feat: add DeepSeek as AI provider

- Install @ai-sdk/deepseek package
- Add DeepSeek provider support to lib/ai-providers.ts
- Add DeepSeek configuration to env.example
- Update README.md with DeepSeek in provider list
- Support both default and custom base URL for DeepSeek

README.md

@@ -73,6 +73,8 @@ Diagrams are represented as XML that can be rendered in draw.io. The AI processe
 -   Google AI
 -   Azure OpenAI
 -   Ollama
+-   OpenRouter
+-   DeepSeek
 
 Note that `claude-sonnet-4-5` has trained on draw.io diagrams with AWS logos, so if you want to create AWS architecture diagrams, this is the best choice.
 
@@ -105,7 +107,7 @@ cp env.example .env.local
 
 Edit `.env.local` and configure your chosen provider:
 
--   Set `AI_PROVIDER` to your chosen provider (bedrock, openai, anthropic, google, azure, ollama)
+-   Set `AI_PROVIDER` to your chosen provider (bedrock, openai, anthropic, google, azure, ollama, openrouter, deepseek)
 -   Set `AI_MODEL` to the specific model you want to use
 -   Add the required API keys for your provider
 

env.example

@@ -1,6 +1,6 @@
 # AI Provider Configuration
 # AI_PROVIDER: Which provider to use
-# Options: bedrock, openai, anthropic, google, azure, ollama, openrouter
+# Options: bedrock, openai, anthropic, google, azure, ollama, openrouter, deepseek
 # Default: bedrock
 AI_PROVIDER=bedrock
 
@@ -37,3 +37,7 @@ AI_MODEL=global.anthropic.claude-sonnet-4-5-20250929-v1:0
 # OpenRouter Configuration
 # OPENROUTER_API_KEY=sk-or-v1-...
 # OPENROUTER_BASE_URL=https://openrouter.ai/api/v1  # Optional: Custom endpoint
+
+# DeepSeek Configuration
+# DEEPSEEK_API_KEY=sk-...
+# DEEPSEEK_BASE_URL=https://api.deepseek.com/v1  # Optional: Custom endpoint

lib/ai-providers.ts

@@ -5,6 +5,7 @@ import { google, createGoogleGenerativeAI } from '@ai-sdk/google';
 import { azure, createAzure } from '@ai-sdk/azure';
 import { ollama, createOllama } from 'ollama-ai-provider-v2';
 import { createOpenRouter } from '@openrouter/ai-sdk-provider';
+import { deepseek, createDeepSeek } from '@ai-sdk/deepseek';
 
 export type ProviderName =
   | 'bedrock'
@@ -13,7 +14,8 @@ export type ProviderName =
   | 'google'
   | 'azure'
   | 'ollama'
-  | 'openrouter';
+  | 'openrouter'
+  | 'deepseek';
 
 interface ModelConfig {
   model: any;
@@ -45,6 +47,7 @@ function validateProviderCredentials(provider: ProviderName): void {
     azure: 'AZURE_API_KEY',
     ollama: null, // No credentials needed for local Ollama
     openrouter: 'OPENROUTER_API_KEY',
+    deepseek: 'DEEPSEEK_API_KEY',
   };
 
   const requiredVar = requiredEnvVars[provider];
@@ -60,7 +63,7 @@ function validateProviderCredentials(provider: ProviderName): void {
  * Get the AI model based on environment variables
  *
  * Environment variables:
- * - AI_PROVIDER: The provider to use (bedrock, openai, anthropic, google, azure, ollama, openrouter)
+ * - AI_PROVIDER: The provider to use (bedrock, openai, anthropic, google, azure, ollama, openrouter, deepseek)
  * - AI_MODEL: The model ID/name for the selected provider
  *
  * Provider-specific env vars:
@@ -72,6 +75,8 @@ function validateProviderCredentials(provider: ProviderName): void {
  * - AWS_REGION, AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY: AWS Bedrock credentials
  * - OLLAMA_BASE_URL: Ollama server URL (optional, defaults to http://localhost:11434)
  * - OPENROUTER_API_KEY: OpenRouter API key
+ * - DEEPSEEK_API_KEY: DeepSeek API key
+ * - DEEPSEEK_BASE_URL: DeepSeek endpoint (optional)
  */
 export function getAIModel(): ModelConfig {
   const provider = (process.env.AI_PROVIDER || 'bedrock') as ProviderName;
@@ -168,9 +173,21 @@ export function getAIModel(): ModelConfig {
       model = openrouter(modelId);
       break;
 
