerSec float64
+			var nsPerTokenStr, tokensPerSecStr string
+
+			if m.Step == "generate" || m.Step == "prefill" {
+				nsPerToken = float64(m.Duration.Nanoseconds()) / float64(m.Count)
+				tokensPerSec = float64(m.Count) / (float64(m.Duration.Nanoseconds()) + 1e-12) * 1e9
+				nsPerTokenStr = fmt.Sprintf("%.2f", nsPerToken)
+				tokensPerSecStr = fmt.Sprintf("%.2f", tokensPerSec)
+			} else {
+				nsPerTokenStr = "-"
+				tokensPerSecStr = "-"
+			}
+
+			fmt.Fprintf(w, "| %s | %s | %d | %v | %s | %s |\n",
+				m.Model, m.Step, m.Count, m.Duration, nsPerTokenStr, tokensPerSecStr)
+		}
+	default:
+		fmt.Fprintf(os.Stderr, "Unknown output format '%s'\n", format)
+	}
+}
+
+func BenchmarkChat(fOpt flagOptions) error {
+	models := strings.Split(*fOpt.models, ",")
+
+	// todo - add multi-image support
+	var imgData api.ImageData
+	var err error
+	if *fOpt.imageFile != "" {
+		imgData, err = readImage(*fOpt.imageFile)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "ERROR: Couldn't read image '%s': %v\n", *fOpt.imageFile, err)
+			return err
+		}
+	}
+
+	if *fOpt.debug && imgData != nil {
+		fmt.Fprintf(os.Stderr, "Read file '%s'\n", *fOpt.imageFile)
+	}
+
+	client, err := api.ClientFromEnvironment()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "ERROR: Couldn't create ollama client: %v\n", err)
+		return err
+	}
+
+	for _, model := range models {
+		for range *fOpt.epochs {
+			options := make(map[string]interface{})
+			if *fOpt.maxTokens > 0 {
+				options["num_predict"] = *fOpt.maxTokens
+			}
+			options["temperature"] = *fOpt.temperature
+			if fOpt.seed != nil && *fOpt.seed > 0 {
+				options["seed"] = *fOpt.seed
+			}
+
+			var keepAliveDuration *api.Duration
+			if *fOpt.keepAlive > 0 {
+				duration := api.Duration{Duration: time.Duration(*fOpt.keepAlive * float64(time.Second))}
+				keepAliveDuration = &duration
+			}
+
+			req := &api.ChatRequest{
+				Model: model,
+				Messages: []api.Message{
+					{
+						Role:    "user",
+						Content: *fOpt.prompt,
+					},
+				},
+				Options:   options,
+				KeepAlive: keepAliveDuration,
+			}
+
+			if imgData != nil {
+				req.Messages[0].Images = []api.ImageData{imgData}
+			}
+
+			var responseMetrics *api.Metrics
+
+			ctx, cancel := context.WithTimeout(context.Background(), time.Duration(*fOpt.timeout)*time.Second)
+			defer cancel()
+
+			err = client.Chat(ctx, req, func(resp api.ChatResponse) error {
+				if *fOpt.debug {
+					fmt.Fprintf(os.Stderr, "%s", cmp.Or(resp.Message.Thinking, resp.Message.Content))
+				}
+
+				if resp.Done {
+					responseMetrics = &resp.Metrics
+				}
+				return nil
+			})
+
+			if *fOpt.debug {
+				fmt.Fprintln(os.Stderr)
+			}
+
+			if err != nil {
+				if ctx.Err() == context.DeadlineExceeded {
+					fmt.Fprintf(os.Stderr, "ERROR: Chat request timed out with model '%s' after %vs\n", model, 1)
+					continue
+				}
+				fmt.Fprintf(os.Stderr, "ERROR: Couldn't chat with model '%s': %v\n", model, err)
+				continue
+			}
+
+			if responseMetrics == nil {
+				fmt.Fprintf(os.Stderr, "ERROR: No metrics received for model '%s'\n", model)
+				continue
+			}
+
+			metrics := []Metrics{
+				{
+					Model:    model,
+					Step:     "prefill",
+					Count:    responseMetrics.PromptEvalCount,
+					Duration: responseMetrics.PromptEvalDuration,
+				},
+				{
+					Model:    model,
+					Step:     "generate",
+					Count:    responseMetrics.EvalCount,
+					Duration: responseMetrics.EvalDuration,
+				},
+				{
+					Model:    model,
+					Step:     "load",
+					Count:    1,
