diff --git a/src/_locales/de/main.json b/src/_locales/de/main.json
index ad4a25d9..b3845deb 100644
--- a/src/_locales/de/main.json
+++ b/src/_locales/de/main.json
@@ -197,5 +197,7 @@
   "OpenAI (GPT-5.2)": "OpenAI (GPT-5.2)",
   "OpenAI (GPT-5.3 latest)": "OpenAI (GPT-5.3 latest)",
   "OpenAI (GPT-5.4)": "OpenAI (GPT-5.4)",
+  "OpenAI (GPT-5.4 mini)": "OpenAI (GPT-5.4 mini)",
+  "OpenAI (GPT-5.4 nano)": "OpenAI (GPT-5.4 nano)",
   "Anthropic (Claude Sonnet 4.6)": "Anthropic (Claude Sonnet 4.6)"
 }
diff --git a/src/_locales/en/main.json b/src/_locales/en/main.json
index 0bc75df8..a6f0d29e 100644
--- a/src/_locales/en/main.json
+++ b/src/_locales/en/main.json
@@ -198,5 +198,7 @@
   "OpenAI (GPT-5.2)": "OpenAI (GPT-5.2)",
   "OpenAI (GPT-5.3 latest)": "OpenAI (GPT-5.3 latest)",
   "OpenAI (GPT-5.4)": "OpenAI (GPT-5.4)",
+  "OpenAI (GPT-5.4 mini)": "OpenAI (GPT-5.4 mini)",
+  "OpenAI (GPT-5.4 nano)": "OpenAI (GPT-5.4 nano)",
   "Anthropic (Claude Sonnet 4.6)": "Anthropic (Claude Sonnet 4.6)"
 }
diff --git a/src/_locales/es/main.json b/src/_locales/es/main.json
index 4ea2c208..7f916a9c 100644
--- a/src/_locales/es/main.json
+++ b/src/_locales/es/main.json
@@ -197,5 +197,7 @@
   "OpenAI (GPT-5.2)": "OpenAI (GPT-5.2)",
   "OpenAI (GPT-5.3 latest)": "OpenAI (GPT-5.3 latest)",
   "OpenAI (GPT-5.4)": "OpenAI (GPT-5.4)",
+  "OpenAI (GPT-5.4 mini)": "OpenAI (GPT-5.4 mini)",
+  "OpenAI (GPT-5.4 nano)": "OpenAI (GPT-5.4 nano)",
   "Anthropic (Claude Sonnet 4.6)": "Anthropic (Claude Sonnet 4.6)"
 }
diff --git a/src/_locales/fr/main.json b/src/_locales/fr/main.json
index e718e2a7..c9341943 100644
--- a/src/_locales/fr/main.json
+++ b/src/_locales/fr/main.json
@@ -197,5 +197,7 @@
   "OpenAI (GPT-5.2)": "OpenAI (GPT-5.2)",
   "OpenAI (GPT-5.3 latest)": "OpenAI (GPT-5.3 latest)",
   "OpenAI (GPT-5.4)": "OpenAI (GPT-5.4)",
+  "OpenAI (GPT-5.4 mini)": "OpenAI (GPT-5.4 mini)",
+  "OpenAI (GPT-5.4 nano)": "OpenAI (GPT-5.4 nano)",
   "Anthropic (Claude Sonnet 4.6)": "Anthropic (Claude Sonnet 4.6)"
 }
diff --git a/src/_locales/in/main.json b/src/_locales/in/main.json
index 0e19c9f0..1fa5b7d9 100644
--- a/src/_locales/in/main.json
+++ b/src/_locales/in/main.json
@@ -197,5 +197,7 @@
   "OpenAI (GPT-5.2)": "OpenAI (GPT-5.2)",
   "OpenAI (GPT-5.3 latest)": "OpenAI (GPT-5.3 latest)",
   "OpenAI (GPT-5.4)": "OpenAI (GPT-5.4)",
+  "OpenAI (GPT-5.4 mini)": "OpenAI (GPT-5.4 mini)",
+  "OpenAI (GPT-5.4 nano)": "OpenAI (GPT-5.4 nano)",
   "Anthropic (Claude Sonnet 4.6)": "Anthropic (Claude Sonnet 4.6)"
 }
diff --git a/src/_locales/it/main.json b/src/_locales/it/main.json
index 60cf3f6d..400fa546 100644
--- a/src/_locales/it/main.json
+++ b/src/_locales/it/main.json
@@ -197,5 +197,7 @@
   "OpenAI (GPT-5.2)": "OpenAI (GPT-5.2)",
   "OpenAI (GPT-5.3 latest)": "OpenAI (GPT-5.3 latest)",
   "OpenAI (GPT-5.4)": "OpenAI (GPT-5.4)",
+  "OpenAI (GPT-5.4 mini)": "OpenAI (GPT-5.4 mini)",
+  "OpenAI (GPT-5.4 nano)": "OpenAI (GPT-5.4 nano)",
   "Anthropic (Claude Sonnet 4.6)": "Anthropic (Claude Sonnet 4.6)"
 }
diff --git a/src/_locales/ja/main.json b/src/_locales/ja/main.json
