From e1bad514b7e85a898b629ce3d2c52a7667b647af Mon Sep 17 00:00:00 2001
From: Peter Dave Hello <3691490+PeterDaveHello@users.noreply.github.com>
Date: Wed, 23 Sep 2026 03:08:21 +0800
Subject: [PATCH] Add Anthropic Claude Opus 5.5 API support

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

Keep Opus 5.5 on its required adaptive thinking behavior by leaving the
`thinking` field unset, and omit unsupported custom temperature values.

Extend Claude request-shaping and temperature normalization coverage.

References:
- https://www.anthropic.com/claude-opus-5-5
- https://platform.claude.com/docs/en/models/opus-5-5/whats-new-opus-5-5
- https://platform.claude.com/docs/en/build-with-claude/preserved-thinking
- https://platform.claude.com/docs/en/claude_api_primer
---
 src/_locales/en/main.json                            | 1 +
 src/config/index.mjs                                 | 7 ++++++-
 src/services/apis/temperature-params.mjs             | 1 +
 tests/unit/services/apis/claude-api.test.mjs         | 1 +
 tests/unit/services/apis/temperature-params.test.mjs | 2 ++
 5 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/_locales/en/main.json b/src/_locales/en/main.json
index 445148a56..303721fdf 100644
--- a/src/_locales/en/main.json
+++ b/src/_locales/en/main.json
@@ -205,6 +205,7 @@
   "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 Opus 5.5)": "Anthropic (Claude Opus 5.5)",
   "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 6267ef67c..87309080f 100644
--- a/src/config/index.mjs
+++ b/src/config/index.mjs
@@ -97,6 +97,7 @@ export const claudeApiModelKeys = [
   'claudeOpus47Api',
   'claudeOpus48Api',
   'claudeOpus5Api',
+  'claudeOpus55Api',
   'claudeSonnet45Api',
   'claudeSonnet46Api',
   'claudeSonnet5Api',
@@ -372,6 +373,10 @@ export const Models = {
     value: 'claude-opus-5',
     desc: 'Anthropic (Claude Opus 5)',
   },
+  claudeOpus55Api: {
+    value: 'claude-opus-5-5',
+    desc: 'Anthropic (Claude Opus 5.5)',
+  },
   claudeSonnet45Api: {
     value: 'claude-sonnet-4-5-20250929',
     desc: 'Anthropic (Claude Sonnet 4.5)',
@@ -767,7 +772,7 @@ export const defaultApiModeIds = [
   'xaiGrok4_6',
   'xaiGrok4_5',
   'claudeFable51Api',
-  'claudeOpus5Api',
+  'claudeOpus55Api',
   'claudeSonnet5Api',
   'claudeHaiku45Api',
   'googleGemini3_1Pro',
diff --git a/src/services/apis/temperature-params.mjs b/src/services/apis/temperature-params.mjs
index f586ab0fa..42357b992 100644
--- a/src/services/apis/temperature-params.mjs
+++ b/src/services/apis/temperature-params.mjs
@@ -3,6 +3,7 @@ const MODELS_WITHOUT_CUSTOM_TEMPERATURE = new Set([
   'claude-opus-4-8',
   'claude-sonnet-5',
   'claude-opus-5',
+  'claude-opus-5-5',
   'claude-fable-5',
   'claude-fable-5-1',
   'gpt-6-astra',
diff --git a/tests/unit/services/apis/claude-api.test.mjs b/tests/unit/services/apis/claude-api.test.mjs
index 790a962e6..c416dbc23 100644
--- a/tests/unit/services/apis/claude-api.test.mjs
+++ b/tests/unit/services/apis/claude-api.test.mjs
@@ -183,6 +183,7 @@ test('claude-api: omits temperature for models that reject custom sampling', asy
     ['claudeOpus47Api', 'claude-opus-4-7'],
     ['claudeOpus48Api', 'claude-opus-4-8'],
     ['claudeOpus5Api', 'claude-opus-5'],
+    ['claudeOpus55Api', 'claude-opus-5-5'],
     ['claudeSonnet5Api', 'claude-sonnet-5'],
   ]) {
     await t.test(modelName, async (t) => {
diff --git a/tests/unit/services/apis/temperature-params.test.mjs b/tests/unit/services/apis/temperature-params.test.mjs
index ff72cf33c..93a295e13 100644
--- a/tests/unit/services/apis/temperature-params.test.mjs
+++ b/tests/unit/services/apis/temperature-params.test.mjs
@@ -35,6 +35,8 @@ test('temperature overrides omit known Anthropic models across provider ID forma
     'claude-opus-4-8-20260801',
     'claude-sonnet-5',
     'claude-opus-5',
+    'claude-opus-5-5',
+    'anthropic/claude-opus-5.5',
     'claude-fable-5',
     'claude-fable-5-1',
     'anthropic/claude-fable-5.1',