From 37aabfd4095018e6e1b755c6cba62d3c1f9348ee Mon Sep 17 00:00:00 2001
From: Peter Dave Hello <hsu@peterdavehello.org>
Date: Sun, 26 Jul 2026 03:31:25 +0800
Subject: [PATCH] Add Anthropic Claude Opus 5 API support

Register `claude-opus-5` as the default Opus API preset while keeping
Claude Opus 4.8 available as a separate selectable model.

Let Opus 5 use its default adaptive thinking behavior and omit the
unsupported custom temperature parameter.

Add request-shaping regression coverage.

References:
- https://www.anthropic.com/claude-opus-5-system-card
- https://www.anthropic.com/news/claude-opus-5
- https://platform.claude.com/docs/en/about-claude/models/overview
- https://platform.claude.com/docs/en/about-claude/models/whats-new-opus-5
---
 src/_locales/en/main.json                    | 1 +
 src/config/index.mjs                         | 7 ++++++-
 src/services/apis/claude-api.mjs             | 7 ++++++-
 tests/unit/services/apis/claude-api.test.mjs | 1 +
 4 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/_locales/en/main.json b/src/_locales/en/main.json
index 629bc7a15..5f1428218 100644
--- a/src/_locales/en/main.json
+++ b/src/_locales/en/main.json
@@ -195,6 +195,7 @@
   "Anthropic (Claude Opus 4.5)": "Anthropic (Claude Opus 4.5)",
   "Anthropic (Claude Opus 4.6)": "Anthropic (Claude Opus 4.6)",
   "Anthropic (Claude Opus 4.8)": "Anthropic (Claude Opus 4.8)",
+  "Anthropic (Claude Opus 5)": "Anthropic (Claude Opus 5)",
   "Anthropic (Claude Sonnet 4)": "Anthropic (Claude Sonnet 4)",
   "Anthropic (Claude Sonnet 4.5)": "Anthropic (Claude Sonnet 4.5)",
   "Anthropic (Claude Haiku 4.5)": "Anthropic (Claude Haiku 4.5)",
diff --git a/src/config/index.mjs b/src/config/index.mjs
index 22b64df31..c4659af0b 100644
--- a/src/config/index.mjs
+++ b/src/config/index.mjs
@@ -91,6 +91,7 @@ export const claudeApiModelKeys = [
   'claudeOpus46Api',
   'claudeOpus47Api',
   'claudeOpus48Api',
+  'claudeOpus5Api',
   'claudeSonnet45Api',
   'claudeSonnet46Api',
   'claudeSonnet5Api',
@@ -364,6 +365,10 @@ export const Models = {
     value: 'claude-opus-4-8',
     desc: 'Anthropic (Claude Opus 4.8)',
   },
+  claudeOpus5Api: {
+    value: 'claude-opus-5',
+    desc: 'Anthropic (Claude Opus 5)',
+  },
   claudeSonnet45Api: {
     value: 'claude-sonnet-4-5-20250929',
     desc: 'Anthropic (Claude Sonnet 4.5)',
@@ -750,7 +755,7 @@ export const defaultApiModeIds = [
   'chatgptApi5_6Terra',
   'chatgptApi5_6Luna',
   'xaiGrok4_5',
-  'claudeOpus48Api',
+  'claudeOpus5Api',
   'claudeSonnet5Api',
   'claudeHaiku45Api',
   'googleGemini3_1Pro',
diff --git a/src/services/apis/claude-api.mjs b/src/services/apis/claude-api.mjs
index 341a4dd9d..0f15680df 100644
--- a/src/services/apis/claude-api.mjs
+++ b/src/services/apis/claude-api.mjs
@@ -6,7 +6,12 @@ import { getConversationPairs } from '../../utils/get-conversation-pairs.mjs'
 import { getModelValue } from '../../utils/model-name-convert.mjs'
 
 function shouldOmitTemperature(model) {
-  return model === 'claude-opus-4-7' || model === 'claude-opus-4-8' || model === 'claude-sonnet-5'
+  return (
+    model === 'claude-opus-4-7' ||
+    model === 'claude-opus-4-8' ||
+    model === 'claude-sonnet-5' ||
+    model === 'claude-opus-5'
+  )
 }
 
 function shouldDisableDefaultThinking(model) {
diff --git a/tests/unit/services/apis/claude-api.test.mjs b/tests/unit/services/apis/claude-api.test.mjs
index 64684e97d..88e44ad26 100644
--- a/tests/unit/services/apis/claude-api.test.mjs
+++ b/tests/unit/services/apis/claude-api.test.mjs
@@ -125,6 +125,7 @@ test('claude-api: omits temperature for models that reject custom sampling', asy
   for (const [modelName, model] of [
     ['claudeOpus47Api', 'claude-opus-4-7'],
     ['claudeOpus48Api', 'claude-opus-4-8'],
+    ['claudeOpus5Api', 'claude-opus-5'],
     ['claudeSonnet5Api', 'claude-sonnet-5'],
   ]) {
     await t.test(modelName, async (t) => {