feat(chat): add GPT-5.5 to v2 chat pane

[saddlepaddle]

Summary

• Add openai/gpt-5.5 (GPT-5.5) as the newest OpenAI option in the v2 chat pane model picker
• Updated both the server-side chat.getModels registry and the desktop dev fallback list

Test plan

• Open v2 chat pane, confirm GPT-5.5 appears at the top of the OpenAI section in the model picker
• Send a message with GPT-5.5 selected and verify the response routes correctly

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Summary by cubic

Adds openai/gpt-5.5 to the v2 chat pane model picker and server-side model registry. Also updates the desktop dev fallback list so GPT-5.5 appears at the top of the OpenAI section and routes messages correctly.

^{Written for commit 0732aed. Summary will update on new commits. Review in cubic}

Summary by CodeRabbit

• New Features
  • Added GPT-5.5 model as a new chat option, now available in the desktop chat interface during development mode.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4be9514e-ec32-4411-b1ec-ce8a2c12bd24

📥 Commits

Reviewing files that changed from the base of the PR and between 95cff6b and 0732aed.

📒 Files selected for processing (2)

• apps/desktop/src/renderer/lib/dev-chat.ts
• packages/trpc/src/router/chat/chat.ts

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📝 Walkthrough

Walkthrough

Two files are updated to register a new OpenAI model (openai/gpt-5.5, "GPT-5.5") in separate model option lists: one for desktop development chat mode and another for the TRPC chat router's available models endpoint.

Changes

Cohort / File(s)	Summary
Add GPT-5.5 Model Support apps/desktop/src/renderer/lib/dev-chat.ts, packages/trpc/src/router/chat/chat.ts	Register new OpenAI GPT-5.5 model option in development chat mode and TRPC router's available models list.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A new model hops into town,
GPT-5.5 wearing its crown,
In dev chat and routers it gleams,
Making AI dreams come true with beams! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The pull request title clearly and concisely describes the main change: adding GPT-5.5 model support to the v2 chat pane.
Description check	✅ Passed	The pull request description covers the summary and test plan, but omits several required template sections including Related Issues, Type of Change, and Additional Notes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch gpt-55-chat-pane

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[greptile-apps]

Greptile Summary

This PR adds GPT-5.5 (openai/gpt-5.5) to the model picker by inserting it at the top of the OpenAI section in both the server-side AVAILABLE_MODELS registry (chat.ts) and the desktop dev fallback list (dev-chat.ts). The change is consistent and follows existing conventions for model ID format and ordering.

Confidence Score: 5/5

Safe to merge — minimal, consistent change with no logic or security concerns.

Both files are updated symmetrically, the new entry follows the established provider/model-name ID format, and no logic paths are modified. All remaining observations are P2 or below (pre-existing duplication between the two lists is not introduced by this PR).

No files require special attention.

Important Files Changed

Filename	Overview
packages/trpc/src/router/chat/chat.ts	Adds openai/gpt-5.5 entry to the AVAILABLE_MODELS array, following existing naming and provider conventions; no logic changes.
apps/desktop/src/renderer/lib/dev-chat.ts	Mirrors the server-side change by adding openai/gpt-5.5 to DEV_CHAT_MODELS in the same relative position (top of OpenAI section).

Sequence Diagram

sequenceDiagram
    participant UI as Chat UI (model picker)
    participant TRPC as chat.getModels (tRPC)
    participant MODELS as AVAILABLE_MODELS registry

    UI->>TRPC: getModels()
    TRPC->>MODELS: read list
    MODELS-->>TRPC: [...Anthropic models, gpt-5.5, gpt-5.4, gpt-5.3-codex]
    TRPC-->>UI: { models: [...] }
    UI->>UI: render model picker (GPT-5.5 at top of OpenAI section)

    Note over UI: Dev/desktop fallback path
    UI->>UI: isDesktopChatDevMode() → true
    UI->>UI: getDesktopChatModelOptions() → DEV_CHAT_MODELS (includes gpt-5.5)

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_{Reviews (1): Last reviewed commit: "feat(chat): add GPT-5.5 to v2 chat pane ..." | Re-trigger Greptile}

[cubic-dev-ai]

No issues found across 2 files

[github-actions]

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