feat: add DeepSeek API support

README.md

@@ -105,6 +105,7 @@ You can configure OpenCode using environment variables:
 | `VERTEXAI_PROJECT`         | For Google Cloud VertexAI (Gemini)                                               |
 | `VERTEXAI_LOCATION`        | For Google Cloud VertexAI (Gemini)                                               |
 | `GROQ_API_KEY`             | For Groq models                                                                  |
+| `DEEPSEEK_API_KEY`         | For DeepSeek models                                                              |
 | `AWS_ACCESS_KEY_ID`        | For AWS Bedrock (Claude)                                                         |
 | `AWS_SECRET_ACCESS_KEY`    | For AWS Bedrock (Claude)                                                         |
 | `AWS_REGION`               | For AWS Bedrock (Claude)                                                         |
@@ -154,6 +155,10 @@ This is useful if you want to use a different shell than your default system she
       "apiKey": "your-api-key",
       "disabled": false
     },
+    "deepseek": {
+      "apiKey": "your-api-key",
+      "disabled": false
+    },
     "openrouter": {
       "apiKey": "your-api-key",
       "disabled": false
@@ -256,6 +261,12 @@ OpenCode supports a variety of AI models from different providers:
 - Deepseek R1 distill Llama 70b
 - Llama 3.3 70b Versatile
 
+### DeepSeek
+
+- DeepSeek Chat
+- DeepSeek Coder
+- DeepSeek Reasoner (R1)
+
 ### Azure OpenAI
 
 - GPT-4.1 family (gpt-4.1, gpt-4.1-mini, gpt-4.1-nano)

cmd/schema/main.go

@@ -196,6 +196,7 @@ func generateSchema() map[string]any {
 		string(models.ProviderOpenAI),
 		string(models.ProviderGemini),
 		string(models.ProviderGROQ),
+		string(models.ProviderDeepSeek),
 		string(models.ProviderOpenRouter),
 		string(models.ProviderBedrock),
 		string(models.ProviderAzure),

internal/config/config.go

@@ -267,6 +267,9 @@ func setProviderDefaults() {
 	if apiKey := os.Getenv("GROQ_API_KEY"); apiKey != "" {
 		viper.SetDefault("providers.groq.apiKey", apiKey)
 	}
+	if apiKey := os.Getenv("DEEPSEEK_API_KEY"); apiKey != "" {
+		viper.SetDefault("providers.deepseek.apiKey", apiKey)
+	}
 	if apiKey := os.Getenv("OPENROUTER_API_KEY"); apiKey != "" {
 		viper.SetDefault("providers.openrouter.apiKey", apiKey)
 	}
@@ -340,6 +343,15 @@ func setProviderDefaults() {
 		return
 	}
 
+	// DeepSeek configuration
+	if key := viper.GetString("providers.deepseek.apiKey"); strings.TrimSpace(key) != "" {
+		viper.SetDefault("agents.coder.model", models.DeepSeekCoder)
+		viper.SetDefault("agents.summarizer.model", models.DeepSeekChat)
+		viper.SetDefault("agents.task.model", models.DeepSeekChat)
+		viper.SetDefault("agents.title.model", models.DeepSeekChat)
+		return
+	}
+
 	// OpenRouter configuration
 	if key := viper.GetString("providers.openrouter.apiKey"); strings.TrimSpace(key) != "" {
 		viper.SetDefault("agents.coder.model", models.OpenRouterClaude37Sonnet)
@@ -651,6 +663,8 @@ func getProviderAPIKey(provider models.ModelProvider) string {
 		return os.Getenv("GEMINI_API_KEY")
 	case models.ProviderGROQ:
 		return os.Getenv("GROQ_API_KEY")
+	case models.ProviderDeepSeek:
+		return os.Getenv("DEEPSEEK_API_KEY")
 	case models.ProviderAzure:
 		return os.Getenv("AZURE_OPENAI_API_KEY")
 	case models.ProviderOpenRouter:
@@ -781,6 +795,34 @@ func setDefaultModelForAgent(agent AgentName) bool {
 		return true
 	}
 
+	if apiKey := os.Getenv("DEEPSEEK_API_KEY"); apiKey != "" {
+		var model models.ModelID
+		maxTokens := int64(5000)
+		reasoningEffort := ""
+
+		switch agent {
+		case AgentTitle:
+			model = models.DeepSeekChat
+			maxTokens = 80
+		case AgentTask:
+			model = models.DeepSeekChat
+		default:
+			model = models.DeepSeekCoder
+		}
+
+		// Check if model supports reasoning
+		if modelInfo, ok := models.SupportedModels[model]; ok && modelInfo.CanReason {
+			reasoningEffort = "medium"
+		}
+
+		cfg.Agents[agent] = Agent{
+			Model:           model,
+			MaxTokens:       maxTokens,
+			ReasoningEffort: reasoningEffort,
+		}
+		return true
+	}
+
 	if hasAWSCredentials() {
 		maxTokens := int64(5000)
 		if agent == AgentTitle {

