fix: DeepSeek V4 compatibility in thinking mode

package.json

@@ -18,6 +18,7 @@
     "dev:profile:fast": "bun run scripts/provider-launch.ts auto --fast --bare",
     "dev:codex": "bun run scripts/provider-launch.ts codex",
     "dev:openai": "bun run scripts/provider-launch.ts openai",
+    "dev:deepseek": "bun run scripts/provider-launch.ts deepseek",
     "dev:gemini": "bun run scripts/provider-launch.ts gemini",
     "dev:ollama": "bun run scripts/provider-launch.ts ollama",
     "dev:ollama:fast": "bun run scripts/provider-launch.ts ollama --fast --bare",
@@ -26,6 +27,7 @@
     "profile:recommend": "bun run scripts/provider-recommend.ts",
     "profile:auto": "bun run scripts/provider-recommend.ts --apply",
     "profile:codex": "bun run profile:init -- --provider codex --model codexplan",
+    "profile:deepseek": "bun run profile:init -- --provider deepseek",
     "profile:fast": "bun run profile:init -- --provider ollama --model llama3.2:3b",
     "profile:code": "bun run profile:init -- --provider ollama --model qwen2.5-coder:7b",
     "dev:fast": "bun run profile:fast && bun run dev:ollama:fast",

scripts/provider-bootstrap.ts

@@ -10,6 +10,7 @@ import {
 import {
   buildAtomicChatProfileEnv,
   buildCodexProfileEnv,
+  buildDeepSeekProfileEnv,
   buildGeminiProfileEnv,
   buildMistralProfileEnv,
   buildOllamaProfileEnv,
@@ -38,7 +39,7 @@ function parseArg(name: string): string | null {
 
 function parseProviderArg(): ProviderProfile | 'auto' {
   const p = parseArg('--provider')?.toLowerCase()
-  if (p === 'openai' || p === 'ollama' || p === 'codex' || p === 'gemini' || p === 'mistral' || p === 'atomic-chat') return p
+  if (p === 'openai' || p === 'ollama' || p === 'codex' || p === 'gemini' || p === 'mistral' || p === 'deepseek' || p === 'atomic-chat') return p
   return 'auto'
 }
 
@@ -106,6 +107,21 @@ async function main(): Promise<void> {
       process.exit(1)
     }
 
+    env = builtEnv
+  } else if (selected === 'deepseek') {
+    const builtEnv = buildDeepSeekProfileEnv({
+      model: argModel || null,
+      baseUrl: argBaseUrl || null,
+      apiKey: argApiKey || null,
+      processEnv: process.env,
+    })
+
+    if (!builtEnv) {
+      console.error('DeepSeek profile requires an API key. Use --api-key or set DEEPSEEK_API_KEY/OPENAI_API_KEY.')
+      console.error('Get a key at: https://platform.deepseek.com/api_keys')
+      process.exit(1)
+    }
+
     env = builtEnv
   } else if (selected === 'ollama') {
     resolvedOllamaModel ??= await resolveOllamaModel(argModel, argBaseUrl, goal)

scripts/provider-launch.ts

@@ -50,7 +50,7 @@ function parseLaunchOptions(argv: string[]): LaunchOptions {
       continue
     }
 
-    if ((lower === 'auto' || lower === 'openai' || lower === 'ollama' || lower === 'codex' || lower === 'gemini' || lower ==='mistral' || lower === 'atomic-chat') && requestedProfile === 'auto') {
+    if ((lower === 'auto' || lower === 'openai' || lower === 'ollama' || lower === 'codex' || lower === 'gemini' || lower ==='mistral' || lower === 'deepseek' || lower === 'atomic-chat') && requestedProfile === 'auto') {
       requestedProfile = lower as ProviderProfile | 'auto'
       continue
     }
@@ -126,6 +126,8 @@ function printSummary(profile: ProviderProfile): void {
     console.log('Using configured Gemini provider settings.')
   } else if (profile === 'mistral') {
     console.log('Using configured Mistral provider settings.')
+  } else if (profile === 'deepseek') {
+    console.log('Using configured DeepSeek provider settings.')
   } else if (profile === 'codex') {
     console.log('Using configured Codex/OpenAI-compatible provider settings.')
   } else if (profile === 'atomic-chat') {
@@ -141,7 +143,7 @@ async function main(): Promise<void> {
   const options = parseLaunchOptions(process.argv.slice(2))
   const requestedProfile = options.requestedProfile
   if (!requestedProfile) {
-    console.error('Usage: bun run scripts/provider-launch.ts [openai|ollama|codex|gemini|mistral|atomic-chat|mistral|auto] [--fast] [--goal <latency|balanced|coding>] [-- <cli args>]')
+    console.error('Usage: bun run scripts/provider-launch.ts [openai|ollama|codex|gemini|mistral|deepseek|atomic-chat|auto] [--fast] [--goal <latency|balanced|coding>] [-- <cli args>]')
     process.exit(1)
   }
 
@@ -212,6 +214,11 @@ async function main(): Promise<void> {
     process.exit(1)
   }
 