+    case 'deepseek':
+      if (process.env.DEEPSEEK_BASE_URL) {
+        const customDeepSeek = createDeepSeek({
+          apiKey: process.env.DEEPSEEK_API_KEY,
+          baseURL: process.env.DEEPSEEK_BASE_URL,
+        });
+        model = customDeepSeek(modelId);
+      } else {
+        model = deepseek(modelId);
+      }
+      break;
+
     default:
       throw new Error(
-        `Unknown AI provider: ${provider}. Supported providers: bedrock, openai, anthropic, google, azure, ollama, openrouter`
+        `Unknown AI provider: ${provider}. Supported providers: bedrock, openai, anthropic, google, azure, ollama, openrouter, deepseek`
       );
   }
 

package-lock.json

@@ -11,6 +11,7 @@
                 "@ai-sdk/amazon-bedrock": "^3.0.62",
                 "@ai-sdk/anthropic": "^2.0.44",
                 "@ai-sdk/azure": "^2.0.69",
+                "@ai-sdk/deepseek": "^1.0.30",
                 "@ai-sdk/google": "^2.0.0",
                 "@ai-sdk/openai": "^2.0.19",
                 "@ai-sdk/react": "^2.0.22",
@@ -155,6 +156,40 @@
                 "zod": "^3.25.76 || ^4.1.8"
             }
         },
+        "node_modules/@ai-sdk/deepseek": {
+            "version": "1.0.30",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/deepseek/-/deepseek-1.0.30.tgz",
+            "integrity": "sha512-pafNclW9L8Z3WimaRwlpHrGbdeaDE/UklT3rMi2aoRRyrA+s7zGcFuu1zbO2ViLNlKfaS91XZa9MFAPXbIftUA==",
+            "license": "Apache-2.0",
+            "dependencies": {
+                "@ai-sdk/openai-compatible": "1.0.28",
+                "@ai-sdk/provider": "2.0.0",
+                "@ai-sdk/provider-utils": "3.0.18"
+            },
+            "engines": {
+                "node": ">=18"
+            },
+            "peerDependencies": {
+                "zod": "^3.25.76 || ^4.1.8"
+            }
+        },
+        "node_modules/@ai-sdk/deepseek/node_modules/@ai-sdk/provider-utils": {
+            "version": "3.0.18",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/provider-utils/-/provider-utils-3.0.18.tgz",
+            "integrity": "sha512-ypv1xXMsgGcNKUP+hglKqtdDuMg68nWHucPPAhIENrbFAI+xCHiqPVN8Zllxyv1TNZwGWUghPxJXU+Mqps0YRQ==",
+            "license": "Apache-2.0",
+            "dependencies": {
+                "@ai-sdk/provider": "2.0.0",
+                "@standard-schema/spec": "^1.0.0",
+                "eventsource-parser": "^3.0.6"
+            },
+            "engines": {
+                "node": ">=18"
+            },
+            "peerDependencies": {
+                "zod": "^3.25.76 || ^4.1.8"
+            }
+        },
         "node_modules/@ai-sdk/gateway": {
             "version": "2.0.7",
             "resolved": "https://registry.npmjs.org/@ai-sdk/gateway/-/gateway-2.0.7.tgz",
@@ -231,6 +266,39 @@
                 "zod": "^3.25.76 || ^4.1.8"
             }
         },
+        "node_modules/@ai-sdk/openai-compatible": {
+            "version": "1.0.28",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/openai-compatible/-/openai-compatible-1.0.28.tgz",
+            "integrity": "sha512-yKubDxLYtXyGUzkr9lNStf/lE/I+Okc8tmotvyABhsQHHieLKk6oV5fJeRJxhr67Ejhg+FRnwUOxAmjRoFM4dA==",
+            "license": "Apache-2.0",
+            "dependencies": {
+                "@ai-sdk/provider": "2.0.0",
+                "@ai-sdk/provider-utils": "3.0.18"
+            },
+            "engines": {
+                "node": ">=18"
+            },
+            "peerDependencies": {
+                "zod": "^3.25.76 || ^4.1.8"
+            }
+        },
+        "node_modules/@ai-sdk/openai-compatible/node_modules/@ai-sdk/provider-utils": {
+            "version": "3.0.18",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/provider-utils/-/provider-utils-3.0.18.tgz",
+            "integrity": "sha512-ypv1xXMsgGcNKUP+hglKqtdDuMg68nWHucPPAhIENrbFAI+xCHiqPVN8Zllxyv1TNZwGWUghPxJXU+Mqps0YRQ==",
+            "license": "Apache-2.0",
+            "dependencies": {
+                "@ai-sdk/provider": "2.0.0",
+                "@standard-schema/spec": "^1.0.0",
+                "eventsource-parser": "^3.0.6"
+            },
+            "engines": {
+                "node": ">=18"
+            },
+            "peerDependencies": {
+                "zod": "^3.25.76 || ^4.1.8"
+            }
+        },
         "node_modules/@ai-sdk/openai/node_modules/@ai-sdk/provider-utils": {
             "version": "3.0.17",
             "resolved": "https://registry.npmjs.org/@ai-sdk/provider-utils/-/provider-utils-3.0.17.tgz",

package.json

@@ -12,6 +12,7 @@
         "@ai-sdk/amazon-bedrock": "^3.0.62",
         "@ai-sdk/anthropic": "^2.0.44",
         "@ai-sdk/azure": "^2.0.69",
+        "@ai-sdk/deepseek": "^1.0.30",
         "@ai-sdk/google": "^2.0.0",
         "@ai-sdk/openai": "^2.0.19",
         "@ai-sdk/react": "^2.0.22",