index 75010c90..ac19edc8 100644
--- a/src/_locales/ja/main.json
+++ b/src/_locales/ja/main.json
@@ -197,5 +197,7 @@
   "OpenAI (GPT-5.2)": "OpenAI (GPT-5.2)",
   "OpenAI (GPT-5.3 latest)": "OpenAI (GPT-5.3 latest)",
   "OpenAI (GPT-5.4)": "OpenAI (GPT-5.4)",
+  "OpenAI (GPT-5.4 mini)": "OpenAI (GPT-5.4 mini)",
+  "OpenAI (GPT-5.4 nano)": "OpenAI (GPT-5.4 nano)",
   "Anthropic (Claude Sonnet 4.6)": "Anthropic (Claude Sonnet 4.6)"
 }
diff --git a/src/_locales/ko/main.json b/src/_locales/ko/main.json
index 856614e4..4348a7c1 100644
--- a/src/_locales/ko/main.json
+++ b/src/_locales/ko/main.json
@@ -197,5 +197,7 @@
   "OpenAI (GPT-5.2)": "OpenAI (GPT-5.2)",
   "OpenAI (GPT-5.3 latest)": "OpenAI (GPT-5.3 latest)",
   "OpenAI (GPT-5.4)": "OpenAI (GPT-5.4)",
+  "OpenAI (GPT-5.4 mini)": "OpenAI (GPT-5.4 mini)",
+  "OpenAI (GPT-5.4 nano)": "OpenAI (GPT-5.4 nano)",
   "Anthropic (Claude Sonnet 4.6)": "Anthropic (Claude Sonnet 4.6)"
 }
diff --git a/src/_locales/pt/main.json b/src/_locales/pt/main.json
index c71da47b..d3a5bc56 100644
--- a/src/_locales/pt/main.json
+++ b/src/_locales/pt/main.json
@@ -197,5 +197,7 @@
   "OpenAI (GPT-5.2)": "OpenAI (GPT-5.2)",
   "OpenAI (GPT-5.3 latest)": "OpenAI (GPT-5.3 latest)",
   "OpenAI (GPT-5.4)": "OpenAI (GPT-5.4)",
+  "OpenAI (GPT-5.4 mini)": "OpenAI (GPT-5.4 mini)",
+  "OpenAI (GPT-5.4 nano)": "OpenAI (GPT-5.4 nano)",
   "Anthropic (Claude Sonnet 4.6)": "Anthropic (Claude Sonnet 4.6)"
 }
diff --git a/src/_locales/ru/main.json b/src/_locales/ru/main.json
index 45f233a5..b6852bbd 100644
--- a/src/_locales/ru/main.json
+++ b/src/_locales/ru/main.json
@@ -197,5 +197,7 @@
   "OpenAI (GPT-5.2)": "OpenAI (GPT-5.2)",
   "OpenAI (GPT-5.3 latest)": "OpenAI (GPT-5.3 latest)",
   "OpenAI (GPT-5.4)": "OpenAI (GPT-5.4)",
+  "OpenAI (GPT-5.4 mini)": "OpenAI (GPT-5.4 mini)",
+  "OpenAI (GPT-5.4 nano)": "OpenAI (GPT-5.4 nano)",
   "Anthropic (Claude Sonnet 4.6)": "Anthropic (Claude Sonnet 4.6)"
 }
diff --git a/src/_locales/tr/main.json b/src/_locales/tr/main.json
index 042879bc..4bf6bb9d 100644
--- a/src/_locales/tr/main.json
+++ b/src/_locales/tr/main.json
@@ -197,5 +197,7 @@
   "OpenAI (GPT-5.2)": "OpenAI (GPT-5.2)",
   "OpenAI (GPT-5.3 latest)": "OpenAI (GPT-5.3 latest)",
   "OpenAI (GPT-5.4)": "OpenAI (GPT-5.4)",
+  "OpenAI (GPT-5.4 mini)": "OpenAI (GPT-5.4 mini)",
+  "OpenAI (GPT-5.4 nano)": "OpenAI (GPT-5.4 nano)",
   "Anthropic (Claude Sonnet 4.6)": "Anthropic (Claude Sonnet 4.6)"
 }
diff --git a/src/_locales/zh-hans/main.json b/src/_locales/zh-hans/main.json
index 55d2446e..01c4299e 100644
--- a/src/_locales/zh-hans/main.json
+++ b/src/_locales/zh-hans/main.json
@@ -204,5 +204,7 @@
   "OpenAI (GPT-5.2)": "OpenAI (GPT-5.2)",
   "OpenAI (GPT-5.3 latest)": "OpenAI (GPT-5.3 latest)",
   "OpenAI (GPT-5.4)": "OpenAI (GPT-5.4)",
+  "OpenAI (GPT-5.4 mini)": "OpenAI (GPT-5.4 mini)",
+  "OpenAI (GPT-5.4 nano)": "OpenAI (GPT-5.4 nano)",
   "Anthropic (Claude Sonnet 4.6)": "Anthropic (Claude Sonnet 4.6)"
 }
diff --git a/src/_locales/zh-hant/main.json b/src/_locales/zh-hant/main.json
