fix: apply Opus 4.7 API contract to Claude Opus 4.8#3418
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Co-Authored-By: ForgeCode <noreply@forgecode.dev>
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May 29, 2026
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Bug
Claude Opus 4.8 is registered as a model but isn't recognized by the model-specific request transforms. Because its model ID doesn't match any known family, it falls through to the legacy (pre-4.5) code path.
Opus 4.8 follows the same API contract as Opus 4.7, where the API returns 400 errors for:
temperature/top_p/top_ksampling parameters, andthinking.enabledwithbudget_tokens).Today, requests to Opus 4.8 send exactly these rejected parameters (and a backfilled legacy thinking budget), so every Opus 4.8 request fails. It also drops the
effortparameter that the model actually supports, and sends a redundant interleaved-thinking beta header.Fix
Recognize Opus 4.8 as sharing Opus 4.7's contract so the correct, backward-compatible transforms are applied. No behavior changes for any other model.