Anthropic announced Claude Fable 5.2 and Claude Mythos 5.2 on November 9. They share an underlying model, with Fable adding cybersecurity and biology safeguards. This is an official 5.2 release, not confirmation of the earlier 5.5 webpage-label rumor.

Access is model-specific

The current Fable page lists Pro, Max, Ultra, Team and Enterprise access, plus developer platforms. Mythos is restricted to organizations admitted through Anthropic’s cyber or life-sciences verification programs; a normal subscription does not establish Mythos API access.

The exact API IDs are claude-fable-5-2 and claude-mythos-5-2. Their model documentation lists a 1M-token context window, 128K maximum output and always-on adaptive thinking. These specifications do not replace the separate 5.1 benchmark rows.

Lower Standard rates; optional fast mode

Standard input/output rates are $8/$40 per million tokens, versus $10/$50 for 5.1. Optional fast mode costs $16/$80. Platform availability and account eligibility remain separate conditions; these are token tariffs, not guaranteed task costs.

Anthropic reports stronger technical-work results and faster output in its own evaluations. Those vendor comparisons are not independent leaderboard measurements. Its electronics study describes working prototypes assembled by human engineers, not certified mass-production designs.