feat: add pricing for Gemini 3 Flash and GPT-5.3-Codex

[mike1858]

• Gemini 3 Flash (gemini-3-flash-preview): $0.50/$3.00 per 1M input/output tokens, $0.05 cached input (Google official pricing)
• GPT-5.3-Codex (gpt-5.3-codex): $1.75/$14.00 per 1M input/output tokens, $0.175 cached input (estimated, API not yet published)
• Added aliases: gemini-3-flash, gemini-3-flash-preview-12-2025

Summary by CodeRabbit

• New Features
  • Added gpt-5.3-codex model with OpenAI caching support and pricing information.
  • Added gemini-3-flash-preview model with Google caching tiers and pricing information.
  • Introduced model aliases for improved name compatibility across new models.

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

Added two new AI model entries to the pricing registry: gpt-5.3-codex (OpenAI) and gemini-3-flash-preview (Google), each with their respective pricing tiers, caching configurations, and aliases for model variant references.

Changes

Cohort / File(s)	Summary
Model Registry Expansion src/models.rs	Added gpt-5.3-codex with flat input/output pricing and OpenAI caching support (estimated model). Added gemini-3-flash-preview with flat pricing and Google caching tiers. Introduced corresponding aliases for both models including variant versions (gemini-3-flash-preview-12-2025, gemini-3-flash).

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• GPT-5-2-Codex #101: Both PRs extend src/models.rs with new codex model variants (gpt-5.2-codex vs gpt-5.3-codex), following similar aliasing and pricing patterns.

Poem

🐰 Two new models hop into view,
Codex and Gemini, shiny and new!
With prices aligned and caches so deep,
The registry grows while rabbits sleep! ✨

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch add-gemini3-flash-gpt53-codex-pricing

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