Add Anthropic Claude Opus 5.5 API support

[PeterDaveHello]

Expose Claude Opus 5.5 through the Anthropic API model list using the official claude-opus-5-5 identifier.

Changes

• Register Claude Opus 5.5 as a selectable Anthropic API model.
• Make Claude Opus 5.5 the default Opus-tier API option while keeping Claude Opus 5 selectable.
• Keep Opus 5.5 on its required adaptive thinking behavior by leaving the thinking field unset.
• Omit unsupported custom temperature overrides for Claude Opus 5.5.
• Extend Claude request-shaping and shared temperature regression coverage, including provider-qualified model-ID normalization.

Localization

• Add the English i18n locale entry for Anthropic (Claude Opus 5.5).
• Other locales continue to use the existing English fallback behavior for untranslated model labels.

Compatibility notes

• Opus 5.5 does not support disabling thinking or legacy manually budgeted thinking. The direct Claude path only explicitly disables thinking for Sonnet 5, so Opus 5.5 correctly leaves thinking unset.
• The existing direct Anthropic integration does not resend prior thinking blocks. This remains unchanged and keeps the model-support change scoped to the existing conversation-history behavior.

Validation

• One commit on the current master base.
• 5 files changed, 11 additions, 1 deletion.
• Regression coverage includes model resolution, omitted unsupported temperature, unset thinking, and anthropic/claude-opus-5.5 normalization.

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

Summary by CodeRabbit

• New Features

  • Added support for the Anthropic Claude Opus 5.5 model.
  • Claude Opus 5.5 is now included among the default API modes.

• Bug Fixes

  • Prevented unsupported temperature overrides from being sent when using Claude Opus 5.5.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 5a3478ca-8dbb-426a-9b6d-0fa6d5bd2e2f

📥 Commits

Reviewing files that changed from the base of the PR and between 12db6b8 and e1bad51.

📒 Files selected for processing (5)

• src/_locales/en/main.json
• src/config/index.mjs
• src/services/apis/temperature-params.mjs
• tests/unit/services/apis/claude-api.test.mjs
• tests/unit/services/apis/temperature-params.test.mjs

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📝 Walkthrough

Walkthrough

The change adds Claude Opus 5.5 to model configuration and localization, makes it a default API mode, excludes it from custom temperature overrides, and adds test coverage for these behaviors.

Changes

Claude Opus 5.5 support

Layer / File(s)	Summary
Model registration and default selection src/config/index.mjs, src/_locales/en/main.json	Registers claudeOpus55Api with API value claude-opus-5-5, adds its English description, and replaces claudeOpus5Api in the default API mode list.
Temperature handling and request validation src/services/apis/temperature-params.mjs, tests/unit/services/apis/claude-api.test.mjs, tests/unit/services/apis/temperature-params.test.mjs	Excludes Claude Opus 5.5 from custom temperature overrides. Tests verify that requests omit temperature and that both supported model identifiers reject temperature parameters.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to e1bad

Claude Opus 5.5 is registered and safely selected as the default, with unsupported temperature overrides omitted.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding Anthropic Claude Opus 5.5 API support.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 4…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[qodo-code-review]

PR Summary by Qodo

Add Claude Opus 5.5 Anthropic API support

✨ Enhancement 🧪 Tests 🕐 10-20 Minutes

AI Description

• Registers Claude Opus 5.5 and promotes it as the default Opus API preset.
• Preserves adaptive thinking and omits unsupported temperature overrides for direct Anthropic
 requests.
• Adds localization and regression coverage for request shaping and provider-qualified model
 identifiers.

Diagram

graph TD
  REG["Model registry"] --> SEL["Model selector"] --> RES["Model resolution"] --> TEMP["Temperature policy"] --> REQ["Claude request"] --> API["Anthropic API"]
  I18N["English locale"] --> SEL

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High-Level Assessment

The additive registration and centralized temperature exclusion are appropriate because they follow established model-support patterns and keep Claude Opus 5 selectable. A broader capability-metadata redesign could replace the exclusion set, but it would be disproportionate for this isolated model addition.

Files changed (5) +11 / -1

Enhancement (2) +7 / -1

index.mjsRegister Claude Opus 5.5 and promote it as the default Opus preset +6/-1

Register Claude Opus 5.5 and promote it as the default Opus preset

• Adds 'claudeOpus55Api' with the official 'claude-opus-5-5' identifier and includes it among direct Claude API models. Replaces Claude Opus 5 with Opus 5.5 in the default API mode list while retaining Opus 5 as a selectable model.

src/config/index.mjs

temperature-params.mjsSuppress custom temperature for Claude Opus 5.5 +1/-0

Suppress custom temperature for Claude Opus 5.5

• Adds Claude Opus 5.5 to the centralized set of models that reject custom temperature overrides. Existing identifier normalization also applies this restriction to provider-qualified and dotted model forms.

