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Anthropic released Claude Opus 5, at the same $5/$25 pricing tier as
Opus 4.8. Neither the chat recipe allowlist nor CANONICAL_PRICING knew
about it, so operators could not opt into it via models.tier.deep /
models.default without gbrain rejecting the id.
- src/core/ai/recipes/anthropic.ts: add claude-opus-5 to the models list.
- src/core/model-pricing.ts: add anthropic:claude-opus-5 { input: 5.00,
output: 25.00 } (plus cache rates, matching Opus 4.8's ratios).
- src/core/takes-quality-eval/pricing.ts: add it to SUPPORTED_MODELS so
eval takes-quality run --budget-usd doesn't reject it during preflight.
- Refreshed the stale pricing-verification date and the Opus list in
docs/architecture/KEY_FILES.md.
- Tests: pinned-value regression in test/model-pricing.test.ts, recipe
membership in test/anthropic-model-ids.test.ts, budget-pricing coverage
in test/eval-takes-quality-pricing.test.ts.
Scope: registration only. TIER_DEFAULTS / DEFAULT_ALIASES /
DEFAULT_CHAT_MODEL are untouched — default-routing bumps are the
separate, already-open #2858; this just makes the id valid/priced for
operators who opt in explicitly.