Add Claude Fable 5 model support#101
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Claude Fable 5 (claude-fable-5) is GA on the first-party Anthropic API as of 2026-06-09. Register it with $10/$50 per-MTok pricing and supports_temperature=False (adaptive-thinking-only, rejects temperature like Opus 4.7+). https://claude.ai/code/session_01RawhhYfSfUkatbo7WUvoEA
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Summary
Add support for Anthropic's Claude Fable 5 model to the TEE gateway. This is Anthropic's most capable widely released model, available on the first-party API from 2026-06-09.
Changes
CLAUDE_FABLE_5enum entry with Anthropic provider configurationclaude-fable-5supports_temperature=False(adaptive-thinking-only model rejects temperature parameter with HTTP 400, similar to Opus 4.7+)"claude-fable-5"string key in the model name lookup dictionarytest_claude_fable_5_resolves()to verify model configuration resolution and pricingCLAUDE.mdto include Claude Fable 5 in the list of supported Anthropic model prefixesImplementation Details
Claude Fable 5 is an adaptive-thinking-only model that does not support the
temperatureparameter (returns HTTP 400 if provided), consistent with recent Opus models (4.7+). The pricing reflects the model's capability tier relative to other Claude variants.https://claude.ai/code/session_01RawhhYfSfUkatbo7WUvoEA