index e1c7c603..25686ca2 100644
--- a/src/_locales/zh-hant/main.json
+++ b/src/_locales/zh-hant/main.json
@@ -199,5 +199,7 @@
   "OpenAI (GPT-5.2)": "OpenAI (GPT-5.2)",
   "OpenAI (GPT-5.3 latest)": "OpenAI (GPT-5.3 latest)",
   "OpenAI (GPT-5.4)": "OpenAI (GPT-5.4)",
+  "OpenAI (GPT-5.4 mini)": "OpenAI (GPT-5.4 mini)",
+  "OpenAI (GPT-5.4 nano)": "OpenAI (GPT-5.4 nano)",
   "Anthropic (Claude Sonnet 4.6)": "Anthropic (Claude Sonnet 4.6)"
 }
diff --git a/src/config/index.mjs b/src/config/index.mjs
index d425b78b..cb1e0c3e 100644
--- a/src/config/index.mjs
+++ b/src/config/index.mjs
@@ -58,6 +58,8 @@ export const chatgptApiModelKeys = [
   'chatgptApi5_2',
   'chatgptApi5_3Latest',
   'chatgptApi5_4',
+  'chatgptApi5_4Mini',
+  'chatgptApi5_4Nano',
   'chatgptApi4oMini',
   'chatgptApi4_8k',
   'chatgptApi4_8k_0613',
@@ -260,6 +262,8 @@ export const Models = {
   chatgptApi5_2: { value: 'gpt-5.2', desc: 'OpenAI (GPT-5.2)' },
   chatgptApi5_3Latest: { value: 'gpt-5.3-chat-latest', desc: 'OpenAI (GPT-5.3 latest)' },
   chatgptApi5_4: { value: 'gpt-5.4', desc: 'OpenAI (GPT-5.4)' },
+  chatgptApi5_4Mini: { value: 'gpt-5.4-mini', desc: 'OpenAI (GPT-5.4 mini)' },
+  chatgptApi5_4Nano: { value: 'gpt-5.4-nano', desc: 'OpenAI (GPT-5.4 nano)' },
 
   chatgptApi4_1: { value: 'gpt-4.1', desc: 'OpenAI (GPT-4.1)' },
   chatgptApi4_1_mini: { value: 'gpt-4.1-mini', desc: 'OpenAI (GPT-4.1 mini)' },
diff --git a/tests/unit/config/config-predicates.test.mjs b/tests/unit/config/config-predicates.test.mjs
index f5dfae19..8ea2f9a6 100644
--- a/tests/unit/config/config-predicates.test.mjs
+++ b/tests/unit/config/config-predicates.test.mjs
@@ -34,6 +34,8 @@ const representativeChatgptApiModelNames = [
   'chatgptApi5_1',
   'chatgptApi5_2',
   'chatgptApi5_4',
+  'chatgptApi5_4Mini',
+  'chatgptApi5_4Nano',
 ]
 const representativeGptCompletionApiModelNames = ['gptApiInstruct']
 const representativeClaudeApiModelNames = ['claude37SonnetApi', 'claudeOpus4Api']
diff --git a/tests/unit/services/apis/openai-api-compat.test.mjs b/tests/unit/services/apis/openai-api-compat.test.mjs
index 89292f1b..39b89059 100644
--- a/tests/unit/services/apis/openai-api-compat.test.mjs
+++ b/tests/unit/services/apis/openai-api-compat.test.mjs
@@ -209,6 +209,76 @@ test('generateAnswersWithOpenAiApi uses OpenAI token params for a latest mapped
   assert.equal(Object.hasOwn(body, 'max_tokens'), false)
 })
 
+test('generateAnswersWithOpenAiApi uses max_completion_tokens for GPT-5.4 mini', async (t) => {
+  t.mock.method(console, 'debug', () => {})
+  setStorage({
+    customOpenAiApiUrl: 'https://api.openai.example.com',
+    maxConversationContextLength: 3,
+    maxResponseTokenLength: 444,
+    temperature: 0.3,
+  })
+
+  const session = {
+    modelName: 'chatgptApi5_4Mini',
+    conversationRecords: [],
+    isRetry: false,
+  }
+  const port = createFakePort()
+
+  let capturedInput
+  let capturedInit
+  t.mock.method(globalThis, 'fetch', async (input, init) => {
+    capturedInput = input
+    capturedInit = init
+    return createMockSseResponse([
