feat: add gpt-5.5 support

[scream4ik]

Related GitHub Issue

Closes: #264

Description

Added gpt-5.5 to the OpenAI provider model list.

Test Procedure

• Verified the model appears in the OpenAI provider model list
• Confirmed the application runs successfully after the change

Pre-Submission Checklist

• Issue Linked
• Self-Review completed
• Contribution Guidelines reviewed

Documentation Updates

• No documentation updates are required.

Additional Notes

This PR only adds a new model configuration entry.
The related PR but without tests

Summary by CodeRabbit

• New Features
  • GPT-5.5 model is now available with extended context window, prompt-caching (with retention behavior), configurable reasoning effort levels, verbosity/temperature controls, tool integration, and tiered/flexible pricing including long-context multipliers.
• Tests
  • Added coverage validating GPT-5.5 model metadata and streaming response behavior, including reasoning and verbosity handling.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: cbcb9c82-6b8b-450e-a32f-140ddf3d4f36

📥 Commits

Reviewing files that changed from the base of the PR and between 931b343 and 91b28f5.

📒 Files selected for processing (2)

• packages/types/src/providers/openai.ts
• src/api/providers/__tests__/openai-native.spec.ts

🚧 Files skipped from review as they are similar to previous changes (2)

• packages/types/src/providers/openai.ts
• src/api/providers/tests/openai-native.spec.ts

---

📝 Walkthrough

Walkthrough

This PR registers the OpenAI gpt-5.5 model in the types layer with full capability and pricing metadata and adds tests that verify model lookup and streaming message creation via the Responses API.

Changes

GPT-5.5 Model Addition

Layer / File(s)	Summary
Model definition and configuration packages/types/src/providers/openai.ts	Introduces gpt-5.5 entry to openAiNativeModels with token limits, context window, tool/reasoning/prompt-cache support, tiered and long-context pricing, temperature/verbosity flags, and description.
Model test coverage src/api/providers/__tests__/openai-native.spec.ts	Adds test cases verifying gpt-5.5 model lookup returns expected capabilities and streaming via Responses API with correct request parameters and output handling.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• Zoo-Code-Org/Zoo-Code#42: Both PRs update the gpt-5.5 model configuration—this PR adds gpt-5.5 for the OpenAI native provider and tests it, while #42 adjusts the gpt-5.5contextWindow value for the Codex provider.

Suggested reviewers

• taltas
• hannesrudolph

Poem

🐰 A sprightly rabbit codes with glee,
Five-point-five joins the family tree,
Tokens counted, tests in place,
Streams of answers race and trace,
Hooray — small hops toward API!

🚥 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 accurately describes the main change: adding support for gpt-5.5 model to the OpenAI provider, which matches the changeset modifications.
Linked Issues check	✅ Passed	The PR successfully adds gpt-5.5 model support to the OpenAI provider configuration with comprehensive model configuration including pricing, capabilities, and test coverage, fully addressing issue #264 requirements.
Out of Scope Changes check	✅ Passed	All changes are directly related to adding gpt-5.5 support; model configuration in openai.ts and corresponding test coverage in the spec file are both in scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

Warning

Tools execution failed with the following error:

Failed to run tools: 13 INTERNAL: Received RST_STREAM with code 2 (Internal server error)

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[edelauna]

Thanks for adding tests, some small nits.