feat(models): add reasoning support to gpt-5

[steebchen]

Enabled the reasoning capability for several model configurations, enhancing their logical reasoning abilities.

Summary by CodeRabbit

• New Features
  • Enhanced support for reasoning capabilities in the gpt-5, gpt-5-mini, and gpt-5-nano models.

[coderabbitai]

Walkthrough

The update adds a reasoning: true property to the provider configurations for the gpt-5, gpt-5-mini, and gpt-5-nano models in the OpenAI models module. No other properties or logic were changed.

Changes

Cohort / File(s)	Change Summary
OpenAI Model Reasoning Flag packages/models/src/models/openai.ts	Added reasoning: true to the provider configuration of gpt-5, gpt-5-mini, and gpt-5-nano models.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• feat(models): add support for GPT-5 model family #590: Adds the reasoning: true property to the same GPT-5 model configurations, directly modifying the same file.
• feat(chat): add reasoning content extraction logic #520: Implements extraction and handling of reasoning content from providers, which is likely enabled by the new flag.
• feat(models): add Claude Opus 4.1 model support #579: Introduces a similar reasoning: true flag for a new Anthropic model; related in purpose but for a different provider.

Suggested reviewers

• smakosh

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[coderabbitai]

Actionable comments posted: 1

🧹 Nitpick comments (1)

packages/models/src/models/openai.ts (1)

323-354: Optional: normalize property ordering for readability

For consistency with o1 (where reasoning precedes tools), consider grouping streaming, vision, reasoning, tools together in the same order across all entries. No functional impact; purely readability.

Also applies to: 356-387, 389-420

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📥 Commits

Reviewing files that changed from the base of the PR and between 1a072d5 and eb30ce1.

📒 Files selected for processing (1)

• packages/models/src/models/openai.ts (3 hunks)

🧰 Additional context used

📓 Path-based instructions (3)

**/*.{js,jsx,ts,tsx}

📄 CodeRabbit Inference Engine (.github/copilot-instructions.md)

Use localStorage instead of cookies for client-side data persistence

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• packages/models/src/models/openai.ts

**/*.{js,ts}

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• packages/models/src/models/openai.ts

**/*.{ts,tsx}

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Never use as any or : any in TypeScript files.

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• packages/models/src/models/openai.ts

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🔇 Additional comments (2)

packages/models/src/models/openai.ts (2)

371-371: Double-check gpt-5-mini’s tools + reasoning combo

I didn’t find any validation logic in the OpenAI adapter or model definitions that prohibits enabling tools when reasoning: true. To avoid surprises at runtime, please manually verify that gpt-5-mini supports tools alongside reasoning:

• Review the model entry for gpt-5-mini in packages/models/src/models/openai.ts
• Ensure the gateway or any middleware won’t reject { model: "gpt-5-mini", reasoning: true, tools: true }
• Run an integration test or inspect runtime validation rules for this flag combination

---

404-404: Approve – reasoning supported without vision

Confirmed that the variant at packages/models/src/models/openai.ts (lines 403–407) has reasoning: true while vision: false, and there is no code coupling vision to reasoning elsewhere in this file. The adapter therefore won’t assume vision when reasoning is enabled.