fix: resolve Bedrock and cross-region Anthropic model IDs in model info lookup

[kimnamu]

Thanks to the maintainers. Small bug fix (no new features — consistent with maintenance-mode scope). This fills a gap so Bedrock-hosted Claude IDs resolve like the native ones — native Anthropic IDs already resolve; only the Bedrock/cross-region forms were missing.

Fixes #7833.

Problem / cause

The matcher in _model_info.py is prefix-anchored (model.startswith(model_id.split("-2")[0])), so anthropic. / us./eu./apac./global.anthropic. prefixes and the -vN:M suffix never match → get_info raises KeyError, get_token_limit silently returns the 100000 fallback.

Change

A small shared _normalize_model() helper, called by both get_info and get_token_limit, strips the optional [region.]anthropic. prefix and -vN:M suffix. Native IDs and table values unchanged.

Item	Before	After
get_info("us.anthropic.claude-3-5-sonnet-20240620-v1:0")	❌ KeyError	✅ resolves to claude-3-5-sonnet-20240620 entry
get_token_limit("anthropic.claude-…-v1:0")	❌ 100000 fallback	✅ 200000 (table)
global./eu./apac. prefixes	❌ KeyError	✅ resolve
Native IDs (claude-3-5-sonnet-20240620, claude-opus-4-0)	✅	✅ unchanged
Public API / function signatures	—	unchanged
_MODEL_INFO / _MODEL_TOKEN_LIMITS table values	—	unchanged (out of scope)

Tests

Added a parametrized no-network test; reverting the source (test kept) → 5 failures with the KeyError above; restored → 5 pass; full no-network anthropic suite 23 passed. ruff format/check clean, pyright 0 errors.

Out of scope / follow-up: correcting individual table values (context windows etc.) is a separate data concern, intentionally left out to keep this minimal.

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This contribution was prepared with the help of an AI agent (Claude Code); a human reviewed the change, rationale, and test results before submission.

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