+					Duration: responseMetrics.LoadDuration,
+				},
+				{
+					Model:    model,
+					Step:     "total",
+					Count:    1,
+					Duration: responseMetrics.TotalDuration,
+				},
+			}
+
+			OutputMetrics(os.Stdout, *fOpt.format, metrics, *fOpt.verbose)
+
+			if *fOpt.keepAlive > 0 {
+				time.Sleep(time.Duration(*fOpt.keepAlive*float64(time.Second)) + 200*time.Millisecond)
+			}
+		}
+	}
+	return nil
+}
+
+func readImage(filePath string) (api.ImageData, error) {
+	file, err := os.Open(filePath)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	data, err := io.ReadAll(file)
+	if err != nil {
+		return nil, err
+	}
+
+	return api.ImageData(data), nil
+}
+
+func main() {
+	fOpt := flagOptions{
+		models:      flag.String("model", "", "Model to benchmark"),
+		epochs:      flag.Int("epochs", 6, "Number of epochs (iterations) per model"),
+		maxTokens:   flag.Int("max-tokens", 200, "Maximum tokens for model response"),
+		temperature: flag.Float64("temperature", 0, "Temperature parameter"),
+		seed:        flag.Int("seed", 0, "Random seed"),
+		timeout:     flag.Int("timeout", 60*5, "Timeout in seconds (default 300s)"),
+		prompt:      flag.String("p", DefaultPrompt, "Prompt to use"),
+		imageFile:   flag.String("image", "", "Filename for an image to include"),
+		keepAlive:   flag.Float64("k", 0, "Keep alive duration in seconds"),
+		format:      flag.String("format", "markdown", "Output format [benchstat|csv] (default benchstat)"),
+		outputFile:  flag.String("output", "", "Output file for results (stdout if empty)"),
+		verbose:     flag.Bool("v", false, "Show system information"),
+		debug:       flag.Bool("debug", false, "Show debug information"),
+	}
+
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, "Usage: %s [OPTIONS]\n\n", os.Args[0])
+		fmt.Fprintf(os.Stderr, "Description:\n")
+		fmt.Fprintf(os.Stderr, "  Model benchmarking tool with configurable parameters\n\n")
+		fmt.Fprintf(os.Stderr, "Options:\n")
+		flag.PrintDefaults()
+		fmt.Fprintf(os.Stderr, "\nExamples:\n")
+		fmt.Fprintf(os.Stderr, "  bench -model gpt-oss:20b -epochs 3 -temperature 0.7\n")
+	}
+	flag.Parse()
+
+	if !slices.Contains([]string{"markdown", "benchstat", "csv"}, *fOpt.format) {
+		fmt.Fprintf(os.Stderr, "ERROR: Unknown format '%s'\n", *fOpt.format)
+		os.Exit(1)
+	}
+
+	if len(*fOpt.models) == 0 {
+		fmt.Fprintf(os.Stderr, "ERROR: No model(s) specified to benchmark.\n")
+		flag.Usage()
+		return
+	}
+
+	BenchmarkChat(fOpt)
+}

cmd/bench/bench_test.go

+package main
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/json"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/ollama/ollama/api"
+)
+
+func createTestFlagOptions() flagOptions {
+	models := "test-model"
+	format := "benchstat"
+	epochs := 1
+	maxTokens := 100
+	temperature := 0.7
+	seed := 42
+	timeout := 30
+	prompt := "test prompt"
+	imageFile := ""
+	keepAlive := 5.0
+	verbose := false
+	debug := false
+
+	return flagOptions{
+		models:      &models,
+		format:      &format,
+		epochs:      &epochs,
+		maxTokens:   &maxTokens,
+		temperature: &temperature,
+		seed:        &seed,
+		timeout:     &timeout,
+		prompt:      &prompt,
+		imageFile:   &imageFile,
+		keepAlive:   &keepAlive,
+		verbose:     &verbose,
+		debug:       &debug,
+	}
+}
+
+func captureOutput(f func()) string {
+	oldStdout := os.Stdout
+	oldStderr := os.Stderr
+	defer func() {
+		os.Stdout = oldStdout
+		os.Stderr = oldStderr
+	}()
+
+	r, w, _ := os.Pipe()
+	os.Stdout = w
+	os.Stderr = w
+
+	f()
+
+	w.Close()
+	var buf bytes.Buffer
