feat(models): add gpt-5.4-mini and nano

[rcogal]

Summary

• Add OpenAI GPT-5.4 Mini ($0.75/$4.50 per 1M tokens) — strong mini model for coding, computer use, and subagents
• Add OpenAI GPT-5.4 Nano ($0.20/$1.25 per 1M tokens) — cheapest GPT-5.4-class model for high-volume tasks

Both models support 400K context, 128K max output, reasoning, vision, tools, web search, and structured outputs.

Test plan

• E2E tests pass with TEST_MODELS="openai/gpt-5.4-mini,openai/gpt-5.4-nano" (80 passed)
• Prompt caching verified with cached tokens confirmed
• Build succeeds

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features
  • Added support for two new OpenAI models, gpt-5.4-mini and gpt-5.4-nano. Both models are available with published pricing, context size and max output limits, and enable advanced capabilities including streaming, vision, tools, web search, reasoning, and structured JSON output.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: d48a222b-700d-4b65-bf9a-e14fe3c300ff

📥 Commits

Reviewing files that changed from the base of the PR and between 8da2f39 and e2a2bdd.

📒 Files selected for processing (1)

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

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Walkthrough

Two new OpenAI model entries—gpt-5.4-mini and gpt-5.4-nano—were added to the openaiModels array with full provider configurations (pricing tiers, context sizes, max output tokens, and capability flags).

Changes

Cohort / File(s)	Summary
OpenAI model additions packages/models/src/models/openai.ts	Added gpt-5.4-mini and gpt-5.4-nano entries to openaiModels including providerId, modelName, pricing, contextSize, maxOutput, and capability flags (streaming, vision, tools, webSearch, reasoning, jsonOutput/jsonOutputSchema).

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• feat: add support for gpt-5.1 #1150: Adds new OpenAI model entries (gpt-5.1) to the same openaiModels array in packages/models/src/models/openai.ts.
• feat(models): add GPT-5.4 and GPT-5.4 Pro OpenAI models #1796: Adds other GPT‑5.4 family model entries (e.g., gpt-5.4, gpt-5.4-pro) to the same models registry.
• feat(models): add support for GPT-5 model family #590: Adds GPT‑5 family model variants, including mini/nano-style entries, to openaiModels.

Suggested reviewers

• steebchen
• kmk142789

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat(models): add gpt-5.4-mini and nano' directly and clearly summarizes the main change: adding two new OpenAI model entries (gpt-5.4-mini and gpt-5.4-nano) to the models configuration.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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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 feat/add-gpt-5.4-mini-nano

📝 Coding Plan

• Generate coding plan for human review comments

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