Add GPT-5.5 long-context pricing

[mike1858]

Summary

• update GPT-5.5 and GPT-5.5 Pro pricing to use OpenAI's published short-context and long-context tiers
• add the GPT-5.5 snapshot alias gpt-5.5-2026-04-23
• use the published GPT-5.5 long-context cached-input rate

Test

• cargo audit
• cargo test models --all-targets

Summary by CodeRabbit

• Updates
  • Updated pricing tiers for gpt-5.5 and gpt-5.5-pro models
  • Updated caching configuration for gpt-5.5
  • Added new versioned model alias gpt-5.5-2026-04-23

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

The pull request updates the model registry for gpt-5.5 and gpt-5.5-pro, introducing tiered pricing structures split at 272,000 tokens and configuring cached input handling. A versioned alias gpt-5.5-2026-04-23 is added, resolving to the canonical gpt-5.5 model entry.

Changes

Cohort / File(s)	Summary
Model Registry Configuration src/models.rs	Updates gpt-5.5 with tiered pricing and tiered Google cached input; converts gpt-5.5-pro to tiered pricing while maintaining null caching. Introduces versioned alias gpt-5.5-2026-04-23 pointing to gpt-5.5.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• Add GPT-5.5 pricing #149: Directly modifies the same gpt-5.5 and gpt-5.5-pro model entries with overlapping pricing and alias updates.
• feat: add Gemini 3.1 Pro pricing and model aliases #125: Updates model pricing and caching configurations using tiered pricing structures similar to this change.
• Fix GPT-5.2 #119: Adds versioned model aliases to MODEL_ALIASES in the same file.

Suggested reviewers

• bl-ue

Poem

🐰 Hop, hop! New tiers have arrived,
At 272k tokens, the prices have thrived,
A versioned alias joins the fray,
gpt-5.5 shines in the brightest way! ✨

🚥 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 summarizes the main change: adding tiered pricing for GPT-5.5 models based on context length, which aligns with the primary modifications to src/models.rs.
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 add-gpt-5-5-long-context-pricing

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