+  if (profile === 'deepseek' && (!env.OPENAI_API_KEY || env.OPENAI_API_KEY === 'SUA_CHAVE')) {
+    console.error('DeepSeek profile requires a real API key. Run: bun run profile:init -- --provider deepseek --api-key <key>')
+    process.exit(1)
+  }
+
   if (profile === 'openai' && (!env.OPENAI_API_KEY || env.OPENAI_API_KEY === 'SUA_CHAVE')) {
     console.error('OPENAI_API_KEY is required for openai profile and cannot be SUA_CHAVE. Run: bun run profile:init -- --provider openai --api-key <key>')
     process.exit(1)

src/commands/provider/provider.tsx

@@ -30,6 +30,7 @@ import {
   applySavedProfileToCurrentSession as applySharedProfileToCurrentSession,
   buildCodexOAuthProfileEnv as buildSharedCodexOAuthProfileEnv,
   buildCodexProfileEnv,
+  buildDeepSeekProfileEnv,
   buildGeminiProfileEnv,
   buildMistralProfileEnv,
   buildOllamaProfileEnv,
@@ -39,6 +40,8 @@ import {
   DEFAULT_GEMINI_MODEL,
   DEFAULT_MISTRAL_BASE_URL,
   DEFAULT_MISTRAL_MODEL,
+  DEFAULT_DEEPSEEK_BASE_URL,
+  DEFAULT_DEEPSEEK_MODEL,
   deleteProfileFile,
   loadProfileFile,
   maskSecretForDisplay,
@@ -137,6 +140,8 @@ type Step =
   | { name: 'auto-goal' }
   | { name: 'auto-detect'; goal: RecommendationGoal }
   | { name: 'ollama-detect' }
+  | { name: 'deepseek-key' }
+  | { name: 'deepseek-model'; apiKey: string }
   | { name: 'openai-key'; defaultModel: string }
   | { name: 'openai-base'; apiKey: string; defaultModel: string }
   | {
@@ -315,6 +320,8 @@ export function buildCurrentProviderSummary(options?: {
       providerLabel = 'Codex'
     } else if (isLocalProviderUrl(request.baseUrl)) {
       providerLabel = getLocalOpenAICompatibleProviderLabel(request.baseUrl)
+    } else if (/api\.deepseek\.com/i.test(request.baseUrl)) {
+      providerLabel = 'DeepSeek V4'
     }
 
     return {
@@ -404,6 +411,25 @@ function buildSavedProfileSummary(
             ? 'configured'
             : undefined,
       }
+    case 'deepseek':
+      return {
+        providerLabel: 'DeepSeek V4',
+        modelLabel: getSafeDisplayValue(
+          env.OPENAI_MODEL ?? DEFAULT_DEEPSEEK_MODEL,
+          process.env,
+          env,
+        ),
+        endpointLabel: getSafeDisplayValue(
+          env.OPENAI_BASE_URL ?? DEFAULT_DEEPSEEK_BASE_URL,
+          process.env,
+          env,
+        ),
+        credentialLabel:
+          maskSecretForDisplay(env.OPENAI_API_KEY) !== undefined ||
+          maskSecretForDisplay(env.DEEPSEEK_API_KEY) !== undefined
+            ? 'configured'
+            : undefined,
+      }
     case 'ollama':
       return {
         providerLabel: 'Ollama',
@@ -482,8 +508,8 @@ export function buildProfileSaveMessage(
 function buildUsageText(): string {
   const summary = buildCurrentProviderSummary()
   const availableProviders = isBareMode()
-    ? 'Choose Auto, Ollama, OpenAI-compatible, Gemini, or Codex, then save a provider profile.'
-    : 'Choose Auto, Ollama, OpenAI-compatible, Gemini, Codex, or Codex OAuth, then save a provider profile.'
+    ? 'Choose Auto, Ollama, DeepSeek V4, OpenAI-compatible, Gemini, or Codex, then save a provider profile.'
+    : 'Choose Auto, Ollama, DeepSeek V4, OpenAI-compatible, Gemini, Codex, or Codex OAuth, then save a provider profile.'
   return [
     'Usage: /provider',
     '',
@@ -645,7 +671,12 @@ function ProviderChooser({
       label: 'OpenAI-compatible',
       value: 'openai',
       description:
-        'GPT-4o, DeepSeek, OpenRouter, Groq, LM Studio, and similar APIs',
+        'GPT-4o, OpenRouter, Groq, LM Studio, and similar APIs',
+    },
+    {
+      label: 'DeepSeek V4',
+      value: 'deepseek',
+      description: 'Use DeepSeek V4 Pro thinking mode with the official API',
     },
     {
       label: 'Gemini',
@@ -1252,6 +1283,8 @@ export function ProviderWizard({
                 name: 'openai-key',
                 defaultModel: defaults.openAIModel,
               })
+            } else if (value === 'deepseek') {
+              setStep({ name: 'deepseek-key' })
             } else if (value === 'gemini') {
               setStep({ name: 'gemini-auth-method' })
             } else if (value === 'mistral') {
@@ -1304,6 +1337,67 @@ export function ProviderWizard({
         />
       )
 
