MODEL INTELLIGENCE

Claude Fable 5.2
release signals.

Track Claude Fable 5.2 releases, capability changes and related primary-source signals on SXF / AI.

1tracked signals
1primary sources
November 9, 2026latest tracked

LATEST DEVELOPMENT

Claude Fable 5.2 and Mythos 5.2

Anthropic unveiled Claude Fable 5.2 and Mythos 5.2 on November 9, 2026. The company says both use the same underlying model, while Fable applies stronger cybersecurity and biological safeguards for broad access and Mythos uses verification programs for specialized work. Anthropic advertises $8 per million input tokens and $40 per million output tokens, with a higher-priced fast mode and company-run capability benchmarks.

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WHAT CHANGED

Claude Fable 5.2: what changed.

No post-baseline factual changes recorded for since 2026-09-27.

HISTORICAL BASELINE2026-09-27Original ledger snapshot, not the latest source check. See Last verified above.