+	io.Copy(&buf, r)
+	return buf.String()
+}
+
+func createMockOllamaServer(t *testing.T, responses []api.ChatResponse) *httptest.Server {
+	return httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/api/chat" {
+			t.Errorf("Expected path /api/chat, got %s", r.URL.Path)
+			http.Error(w, "Not found", http.StatusNotFound)
+			return
+		}
+
+		if r.Method != "POST" {
+			t.Errorf("Expected POST method, got %s", r.Method)
+			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+			return
+		}
+
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusOK)
+
+		for _, resp := range responses {
+			jsonData, err := json.Marshal(resp)
+			if err != nil {
+				t.Errorf("Failed to marshal response: %v", err)
+				return
+			}
+			w.Write(jsonData)
+			w.Write([]byte("\n"))
+			if f, ok := w.(http.Flusher); ok {
+				f.Flush()
+			}
+			time.Sleep(10 * time.Millisecond) // Simulate some delay
+		}
+	}))
+}
+
+func TestBenchmarkChat_Success(t *testing.T) {
+	fOpt := createTestFlagOptions()
+
+	mockResponses := []api.ChatResponse{
+		{
+			Model: "test-model",
+			Message: api.Message{
+				Role:    "assistant",
+				Content: "test response part 1",
+			},
+			Done: false,
+		},
+		{
+			Model: "test-model",
+			Message: api.Message{
+				Role:    "assistant",
+				Content: "test response part 2",
+			},
+			Done: true,
+			Metrics: api.Metrics{
+				PromptEvalCount:    10,
+				PromptEvalDuration: 100 * time.Millisecond,
+				EvalCount:          50,
+				EvalDuration:       500 * time.Millisecond,
+				TotalDuration:      600 * time.Millisecond,
+				LoadDuration:       50 * time.Millisecond,
+			},
+		},
+	}
+
+	server := createMockOllamaServer(t, mockResponses)
+	defer server.Close()
+
+	t.Setenv("OLLAMA_HOST", server.URL)
+
+	output := captureOutput(func() {
+		err := BenchmarkChat(fOpt)
+		if err != nil {
+			t.Errorf("Expected no error, got %v", err)
+		}
+	})
+
+	if !strings.Contains(output, "BenchmarkModel/name=test-model/step=prefill") {
+		t.Errorf("Expected output to contain prefill metrics, got: %s", output)
+	}
+	if !strings.Contains(output, "BenchmarkModel/name=test-model/step=generate") {
+		t.Errorf("Expected output to contain generate metrics, got: %s", output)
+	}
+	if !strings.Contains(output, "ns/token") {
+		t.Errorf("Expected output to contain ns/token metric, got: %s", output)
+	}
+}
+
+func TestBenchmarkChat_ServerError(t *testing.T) {
+	fOpt := createTestFlagOptions()
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		http.Error(w, "Internal server error", http.StatusInternalServerError)
+	}))
+	defer server.Close()
+
+	t.Setenv("OLLAMA_HOST", server.URL)
+
+	output := captureOutput(func() {
+		err := BenchmarkChat(fOpt)
+		if err != nil {
+			t.Errorf("Expected error to be handled internally, got returned error: %v", err)
+		}
+	})
+
+	if !strings.Contains(output, "ERROR: Couldn't chat with model") {
+		t.Errorf("Expected error message about chat failure, got: %s", output)
+	}
+}
+
+func TestBenchmarkChat_Timeout(t *testing.T) {
+	fOpt := createTestFlagOptions()
+	shortTimeout := 1 // Very short timeout
+	fOpt.timeout = &shortTimeout
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Simulate a long delay that will cause timeout
+		time.Sleep(2 * time.Second)
+
+		w.Header().Set("Content-Type", "application/json")
+		response := api.ChatResponse{
+			Model: "test-model",
+			Message: api.Message{
+				Role:    "assistant",
+				Content: "test response",
+			},
+			Done: true,
+			Metrics: api.Metrics{
+				PromptEvalCount:    10,