+      'data: {"choices":[{"delta":{"content":"OK"},"finish_reason":"stop"}]}\n\n',
+    ])
+  })
+
+  await generateAnswersWithOpenAiApi(port, 'CurrentQ', session, 'sk-test')
+
+  const body = JSON.parse(capturedInit.body)
+  assert.equal(capturedInput, 'https://api.openai.example.com/v1/chat/completions')
+  assert.equal(body.model, 'gpt-5.4-mini')
+  assert.equal(body.max_completion_tokens, 444)
+  assert.equal(Object.hasOwn(body, 'max_tokens'), false)
+})
+
+test('generateAnswersWithOpenAiApi uses max_completion_tokens for GPT-5.4 nano', async (t) => {
+  t.mock.method(console, 'debug', () => {})
+  setStorage({
+    customOpenAiApiUrl: 'https://api.openai.example.com',
+    maxConversationContextLength: 3,
+    maxResponseTokenLength: 555,
+    temperature: 0.3,
+  })
+
+  const session = {
+    modelName: 'chatgptApi5_4Nano',
+    conversationRecords: [],
+    isRetry: false,
+  }
+  const port = createFakePort()
+
+  let capturedInput
+  let capturedInit
+  t.mock.method(globalThis, 'fetch', async (input, init) => {
+    capturedInput = input
+    capturedInit = init
+    return createMockSseResponse([
+      'data: {"choices":[{"delta":{"content":"OK"},"finish_reason":"stop"}]}\n\n',
+    ])
+  })
+
+  await generateAnswersWithOpenAiApi(port, 'CurrentQ', session, 'sk-test')
+
+  const body = JSON.parse(capturedInit.body)
+  assert.equal(capturedInput, 'https://api.openai.example.com/v1/chat/completions')
+  assert.equal(body.model, 'gpt-5.4-nano')
+  assert.equal(body.max_completion_tokens, 555)
+  assert.equal(Object.hasOwn(body, 'max_tokens'), false)
+})
+
 test('generateAnswersWithOpenAiApiCompat keeps max_tokens for latest mapped gpt-5 models in compat provider', async (t) => {
   t.mock.method(console, 'debug', () => {})
   setStorage({
diff --git a/tests/unit/services/apis/openai-token-params.test.mjs b/tests/unit/services/apis/openai-token-params.test.mjs
index 53913595..4c50a250 100644
--- a/tests/unit/services/apis/openai-token-params.test.mjs
+++ b/tests/unit/services/apis/openai-token-params.test.mjs
@@ -22,6 +22,8 @@ test('uses max_completion_tokens for recent gpt-5.x model names', () => {
     'gpt-5.2-chat-latest',
     'gpt-5.3',
     'gpt-5.3-chat-latest',
+    'gpt-5.4-mini',
+    'gpt-5.4-nano',
   ]
 
   for (const model of models) {
diff --git a/tests/unit/utils/model-name-convert.test.mjs b/tests/unit/utils/model-name-convert.test.mjs
index 73e00dbf..fb1fe488 100644
--- a/tests/unit/utils/model-name-convert.test.mjs
+++ b/tests/unit/utils/model-name-convert.test.mjs
@@ -123,6 +123,8 @@ test('modelNameToDesc returns desc for GPT-5 stable presets', () => {
   assert.equal(modelNameToDesc('chatgptApi5_1'), 'OpenAI (GPT-5.1)')
   assert.equal(modelNameToDesc('chatgptApi5_2'), 'OpenAI (GPT-5.2)')
   assert.equal(modelNameToDesc('chatgptApi5_4'), 'OpenAI (GPT-5.4)')
+  assert.equal(modelNameToDesc('chatgptApi5_4Mini'), 'OpenAI (GPT-5.4 mini)')
+  assert.equal(modelNameToDesc('chatgptApi5_4Nano'), 'OpenAI (GPT-5.4 nano)')
 })
 
 test('modelNameToDesc appends extraCustomModelName for customModel', () => {