diff --git a/src/background/index.mjs b/src/background/index.mjs
index 89a1ea048..3bfb39da4 100644
--- a/src/background/index.mjs
+++ b/src/background/index.mjs
@@ -26,6 +26,7 @@ import {
   isUsingGeminiWebModel,
   isUsingClaudeWebModel,
   isUsingMoonshotApiModel,
+  isUsingMistralApiModel,
   isUsingMoonshotWebModel,
   isUsingOpenRouterApiModel,
   isUsingAimlApiModel,
@@ -396,6 +397,7 @@ function isUsingOpenAICompatibleApiSession(session) {
     isUsingCustomModel(session) ||
     isUsingChatgptApiModel(session) ||
     isUsingMoonshotApiModel(session) ||
+    isUsingMistralApiModel(session) ||
     isUsingChatGLMApiModel(session) ||
     isUsingDeepSeekApiModel(session) ||
     isUsingOllamaApiModel(session) ||
diff --git a/src/config/index.mjs b/src/config/index.mjs
index e1a22f822..d2b09516d 100644
--- a/src/config/index.mjs
+++ b/src/config/index.mjs
@@ -123,6 +123,11 @@ export const moonshotApiModelKeys = [
   'moonshot_v1_32k',
   'moonshot_v1_128k',
 ]
+export const mistralApiModelKeys = [
+  'mistralMediumLatest',
+  'mistralSmallLatest',
+  'mistralLargeLatest',
+]
 export const deepSeekApiModelKeys = [
   'deepseek_chat',
   'deepseek_reasoner',
@@ -229,6 +234,10 @@ export const ModelGroups = {
     value: moonshotApiModelKeys,
     desc: 'Kimi.Moonshot (API)',
   },
+  mistralApiModelKeys: {
+    value: mistralApiModelKeys,
+    desc: 'Mistral AI (API)',
+  },
   chatglmApiModelKeys: {
     value: chatglmApiModelKeys,
     desc: 'ChatGLM (API)',
@@ -433,6 +442,19 @@ export const Models = {
     desc: 'DeepSeek (Reasoner)',
   },
 
+  mistralMediumLatest: {
+    value: 'mistral-medium-latest',
+    desc: 'Mistral AI (Medium latest)',
+  },
+  mistralSmallLatest: {
+    value: 'mistral-small-latest',
+    desc: 'Mistral AI (Small latest)',
+  },
+  mistralLargeLatest: {
+    value: 'mistral-large-latest',
+    desc: 'Mistral AI (Large latest)',
+  },
+
   openRouter_anthropic_claude_haiku4_5: {
     value: 'anthropic/claude-haiku-4.5',
     desc: 'OpenRouter (Claude Haiku 4.5)',
@@ -691,6 +713,7 @@ export const defaultConfig = {
   anthropicApiKey: '',
   chatglmApiKey: '',
   moonshotApiKey: '',
+  mistralApiKey: '',
   deepSeekApiKey: '',
 
   customApiKey: '',
@@ -750,6 +773,7 @@ export const defaultConfig = {
     'claudeHaiku45Api',
     'googleGemini3_1Pro',
     'googleGemini3_5Flash',
+    'mistralMediumLatest',
     'openRouter_auto',
     'openRouter_free',
   ],
@@ -895,6 +919,10 @@ export function isUsingMoonshotApiModel(configOrSession) {
   return isInApiModeGroup(moonshotApiModelKeys, configOrSession)
 }
 