+				PromptEvalDuration: 100 * time.Millisecond,
+				EvalCount:          50,
+				EvalDuration:       500 * time.Millisecond,
+				TotalDuration:      600 * time.Millisecond,
+				LoadDuration:       50 * time.Millisecond,
+			},
+		}
+		jsonData, _ := json.Marshal(response)
+		w.Write(jsonData)
+	}))
+	defer server.Close()
+
+	t.Setenv("OLLAMA_HOST", server.URL)
+
+	output := captureOutput(func() {
+		err := BenchmarkChat(fOpt)
+		if err != nil {
+			t.Errorf("Expected timeout to be handled internally, got returned error: %v", err)
+		}
+	})
+
+	if !strings.Contains(output, "ERROR: Chat request timed out") {
+		t.Errorf("Expected timeout error message, got: %s", output)
+	}
+}
+
+func TestBenchmarkChat_NoMetrics(t *testing.T) {
+	fOpt := createTestFlagOptions()
+
+	mockResponses := []api.ChatResponse{
+		{
+			Model: "test-model",
+			Message: api.Message{
+				Role:    "assistant",
+				Content: "test response",
+			},
+			Done: false, // Never sends Done=true
+		},
+	}
+
+	server := createMockOllamaServer(t, mockResponses)
+	defer server.Close()
+
+	t.Setenv("OLLAMA_HOST", server.URL)
+
+	output := captureOutput(func() {
+		err := BenchmarkChat(fOpt)
+		if err != nil {
+			t.Errorf("Expected no error, got %v", err)
+		}
+	})
+
+	if !strings.Contains(output, "ERROR: No metrics received") {
+		t.Errorf("Expected no metrics error message, got: %s", output)
+	}
+}
+
+func TestBenchmarkChat_MultipleModels(t *testing.T) {
+	fOpt := createTestFlagOptions()
+	models := "model1,model2"
+	epochs := 2
+	fOpt.models = &models
+	fOpt.epochs = &epochs
+
+	callCount := 0
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		callCount++
+
+		w.Header().Set("Content-Type", "application/json")
+
+		var req api.ChatRequest
+		body, _ := io.ReadAll(r.Body)
+		json.Unmarshal(body, &req)
+
+		response := api.ChatResponse{
+			Model: req.Model,
+			Message: api.Message{
+				Role:    "assistant",
+				Content: "test response for " + req.Model,
+			},
+			Done: true,
+			Metrics: api.Metrics{
+				PromptEvalCount:    10,
+				PromptEvalDuration: 100 * time.Millisecond,
+				EvalCount:          50,
+				EvalDuration:       500 * time.Millisecond,
+				TotalDuration:      600 * time.Millisecond,
+				LoadDuration:       50 * time.Millisecond,
+			},
+		}
+		jsonData, _ := json.Marshal(response)
+		w.Write(jsonData)
+	}))
+	defer server.Close()
+
+	t.Setenv("OLLAMA_HOST", server.URL)
+
+	output := captureOutput(func() {
+		err := BenchmarkChat(fOpt)
+		if err != nil {
+			t.Errorf("Expected no error, got %v", err)
+		}
+	})
+
+	// Should be called 4 times (2 models × 2 epochs)
+	if callCount != 4 {
+		t.Errorf("Expected 4 API calls, got %d", callCount)
+	}
+
+	if !strings.Contains(output, "BenchmarkModel/name=model1") || !strings.Contains(output, "BenchmarkModel/name=model2") {
+		t.Errorf("Expected output for both models, got: %s", output)
+	}
+}
+
+func TestBenchmarkChat_WithImage(t *testing.T) {
+	fOpt := createTestFlagOptions()
+
+	tmpfile, err := os.CreateTemp(t.TempDir(), "testimage")
+	if err != nil {
+		t.Fatalf("Failed to create temp file: %v", err)
+	}
+	defer os.Remove(tmpfile.Name())
+
+	content := []byte("fake image data")
+	if _, err := tmpfile.Write(content); err != nil {
+		t.Fatalf("Failed to write to temp file: %v", err)
+	}
+	tmpfile.Close()
+
+	tmpfileName := tmpfile.Name()
+	fOpt.imageFile = &tmpfileName
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Verify the request contains image data
+		var req api.ChatRequest
+		body, _ := io.ReadAll(r.Body)
+		json.Unmarshal(body, &req)
+
