feat: add native Mistral AI provider support

Add Mistral as a first-class provider alongside the 17 existing ones.
Mistral uses the OpenAI-compatible API at https://api.mistral.ai/v1
with provider-specific model prefix stripping (mistral/model → model).

Changes:
- Add Mistral to ProvidersConfig, IsEmpty(), HasProvidersConfig()
- Add mistral entry in default model_list (defaults.go)
- Add mistral protocol in factory_provider.go and getDefaultAPIBase()
- Add mistral prefix stripping in openai_compat normalizeModel()
- Add mistral case in legacy factory.go resolveProviderSelection()
- Add mistral migration entry in ConvertProvidersToModelList()
- Add mistral to supported providers in migrate/config.go
- Add mistral section in config.example.json
- Update AllProviders test (17 → 18 providers)

Tested end-to-end with mistral-small-latest model.

config/config.example.json

@@ -196,6 +196,10 @@
     "volcengine": {
       "api_key": "",
       "api_base": ""
+    },
+    "mistral": {
+      "api_key": "",
+      "api_base": "https://api.mistral.ai/v1"
     }
   },
   "tools": {

pkg/config/config.go

@@ -324,6 +324,7 @@ type ProvidersConfig struct {
 	GitHubCopilot ProviderConfig       `json:"github_copilot"`
 	Antigravity   ProviderConfig       `json:"antigravity"`
 	Qwen          ProviderConfig       `json:"qwen"`
+	Mistral       ProviderConfig       `json:"mistral"`
 }
 
 // IsEmpty checks if all provider configs are empty (no API keys or API bases set)
@@ -345,7 +346,8 @@ func (p ProvidersConfig) IsEmpty() bool {
 		p.VolcEngine.APIKey == "" && p.VolcEngine.APIBase == "" &&
 		p.GitHubCopilot.APIKey == "" && p.GitHubCopilot.APIBase == "" &&
 		p.Antigravity.APIKey == "" && p.Antigravity.APIBase == "" &&
-		p.Qwen.APIKey == "" && p.Qwen.APIBase == ""
+		p.Qwen.APIKey == "" && p.Qwen.APIBase == "" &&
+		p.Mistral.APIKey == "" && p.Mistral.APIBase == ""
 }
 
 // MarshalJSON implements custom JSON marshaling for ProvidersConfig
@@ -636,7 +638,8 @@ func (c *Config) HasProvidersConfig() bool {
 		v.VolcEngine.APIKey != "" || v.VolcEngine.APIBase != "" ||
 		v.GitHubCopilot.APIKey != "" || v.GitHubCopilot.APIBase != "" ||
 		v.Antigravity.APIKey != "" || v.Antigravity.APIBase != "" ||
-		v.Qwen.APIKey != "" || v.Qwen.APIBase != ""
+		v.Qwen.APIKey != "" || v.Qwen.APIBase != "" ||
+		v.Mistral.APIKey != "" || v.Mistral.APIBase != ""
 }
 
 // ValidateModelList validates all ModelConfig entries in the model_list.

pkg/config/defaults.go

@@ -255,6 +255,14 @@ func DefaultConfig() *Config {
 				APIKey:    "ollama",
 			},
 
+			// Mistral AI - https://console.mistral.ai/api-keys
+			{
+				ModelName: "mistral-small",
+				Model:     "mistral/mistral-small-latest",
+				APIBase:   "https://api.mistral.ai/v1",
+				APIKey:    "",
+			},
+
 			// VLLM (local) - http://localhost:8000
 			{
 				ModelName: "local-model",

pkg/config/migration.go

@@ -324,6 +324,22 @@ func ConvertProvidersToModelList(cfg *Config) []ModelConfig {
 				}, true
 			},
 		},
+		{
+			providerNames: []string{"mistral"},
+			protocol:      "mistral",
+			buildConfig: func(p ProvidersConfig) (ModelConfig, bool) {
+				if p.Mistral.APIKey == "" && p.Mistral.APIBase == "" {
+					return ModelConfig{}, false
+				}
+				return ModelConfig{
+					ModelName: "mistral",
+					Model:     "mistral/mistral-small-latest",
+					APIKey:    p.Mistral.APIKey,
+					APIBase:   p.Mistral.APIBase,
+					Proxy:     p.Mistral.Proxy,
+				}, true
+			},
+		},
 	}
 