internal/llm/models/deepseek.go

@@ -0,0 +1,56 @@
+package models
+
+const (
+	ProviderDeepSeek ModelProvider = "deepseek"
+
+	// DeepSeek Models
+	DeepSeekChat     ModelID = "deepseek-chat"
+	DeepSeekCoder    ModelID = "deepseek-coder"
+	DeepSeekReasoner ModelID = "deepseek-reasoner"
+)
+
+// DeepSeek API official models
+// https://platform.deepseek.com/api-docs/
+// Pricing as of 2025-07-01
+var DeepSeekModels = map[ModelID]Model{
+	DeepSeekChat: {
+		ID:                  DeepSeekChat,
+		Name:                "DeepSeek Chat",
+		Provider:            ProviderDeepSeek,
+		APIModel:            "deepseek-chat",
+		CostPer1MIn:         0.14,
+		CostPer1MInCached:   0.02,
+		CostPer1MOutCached:  0.0,
+		CostPer1MOut:        0.28,
+		ContextWindow:       128_000, // 官方上限 128k，推荐 ≤ 100k
+		DefaultMaxTokens:    8000,    // 官方建议输出 ≤ 8k
+		SupportsAttachments: false,   // DeepSeek 目前不支持文件上传或函数调用
+	},
+	DeepSeekCoder: {
+		ID:                  DeepSeekCoder,
+		Name:                "DeepSeek Coder",
+		Provider:            ProviderDeepSeek,
+		APIModel:            "deepseek-coder",
+		CostPer1MIn:         0.14,
+		CostPer1MInCached:   0.02,
+		CostPer1MOutCached:  0.0,
+		CostPer1MOut:        0.28,
+		ContextWindow:       128_000, // 官方上限 128k，推荐 ≤ 100k
+		DefaultMaxTokens:    8000,    // 官方建议输出 ≤ 8k
+		SupportsAttachments: false,   // DeepSeek 目前不支持文件上传或函数调用
+	},
+	DeepSeekReasoner: {
+		ID:                  DeepSeekReasoner,
+		Name:                "DeepSeek Reasoner (R1)",
+		Provider:            ProviderDeepSeek,
+		APIModel:            "deepseek-reasoner",
+		CostPer1MIn:         0.55,
+		CostPer1MInCached:   0.14,
+		CostPer1MOutCached:  0.0,
+		CostPer1MOut:        2.19,
+		ContextWindow:       65_536, // R1 模型上下文窗口
+		DefaultMaxTokens:    16000,  // R1 建议输出 ≤ 16k
+		CanReason:           true,
+		SupportsAttachments: false, // DeepSeek 目前不支持文件上传或函数调用
+	},
+}

internal/llm/models/models.go

@@ -41,10 +41,11 @@ var ProviderPopularity = map[ModelProvider]int{
 	ProviderOpenAI:     3,
 	ProviderGemini:     4,
 	ProviderGROQ:       5,
-	ProviderOpenRouter: 6,
-	ProviderBedrock:    7,
-	ProviderAzure:      8,
-	ProviderVertexAI:   9,
+	ProviderDeepSeek:   6,
+	ProviderOpenRouter: 7,
+	ProviderBedrock:    8,
+	ProviderAzure:      9,
+	ProviderVertexAI:   10,
 }
 
 var SupportedModels = map[ModelID]Model{
@@ -95,4 +96,5 @@ func init() {
 	maps.Copy(SupportedModels, XAIModels)
 	maps.Copy(SupportedModels, VertexAIGeminiModels)
 	maps.Copy(SupportedModels, CopilotModels)
+	maps.Copy(SupportedModels, DeepSeekModels)
 }

internal/llm/provider/deepseek.go

@@ -0,0 +1,25 @@
+package provider
+
+type deepseekClient struct {
+	*openaiClient
+}
+
+type DeepSeekClient ProviderClient
+
+func newDeepSeekClient(opts providerClientOptions) DeepSeekClient {
+	// DeepSeek API 的基础 URL
+	baseURL := "https://api.deepseek.com"
+
+	// 将基础 URL 添加到 OpenAI 客户端选项中
+	opts.openaiOptions = append(opts.openaiOptions,
+		WithOpenAIBaseURL(baseURL),
+	)
+
+	// 创建并返回一个包装了 openaiClient 的 deepseekClient
+	return &deepseekClient{
+		openaiClient: newOpenAIClient(opts).(*openaiClient),
+	}
+}
+
+// DeepSeek 客户端实际上就是 OpenAI 客户端，只是指向不同的 API 端点
+// 所有方法都通过嵌入的 openaiClient 来处理

internal/llm/provider/provider.go

@@ -122,6 +122,11 @@ func NewProvider(providerName models.ModelProvider, opts ...ProviderClientOption
 			options: clientOptions,
 			client:  newOpenAIClient(clientOptions),
 		}, nil
+	case models.ProviderDeepSeek:
+		return &baseProvider[DeepSeekClient]{
+			options: clientOptions,
+			client:  newDeepSeekClient(clientOptions),
+		}, nil
 	case models.ProviderAzure:
 		return &baseProvider[AzureClient]{
 			options: clientOptions,