+    case 'deepseek-key':
+      return (
+        <TextEntryDialog
+          resetStateKey={step.name}
+          title="DeepSeek V4 setup"
+          subtitle="Step 1 of 2"
+          description={
+            process.env.DEEPSEEK_API_KEY || process.env.OPENAI_API_KEY
+              ? 'Enter a DeepSeek API key, or leave this blank to reuse the current DEEPSEEK_API_KEY/OPENAI_API_KEY from this session.'
+              : 'Enter your DeepSeek API key.'
+          }
+          initialValue=""
+          placeholder="sk-..."
+          mask="*"
+          allowEmpty={Boolean(process.env.DEEPSEEK_API_KEY || process.env.OPENAI_API_KEY)}
+          validate={value => {
+            const candidate =
+              value.trim() ||
+              process.env.DEEPSEEK_API_KEY ||
+              process.env.OPENAI_API_KEY ||
+              ''
+            return sanitizeApiKey(candidate)
+              ? null
+              : 'Enter a real DeepSeek API key.'
+          }}
+          onSubmit={value => {
+            const apiKey =
+              value.trim() ||
+              process.env.DEEPSEEK_API_KEY ||
+              process.env.OPENAI_API_KEY ||
+              ''
+            setStep({ name: 'deepseek-model', apiKey })
+          }}
+          onCancel={() => setStep({ name: 'choose' })}
+        />
+      )
+
+    case 'deepseek-model':
+      return (
+        <TextEntryDialog
+          resetStateKey={step.name}
+          title="DeepSeek V4 setup"
+          subtitle="Step 2 of 2"
+          description={`Enter a model name. Leave blank for ${DEFAULT_DEEPSEEK_MODEL}.`}
+          initialValue={DEFAULT_DEEPSEEK_MODEL}
+          placeholder={DEFAULT_DEEPSEEK_MODEL}
+          allowEmpty
+          onSubmit={value => {
+            const env = buildDeepSeekProfileEnv({
+              apiKey: step.apiKey,
+              model: value.trim() || DEFAULT_DEEPSEEK_MODEL,
+              processEnv: {},
+            })
+            if (env) {
+              finishProfileSave(onDone, 'deepseek', env)
+            }
+          }}
+          onCancel={() => setStep({ name: 'deepseek-key' })}
+        />
+      )
+
     case 'openai-key':
       return (
         <TextEntryDialog

src/components/ProviderManager.test.tsx

@@ -112,7 +112,7 @@ const PRESET_ORDER = [
   'Azure OpenAI',
   'Bankr',
   'Codex OAuth',
-  'DeepSeek',
+  'DeepSeek V4',
   'Google Gemini',
   'Groq',
   'LM Studio',

src/components/ProviderManager.tsx

@@ -1364,8 +1364,8 @@ export function ProviderManager({ mode, onDone }: Props): React.ReactNode {
         : []),
       {
         value: 'deepseek',
-        label: 'DeepSeek',
-        description: 'DeepSeek OpenAI-compatible endpoint',
+        label: 'DeepSeek V4',
+        description: 'DeepSeek V4 OpenAI-compatible endpoint',
       },
       {
         value: 'gemini',

src/main.tsx

@@ -984,7 +984,7 @@ async function run(): Promise<CommanderCommand> {
     return Number.isFinite(n) ? n : undefined;
   }).hideHelp()).option('--from-pr [value]', 'Resume a session linked to a PR by PR number/URL, or open interactive picker with optional search term', value => value || true).option('--no-session-persistence', 'Disable session persistence - sessions will not be saved to disk and cannot be resumed (only works with --print)').addOption(new Option('--resume-session-at <message id>', 'When resuming, only messages up to and including the assistant message with <message.id> (use with --resume in print mode)').argParser(String).hideHelp()).addOption(new Option('--rewind-files <user-message-id>', 'Restore files to state at the specified user message and exit (requires --resume)').hideHelp())
   // @[MODEL LAUNCH]: Update the example model ID in the --model help text.
-  .option('--model <model>', `Model for the current session. Provide an alias for the latest model (e.g. 'sonnet' or 'opus') or a model's full name (e.g. 'claude-sonnet-4-6').`).option('--provider <provider>', `AI provider to use (anthropic, openai, gemini, github, bedrock, vertex, ollama). Reads API keys from environment variables.`).addOption(new Option('--effort <level>', `Effort level for the current session (low, medium, high, max)`).argParser((rawValue: string) => {
+  .option('--model <model>', `Model for the current session. Provide an alias for the latest model (e.g. 'sonnet' or 'opus') or a model's full name (e.g. 'claude-sonnet-4-6').`).option('--provider <provider>', `AI provider to use (anthropic, openai, deepseek, gemini, github, bedrock, vertex, ollama). Reads API keys from environment variables.`).addOption(new Option('--effort <level>', `Effort level for the current session (low, medium, high, max)`).argParser((rawValue: string) => {
     const value = rawValue.toLowerCase();
     const allowed = ['low', 'medium', 'high', 'max'];
     if (!allowed.includes(value)) {