fix(pricing): support GPT-5.5 tiered pricing

[IvGolovach]

Summary

• Add support for GPT-5.5 pricing data that uses model-specific long-context tier fields, including above-272k token prices.
• Preserve GPT-5.x model names in Wrapped output, including GPT-5.5, GPT-5.5 Pro, and GPT-5.5 XHigh variants.
• Add regression coverage for GPT-5.5 lookup, tier suffix matching, tiered cost calculation, LiteLLM field deserialization, and provider inference.

Why

LiteLLM pricing metadata is not limited to the existing above-200k shape. Newer OpenAI model entries can expose additional above-threshold fields such as above-272k token prices. Without reading those fields, Tokscale can undercount long-context GPT-5.5 usage and display GPT-5.5-family models less precisely in Wrapped summaries.

Changes

• Extend LiteLLM ModelPricing deserialization with 128k, 256k, and 272k input/output tier fields, plus 272k cache-read pricing.
• Generalize tiered cost calculation so each token bucket uses the correct ordered threshold instead of assuming a single 200k breakpoint.
• Keep existing 200k tier behavior while allowing models with different tier thresholds to price correctly.
• Add GPT-5.5 lookup coverage and provider inference coverage.
• Add Wrapped display formatting for GPT-5.x model names without collapsing minor versions.
• Include a narrow clippy cleanup in the Antigravity macOS path lookup so this branch passes the repository's strict lint job on current main.

Validation

• bash scripts/check-version-coherence.sh
  • Version coherence OK: 2.0.27
• cargo test --workspace -- --quiet
  • 1131 passed; 0 failed; 2 ignored
• cargo test --workspace --all-features -- --quiet
  • 1131 passed; 0 failed; 2 ignored
• cargo fmt --all --check
• /opt/homebrew/Cellar/rust/1.94.0/bin/cargo-clippy clippy --workspace --all-features -- -D warnings
• git diff --check origin/main...HEAD

Branch Notes

• Base: junhoyeo/tokscale@main (edc8ed1fca49ec4a6936e4d4e15ca45dfd442b8e at validation time)
• Head: IvGolovach:codex/gpt-5-5-pricing-support-current-main
• Branch status at validation time: 2 commits ahead, 0 commits behind origin/main

Risk

Low. The pricing change keeps the existing base-price and above-200k paths intact, adds support for additional LiteLLM fields, and covers the new behavior with focused unit tests.

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
tokscale	Ignored	Preview	Apr 28, 2026 3:33pm

[cubic-dev-ai]

No issues found across 6 files