Anthropic's top-tier Claude model for hard technical work, with cyber and biology safeguards, released November 2026.
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Claude Fable 5.2 is Anthropic's most capable publicly available model, released on November 9, 2026 alongside Claude Mythos 5.2. Anthropic states that Fable and Mythos are the same underlying model. Fable adds strong cybersecurity and biology safeguards, which allows it to be offered to all users. Mythos is restricted to organizations accepted into Anthropic's Life Sciences and Cyber Verification Programs.
Anthropic reports improvements over Fable 5.1 in coding, reasoning and vision, with up to 30% faster output and a lower price. Published benchmark results include FrontierCode 2.0 (49.1% at Xhigh effort), FrontierSWE v2 (69.9%), OSWorld 2.1 (89.3%) and Humanity's Last Exam with tools (74.2%). An optional fast mode raises generation speed by up to 2.5x at double the price. Anthropic recommends it for open-ended, ambitious work and as an Advisor or Orchestrator for smaller models such as Haiku, Sonnet and Opus. For most everyday tasks it recommends starting with Claude Opus 5.5.
Pricing is $8 per million input tokens and $40 per million output tokens, and $16/$80 in fast mode. Reviewers describe it as the most expensive and one of the slowest options, and note that it uses up usage quotas quickly. They also note deliberate limits in areas such as biology and cybersecurity. Details of safety testing are in the system card published by Anthropic.
Watch the moment: the exact second top creators show it. Videos load only when you press play, via youtube-nocookie.com.
Anthropic's new model launched Nov 9, top of benchmarks and Artificial Analysis. Slightly cheaper than 5.1; the creator uses it as a daily driver. Megabonk test and Busi Bench took about 20 minutes and $5, ranking seventh on his judge leaderboard.
Creator calls it the best model available, citing Artificial Analysis results where Fable 5.2 holds the top three spots on the Intelligence Index. It is also the most expensive, and burns through quota quickly.
Anthropic's latest top model, tested on video creation, piano playing, song production in a DAW, Blender VR tour, Unreal game, physics sim, frog and cancer image tests, and deep research. Ranks #1 on several benchmarks but is the most expensive and slowest, capped at 50% of weekly usage, and deliberately limited for AI research, biology and cybersecurity.
Anthropic's new top publicly available model, a version of Mythos 5.2 with extra cybersecurity guardrails. It sets state of the art on most benchmarks, is aimed at hard problems and orchestration, and costs $8/$40 per million tokens. The creator tested it on a game clone and a hardware gadget design.
New Anthropic model that the creator calls the best he has used. It built complete games, an Excel clone, a video editor and 3D scenes from short prompts. It tops several benchmarks (OSWorld 2.1 at 89.3, Humanity's Last Exam at 74.2). Pricing is $8/$40 per million tokens, about 20% below Fable 5.1, and fast mode costs $16/$80.
Closest neighbours by meaning, not just by category.
Model · Anthropic
Anthropic's premium Claude model for demanding technical work in coding, finance and science.
Model · Anthropic
Anthropic's unrestricted variant of the Fable 5.2 model, available to vetted cybersecurity and biomedical organizations.
Model
Previous-generation frontier Anthropic Claude model, referenced as a benchmark comparison for newer Opus releases.
Model · Anthropic
Anthropic's mid-tier Claude 5.5 model: faster and cheaper than Sonnet 5, aimed at everyday coding and knowledge work.
Model · Anthropic
Anthropic's Claude Mythos model line, listed alongside Fable as its most capable models for technical work.
Model · Anthropic
Anthropic's Claude model for coding, agents and long-running tasks, available via Claude apps, API and major clouds.
