fix: prevent double-prefixing of Bedrock cross-region inference models#12056
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rekram1-node merged 1 commit intoanomalyco:devfrom Feb 4, 2026
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Models from models.dev may already include cross-region inference profile prefixes (us., eu., global., jp., apac., au.). Previously, only global. and jp. prefixes were checked, causing models with us., eu., apac., or au. prefixes to be double-prefixed (e.g., us.us.anthropic.claude-...). This fix expands the prefix check to include all cross-region inference profile prefixes, ensuring models that already have a regional prefix are passed through to the SDK without modification. Fixes anomalyco#12052
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Summary
Problem
Models from models.dev may already include cross-region inference profile prefixes like:
us.anthropic.claude-opus-4-5-20251101-v1:0→ "Claude Opus 4.5 (US)"eu.anthropic.claude-opus-4-5-20251101-v1:0→ "Claude Opus 4.5 (EU)"global.anthropic.claude-opus-4-5-20251101-v1:0→ "Claude Opus 4.5 (Global)"Previously, only
global.andjp.prefixes were checked, causing models withus.,eu.,apac., orau.prefixes to be double-prefixed (e.g.,us.us.anthropic.claude-...), which AWS rejects as invalid.Solution
Expanded the prefix check to include all cross-region inference profile prefixes:
global.us.eu.jp.apac.au.Models that already have a regional prefix are now passed through to the SDK without modification, while models without prefixes continue to get prefixed based on the user's region.
Backward Compatibility
This fix is backward compatible:
anthropic.claude-opus-4-5-20251101-v1:0) will continue to be prefixed based on the user's AWS regionus.anthropic.claude-opus-4-5-20251101-v1:0) will be used as-isFixes #12052