feat(agents): pin opus-medium and opus-xhigh to Opus 5.5 - #45
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Anthropic shipped Opus 5.5 on 2026-09-22 as the successor to Opus 5 at 4 / 0.20 / 20 dollars per million tokens against Opus 5's 5 / 0.50 / 25. The two Opus agents now pin the id 'claude-opus-5-5' instead of the 'opus' alias, so a machine on an older Claude Code build runs the same model as every other. Efforts stay at medium and xhigh. The README table, docs/subagent-routing.md, and docs/model-routing.md carry the new prices and the redone ratios. Sonnet is now 50% of Opus on input and output, Fable is 250%, and Sol on the Codex side matches Opus 5.5's price exactly. The published score rows keep their Opus 5 numbers, labeled as such, because no independent Opus 5.5 score exists yet. Plugin version 1.33.0 to 1.34.0, rev 39 to 40.
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Anthropic shipped Opus 5.5 on 2026-09-22, and this PR moves both Opus rungs of the delegation ladder onto it.
What changed
opus-medium.mdandopus-xhigh.md, pinmodel: claude-opus-5-5instead of theopusalias. The alias resolves to whatever Opus each machine's Claude Code build knows, so an older build could keep sending work to Opus 5. Efforts stay at medium and xhigh.docs/model-routing.mdgains a "Why the ladder changed on 2026-09-22" section, an open question asking for the three-brief rerun on Opus 5.5, and a source line for Anthropic's migration guide.What the docs could not say
No independent Opus 5.5 benchmark has been published. Every Claude score row keeps its Opus 5 number and says so. The case for keeping medium effort rests on Anthropic's migration guide, which says Opus 5.5 at medium matches or beats Opus 5 at high in about half the tokens.
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