 	// Process each provider migration

pkg/config/migration_test.go

@@ -131,14 +131,15 @@ func TestConvertProvidersToModelList_AllProviders(t *testing.T) {
 			GitHubCopilot: ProviderConfig{ConnectMode: "grpc"},
 			Antigravity:   ProviderConfig{AuthMethod: "oauth"},
 			Qwen:          ProviderConfig{APIKey: "key17"},
+			Mistral:       ProviderConfig{APIKey: "key18"},
 		},
 	}
 
 	result := ConvertProvidersToModelList(cfg)
 
-	// All 17 providers should be converted
+	// All 18 providers should be converted
-	if len(result) != 17 {
+	if len(result) != 18 {
-		t.Errorf("len(result) = %d, want 17", len(result))
+		t.Errorf("len(result) = %d, want 18", len(result))
 	}
 }
 

pkg/migrate/config.go

@@ -22,6 +22,7 @@ var supportedProviders = map[string]bool{
 	"qwen":           true,
 	"deepseek":       true,
 	"github_copilot": true,
+	"mistral":        true,
 }
 
 var supportedChannels = map[string]bool{

pkg/providers/factory.go

@@ -172,6 +172,15 @@ func resolveProviderSelection(cfg *config.Config) (providerSelection, error) {
 					sel.model = "deepseek-chat"
 				}
 			}
+		case "mistral":
+			if cfg.Providers.Mistral.APIKey != "" {
+				sel.apiKey = cfg.Providers.Mistral.APIKey
+				sel.apiBase = cfg.Providers.Mistral.APIBase
+				sel.proxy = cfg.Providers.Mistral.Proxy
+				if sel.apiBase == "" {
+					sel.apiBase = "https://api.mistral.ai/v1"
+				}
+			}
 		case "github_copilot", "copilot":
 			sel.providerType = providerTypeGitHubCopilot
 			if cfg.Providers.GitHubCopilot.APIBase != "" {
@@ -275,6 +284,13 @@ func resolveProviderSelection(cfg *config.Config) (providerSelection, error) {
 			if sel.apiBase == "" {
 				sel.apiBase = "http://localhost:11434/v1"
 			}
+		case (strings.Contains(lowerModel, "mistral") || strings.HasPrefix(model, "mistral/")) && cfg.Providers.Mistral.APIKey != "":
+			sel.apiKey = cfg.Providers.Mistral.APIKey
+			sel.apiBase = cfg.Providers.Mistral.APIBase
+			sel.proxy = cfg.Providers.Mistral.Proxy
+			if sel.apiBase == "" {
+				sel.apiBase = "https://api.mistral.ai/v1"
+			}
 		case cfg.Providers.VLLM.APIBase != "":
 			sel.apiKey = cfg.Providers.VLLM.APIKey
 			sel.apiBase = cfg.Providers.VLLM.APIBase

pkg/providers/factory_provider.go

@@ -88,7 +88,7 @@ func CreateProviderFromConfig(cfg *config.ModelConfig) (LLMProvider, string, err
 
 	case "openrouter", "groq", "zhipu", "gemini", "nvidia",
 		"ollama", "moonshot", "shengsuanyun", "deepseek", "cerebras",
-		"volcengine", "vllm", "qwen":
+		"volcengine", "vllm", "qwen", "mistral":
 		// All other OpenAI-compatible HTTP providers
 		if cfg.APIKey == "" && cfg.APIBase == "" {
 			return nil, "", fmt.Errorf("api_key or api_base is required for HTTP-based protocol %q", protocol)
@@ -186,6 +186,8 @@ func getDefaultAPIBase(protocol string) string {
 		return "https://dashscope.aliyuncs.com/compatible-mode/v1"
 	case "vllm":
 		return "http://localhost:8000/v1"
+	case "mistral":
+		return "https://api.mistral.ai/v1"
 	default:
 		return ""
 	}

pkg/providers/openai_compat/provider.go

@@ -240,7 +240,7 @@ func normalizeModel(model, apiBase string) string {
 
 	prefix := strings.ToLower(model[:idx])
 	switch prefix {
-	case "moonshot", "nvidia", "groq", "ollama", "deepseek", "google", "openrouter", "zhipu":
+	case "moonshot", "nvidia", "groq", "ollama", "deepseek", "google", "openrouter", "zhipu", "mistral":
 		return model[idx+1:]
 	default:
 		return model