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* 📖 feat: Add Claude Fable 5 Support Claude Fable 5 (`claude-fable-5`) is Anthropic's most capable widely released model (GA 2026-06-09). Its naming drops the opus/sonnet/haiku tier, so LibreChat's name-parsing helpers miss it; this teaches them the Mythos-class family (Fable / Mythos) and registers the model. - Add `parseMythosClassVersion` and route Fable/Mythos through `supportsAdaptiveThinking`, `omitsThinkingByDefault`, `omitsSamplingParameters`, and `supportsContext1m` - Extend the Bedrock detection regexes (beta headers + adaptive-thinking branch) and `checkPromptCacheSupport` to match `claude-(fable|mythos)` - Return 128K max output for Fable/Mythos in `maxOutputTokens.reset`/`set` - Register `claude-fable-5` in shared Anthropic + Bedrock model lists, 1M context / 128K output token maps, and $10/$50 pricing with 12.5/1 cache rates (`claude-mythos-5` added to token + pricing maps only, since it is limited-availability) - Update `.env.example` and the Vertex `librechat.example.yaml` examples - Add parallel tests across tokens, Anthropic llm config, the Bedrock parser, and tx pricing * 🧹 refactor: Centralize Mythos-class detection; address review feedback - Add `isMythosClassModel` + `MYTHOS_CLASS_FAMILIES` in schemas.ts as the single source of truth for the Fable/Mythos family; route every gate (adaptive thinking, omit-thinking, omit-sampling, 1M context, prompt cache, 128K max-output reset/set) through it. A future sibling class is now a one-line edit. - [Codex P2] Exclude Mythos-class from getBedrockAnthropicBetaHeaders: Fable/ Mythos ship 128K output + fine-grained tool streaming by default, and the legacy output-128k-2025-02-19 beta is 3.7-Sonnet-only on Bedrock and risks request rejection. They still get adaptive thinking + effort. - [Copilot] Add Mythos 5 test parity (name variations, cache rates, pinned $10/$50) in tx.spec; add Mythos context/max-output/name-match in tokens.spec; fix the stale claude-3-7-sonnet-only comment in bedrock.ts. - Add isMythosClassModel unit tests covering all declared families. * 📝 docs: Clarify Mythos-class Bedrock requirements; correct beta-omit rationale Verified live against Bedrock (acct 951834775723, us-west-2): - anthropic.claude-fable-5 IS a real Bedrock catalog model, INFERENCE_PROFILE-only exactly like the existing anthropic.claude-opus-4-7/4-8 and claude-sonnet-4-6 default entries (refutes the "invalid model id" review claim). - Mythos-class also requires opting into Anthropic data sharing (Bedrock Data Retention API) before invocation. Changes: - .env.example: note that Mythos-class (Fable/Mythos) is inference-profile-only on Bedrock and needs the data-sharing opt-in. - bedrock.ts: reword the beta-omit comment to the verified rationale — output-128k / fine-grained-tool-streaming are built-in/no-op for the 4.7+ generation, so omitting them is lossless (dropped the unverified "Bedrock may reject" wording). * 🔄 refactor: Reorganize imports in schemas.ts and tx.spec.ts - Moved `TFeedback` and `Tools` imports to the top of `schemas.ts` for better readability. - Adjusted import order in `tx.spec.ts` to maintain consistency and improve clarity.