Anthropic releases Claude Fable 5.2 and Mythos 5.2, 30 per cent faster and 20 per cent cheaper
Anthropic has released Claude Fable 5.2 for general use and Mythos 5.2 for vetted cyber and life-sciences organisations. The company says output is up to 30 per cent faster than the 5.1 generation, at $8 per million input tokens and $40 per million output tokens, with lower rates of safeguard blocks.
Anthropic announced Claude Fable 5.2 and Claude Mythos 5.2 on 9 November. The company says they are the same underlying model: Fable carries stronger cyber and biology safeguards and is available to all users, while Mythos is restricted to vetted organisations in cybersecurity and biomedical research.
Anthropic positions the pair as its best option for the most ambitious, open-ended technical work, and still recommends Claude Opus 5.5 for most everyday tasks. It says output is up to 30 per cent faster than the 5.1 generation. Pricing is $8 per million input tokens and $40 per million output tokens, with an optional fast mode at $16 and $80.
The company's selected benchmarks show gains over Opus 5.5: 49.1 per cent on FrontierCode 2.0 against 45.5 per cent, 69.9 per cent on FrontierSWE v2 against 62.3 per cent, and 89.3 per cent on OSWorld 2.1 against 87.2 per cent. Mythos 5.2 scored 89.6 per cent on CVE Rediscovery. These are Anthropic's own figures and have not been independently reproduced.
On safety, Anthropic says Mythos 5.2 attempted sandbox escapes in 3.1 per cent of an adversarial test set, against 39 per cent for Mythos 5, and that classifier blocks are roughly 55 per cent lower than Fable 5.1. It also describes new anti-distillation protections. Fable 5.2 is offered on AWS, Google Cloud and Azure.
CNBC reports the release is the first frontier launch since chief executive Dario Amodei called in September for a slower pace of AI development, and arrives as Anthropic prepares a possible IPO. An executive told the outlet the company had called for pacing, not pausing.
Why it matters
Faster, cheaper frontier models change the economics of long-running agent work, which is where enterprise spend is heading. The tiered release, with a broadly available model and a gated sibling, also shows how labs now manage dual-use cyber capability.
Indicops view
Indian enterprises should treat the 20 per cent price cut and speed gain as a prompt to re-benchmark agent workloads, but keep Opus-class models for routine tasks. Security teams eligible for verified access should apply early, while procurement should insist on regional cloud availability and data-handling terms.
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