+		if len(req.Messages) == 0 || len(req.Messages[0].Images) == 0 {
+			t.Error("Expected request to contain images")
+		}
+
+		w.Header().Set("Content-Type", "application/json")
+		response := api.ChatResponse{
+			Model: "test-model",
+			Message: api.Message{
+				Role:    "assistant",
+				Content: "test response with image",
+			},
+			Done: true,
+			Metrics: api.Metrics{
+				PromptEvalCount:    10,
+				PromptEvalDuration: 100 * time.Millisecond,
+				EvalCount:          50,
+				EvalDuration:       500 * time.Millisecond,
+				TotalDuration:      600 * time.Millisecond,
+				LoadDuration:       50 * time.Millisecond,
+			},
+		}
+		jsonData, _ := json.Marshal(response)
+		w.Write(jsonData)
+	}))
+	defer server.Close()
+
+	t.Setenv("OLLAMA_HOST", server.URL)
+
+	output := captureOutput(func() {
+		err := BenchmarkChat(fOpt)
+		if err != nil {
+			t.Errorf("Expected no error, got %v", err)
+		}
+	})
+
+	if !strings.Contains(output, "BenchmarkModel/name=test-model") {
+		t.Errorf("Expected benchmark output, got: %s", output)
+	}
+}
+
+func TestBenchmarkChat_ImageError(t *testing.T) {
+	randFileName := func() string {
+		const charset = "abcdefghijklmnopqrstuvwxyz0123456789"
+		const length = 8
+
+		result := make([]byte, length)
+		rand.Read(result) // Fill with random bytes
+
+		for i := range result {
+			result[i] = charset[result[i]%byte(len(charset))]
+		}
+
+		return string(result) + ".txt"
+	}
+
+	fOpt := createTestFlagOptions()
+	imageFile := randFileName()
+	fOpt.imageFile = &imageFile
+
+	output := captureOutput(func() {
+		err := BenchmarkChat(fOpt)
+		if err == nil {
+			t.Error("Expected error from image reading, got nil")
+		}
+	})
+
+	if !strings.Contains(output, "ERROR: Couldn't read image") {
+		t.Errorf("Expected image read error message, got: %s", output)
+	}
+}
+
+func TestReadImage_Success(t *testing.T) {
+	tmpfile, err := os.CreateTemp(t.TempDir(), "testimage")
+	if err != nil {
+		t.Fatalf("Failed to create temp file: %v", err)
+	}
+	defer os.Remove(tmpfile.Name())
+
+	content := []byte("fake image data")
+	if _, err := tmpfile.Write(content); err != nil {
+		t.Fatalf("Failed to write to temp file: %v", err)
+	}
+	tmpfile.Close()
+
+	imgData, err := readImage(tmpfile.Name())
+	if err != nil {
+		t.Errorf("Expected no error, got %v", err)
+	}
+
+	if imgData == nil {
+		t.Error("Expected image data, got nil")
+	}
+
+	expected := api.ImageData(content)
+	if string(imgData) != string(expected) {
+		t.Errorf("Expected image data %v, got %v", expected, imgData)
+	}
+}
+
+func TestReadImage_FileNotFound(t *testing.T) {
+	imgData, err := readImage("nonexistentfile.jpg")
+	if err == nil {
+		t.Error("Expected error for non-existent file, got nil")
+	}
+	if imgData != nil {
+		t.Error("Expected nil image data for non-existent file")
+	}
+}
+
+func TestOptionsMapCreation(t *testing.T) {
+	fOpt := createTestFlagOptions()
+
+	options := make(map[string]interface{})
+	if *fOpt.maxTokens > 0 {
+		options["num_predict"] = *fOpt.maxTokens
+	}
+	options["temperature"] = *fOpt.temperature
+	if fOpt.seed != nil && *fOpt.seed > 0 {
+		options["seed"] = *fOpt.seed
+	}
+
+	if options["num_predict"] != *fOpt.maxTokens {
+		t.Errorf("Expected num_predict %d, got %v", *fOpt.maxTokens, options["num_predict"])
+	}
+	if options["temperature"] != *fOpt.temperature {
+		t.Errorf("Expected temperature %f, got %v", *fOpt.temperature, options["temperature"])
+	}
+	if options["seed"] != *fOpt.seed {
+		t.Errorf("Expected seed %d, got %v", *fOpt.seed, options["seed"])
+	}
+}