src/services/apis/temperature-params.mjs

Tests (2) +3 / -0

claude-api.test.mjsCover Claude Opus 5.5 request shaping +1/-0

Cover Claude Opus 5.5 request shaping

• Extends direct Claude API tests to verify Opus 5.5 resolves to the correct model, omits custom temperature, and leaves the 'thinking' field unset for adaptive thinking.

tests/unit/services/apis/claude-api.test.mjs

temperature-params.test.mjsCover Opus 5.5 temperature normalization +2/-0

Cover Opus 5.5 temperature normalization

• Adds regression cases confirming temperature overrides are rejected for both 'claude-opus-5-5' and the provider-qualified 'anthropic/claude-opus-5.5' identifier.

tests/unit/services/apis/temperature-params.test.mjs

Other (1) +1 / -0

main.jsonAdd the Claude Opus 5.5 English label +1/-0

Add the Claude Opus 5.5 English label

• Adds the English localization entry used to display Claude Opus 5.5 in model-selection interfaces. Other locales can continue using the existing fallback behavior.

src/_locales/en/main.json

[qodo-code-review]

Code Review by Qodo

🐞 Bugs (0) 📘 Rule violations (0) 📜 Skill insights (0)

1. Non-English users see an English label ✗ Dismissed 📘 Rule violation ⚙ Maintainability

Description

src/_locales/en/main.json adds the Claude Opus 5.5 label, but the same key is absent from every
other supported locale file. Selecting Opus 5.5 under any of the 12 non-English resources therefore
resolves through fallbackLng instead of a locale-owned translation or placeholder.

Code

src/_locales/en/main.json[208]

+  "Anthropic (Claude Opus 5.5)": "Anthropic (Claude Opus 5.5)",

Evidence

Rule 2262059 requires each supported locale to contain a newly introduced localization key.
Repository-wide inspection finds the added key only in the English resource, while both localization
initializers explicitly fall back to English when a locale lacks it.

Rule 2262059: Add new English localization keys before other locales
src/_locales/en/main.json[208-208]
src/_locales/i18n.mjs[4-7]
src/_locales/i18n-react.mjs[5-8]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

## Issue description
The new Claude Opus 5.5 label exists only in the English locale, while the localization rule requires every supported locale to contain either a translation or a clearly marked placeholder.

## Fix Focus Areas
- src/_locales/en/main.json[208-208]

## Recommended Fix
Add the `Anthropic (Claude Opus 5.5)` key to every non-English `src/_locales/<locale>/main.json` file, using an appropriate translation or the project-approved placeholder format.

ⓘ Copy this prompt and use it to remediate the issue with your preferred AI generation tools

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Context sources

✅ Compliance rules (platform): 6 rules

Review mode: ⚖️ Balanced: This is a localized but behavior-changing API model and request-shaping update, so a careful standard review is warranted despite the small diff.

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[Copilot]

Copilot review overview

🟢 Approval recommended

No unresolved review issues were identified.

Review effort: Lite
Findings: None

What changed in this PR

Adds Claude Opus 5.5 support to the Anthropic API integration.

Changes:

• Registers and defaults claude-opus-5-5.
• Preserves adaptive thinking and omits unsupported temperature overrides.
• Adds localization and regression coverage.

File	Description
tests/​unit/​services/​apis/​temperature-params.test.mjs	Tests model ID normalization.
tests/​unit/​services/​apis/​claude-api.test.mjs	Tests Claude request shaping.
src/​services/​apis/​temperature-params.mjs	Blocks unsupported temperature overrides.
src/​config/​index.mjs	Registers and defaults the new model.
src/​_locales/​en/​main.json	Adds the English model label.

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[pullfrog]

✅ No new issues found.

Reviewed changes

• claudeOpus55Api preset — adds claude-opus-5-5 to claudeApiModelKeys and Models with desc Anthropic (Claude Opus 5.5), following the same two-edit pattern as prior Opus/Sonnet additions.
• Default Opus-tier swap — defaultApiModeIds now lists claudeOpus55Api in place of claudeOpus5Api; Opus 5 stays in claudeApiModelKeys/Models and is still selectable for existing users.
• Temperature omission — claude-opus-5-5 added to MODELS_WITHOUT_CUSTOM_TEMPERATURE, with test coverage for both the bare and anthropic/claude-opus-5.5 (dot-normalized) forms.
• Thinking shape — left unset for Opus 5.5, matching the always-on adaptive-thinking behavior shared by Opus 5 / Fable 5/5.1; only claude-sonnet-5 explicitly disables thinking.
• Localization — English identity entry added; other locales use the existing en fallback.

I verified the request-shape matrix (tests/unit/services/apis/claude-api.test.mjs), temperature matrix, and config predicates; the full suite passes (1068/1068), and prettier --check / eslint are clean on the changed files. The temperature set entry is technically prefix-covered by claude-opus-5, but the explicit listing matches the repo's convention for sibling models (e.g. claude-fable-5-1), so no change is suggested.

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