+export function isUsingMistralApiModel(configOrSession) {
+  return isInApiModeGroup(mistralApiModelKeys, configOrSession)
+}
+
 export function isUsingDeepSeekApiModel(configOrSession) {
   return isInApiModeGroup(deepSeekApiModelKeys, configOrSession)
 }
diff --git a/src/config/openai-provider-mappings.mjs b/src/config/openai-provider-mappings.mjs
index 57c0485a3..1e2f7e7c2 100644
--- a/src/config/openai-provider-mappings.mjs
+++ b/src/config/openai-provider-mappings.mjs
@@ -2,6 +2,7 @@ export const LEGACY_API_KEY_FIELD_BY_PROVIDER_ID = {
   openai: 'apiKey',
   deepseek: 'deepSeekApiKey',
   moonshot: 'moonshotApiKey',
+  mistral: 'mistralApiKey',
   openrouter: 'openRouterApiKey',
   aiml: 'aimlApiKey',
   chatglm: 'chatglmApiKey',
@@ -21,6 +22,7 @@ export const OPENAI_COMPATIBLE_GROUP_TO_PROVIDER_ID = {
   chatgptApiModelKeys: 'openai',
   gptApiModelKeys: 'openai',
   moonshotApiModelKeys: 'moonshot',
+  mistralApiModelKeys: 'mistral',
   deepSeekApiModelKeys: 'deepseek',
   openRouterApiModelKeys: 'openrouter',
   aimlModelKeys: 'aiml',
diff --git a/src/popup/sections/GeneralPart.jsx b/src/popup/sections/GeneralPart.jsx
index bf1798b89..066ffb156 100644
--- a/src/popup/sections/GeneralPart.jsx
+++ b/src/popup/sections/GeneralPart.jsx
@@ -62,6 +62,8 @@ function getProviderApiKeySetupUrl(providerId) {
       return 'https://platform.openai.com/account/api-keys'
     case 'moonshot':
       return 'https://platform.moonshot.cn/console/api-keys'
+    case 'mistral':
+      return 'https://console.mistral.ai/api-keys'
     default:
       return ''
   }
diff --git a/src/services/apis/provider-registry.mjs b/src/services/apis/provider-registry.mjs
index 72aa47662..c0e18403f 100644
--- a/src/services/apis/provider-registry.mjs
+++ b/src/services/apis/provider-registry.mjs
@@ -35,6 +35,14 @@ const BUILTIN_PROVIDER_TEMPLATE = [
     builtin: true,
     enabled: true,
   },
+  {
+    id: 'mistral',
+    name: 'Mistral AI',
+    baseUrl: 'https://api.mistral.ai/v1',
+    chatCompletionsPath: '/chat/completions',
+    builtin: true,
+    enabled: true,
+  },
   {
     id: 'openrouter',
     name: 'OpenRouter',
@@ -111,6 +119,8 @@ function resolveProviderIdFromLegacyModelName(modelName) {
   }
   if (preset.startsWith('deepseek_') || preset === 'deepSeekApiModelKeys') return 'deepseek'
   if (preset.startsWith('moonshot_') || preset === 'moonshotApiModelKeys') return 'moonshot'
+  if (/^mistral(?:Medium|Small|Large)/.test(preset) || preset === 'mistralApiModelKeys')
+    return 'mistral'
   if (preset.startsWith('openRouter_') || preset === 'openRouterApiModelKeys') return 'openrouter'
   if (preset.startsWith('aiml_') || preset === 'aimlModelKeys' || preset === 'aimlApiModelKeys') {
     return 'aiml'
diff --git a/tests/unit/config/config-predicates.test.mjs b/tests/unit/config/config-predicates.test.mjs
index a899f31df..6aff7c722 100644
--- a/tests/unit/config/config-predicates.test.mjs
+++ b/tests/unit/config/config-predicates.test.mjs
@@ -7,6 +7,7 @@ import {
   chatgptApiModelKeys,
   gptApiModelKeys,
   claudeApiModelKeys,
+  mistralApiModelKeys,
   openRouterApiModelKeys,
   aimlApiModelKeys,
   isUsingAimlApiModel,
@@ -22,6 +23,7 @@ import {
   isUsingGeminiWebModel,
   isUsingGithubThirdPartyApiModel,
   isUsingMoonshotApiModel,
+  isUsingMistralApiModel,
   isUsingMoonshotWebModel,
   isUsingMultiModeModel,
   isUsingOllamaApiModel,
@@ -223,6 +225,13 @@ test('isUsingMoonshotApiModel detects moonshot API models', () => {
   assert.equal(isUsingMoonshotApiModel({ modelName: 'moonshotWebFree' }), false)
 })
 
+test('isUsingMistralApiModel accepts exported Mistral API model keys', () => {
+  for (const modelName of mistralApiModelKeys) {
+    assert.equal(isUsingMistralApiModel({ modelName }), true)
+  }
+  assert.equal(isUsingMistralApiModel({ modelName: 'chatgptApi4oMini' }), false)
+})
+
 test('isUsingDeepSeekApiModel detects DeepSeek models', () => {
   assert.equal(isUsingDeepSeekApiModel({ modelName: 'deepseek_v4_flash' }), true)
   assert.equal(isUsingDeepSeekApiModel({ modelName: 'deepseek_v4_pro' }), true)
diff --git a/tests/unit/services/apis/provider-registry.test.mjs b/tests/unit/services/apis/provider-registry.test.mjs
index 29d949814..399834447 100644
--- a/tests/unit/services/apis/provider-registry.test.mjs
+++ b/tests/unit/services/apis/provider-registry.test.mjs
@@ -41,6 +41,11 @@ test('resolveEndpointTypeForSession falls back to legacy modelName when apiMode
   assert.equal(resolveEndpointTypeForSession(session), 'completion')
 })
 
+test('resolveProviderIdForSession resolves legacy Mistral preset keys', () => {
+  assert.equal(resolveProviderIdForSession({ modelName: 'mistralMediumLatest' }), 'mistral')
+  assert.equal(resolveProviderIdForSession({ modelName: 'mistralApiModelKeys-custom' }), 'mistral')
+})
+
 test('resolveProviderIdForSession resolves legacy Google preset keys', () => {
   assert.equal(resolveProviderIdForSession({ modelName: 'googleGemini2_5Flash' }), 'google')
   assert.equal(resolveProviderIdForSession({ modelName: 'googleApiModelKeys-custom' }), 'google')
diff --git a/tests/unit/services/apis/thin-adapters.test.mjs b/tests/unit/services/apis/thin-adapters.test.mjs
index 385fd25f7..40c0c3e9f 100644
--- a/tests/unit/services/apis/thin-adapters.test.mjs
+++ b/tests/unit/services/apis/thin-adapters.test.mjs
@@ -49,6 +49,13 @@ const adapters = [
     expectedBaseUrl: 'https://api.moonshot.cn/v1',
     expectedApiKey: 'ms-key',
   },
+  {
+    name: 'mistral-api',
+    apiMode: { groupName: 'mistralApiModelKeys', itemName: 'mistralMediumLatest' },
+    providerId: 'mistral',
+    expectedBaseUrl: 'https://api.mistral.ai/v1',
+    expectedApiKey: 'mistral-key',
+  },
   {
     name: 'openrouter-api',
     apiMode: { groupName: 'openRouterApiModelKeys', itemName: 'openRouter_openai_o3' },