Anthropic releases Claude Fable 5.2 and Mythos 5.2
Original title: Claude Fable 5.2 and Mythos 5.2 cement Anthropic's AI lead just before its IPO
Fable is public with cyber and biology blocks; Mythos is limited to verified cybersecurity and life-sciences organizations.
Anthropic released Claude Fable 5.2 and Claude Mythos 5.2, which share a foundation but differ in access. Fable blocks risky cybersecurity and biology tasks and is available to all users, while Mythos drops some restrictions and is limited to organizations in Anthropic's Verification Programs. Pricing is $8 per million input tokens and $40 per million output tokens. Anthropic still recommends Claude Opus 5.5 for everyday use and says the new models are up to 30 percent faster than the 5.1 versions.
Unconfirmed: Benchmark leads are Anthropic's and Artificial Analysis's figures; Gemini 4 Carbon is not released.
- Artificial Analysis ranks Fable 5.2 first on Index v5 with 65 points.
- It scores 80 percent on HLE-Diamond and 73 percent on Terminal-Bench-Science.
- An optional fast mode can be 2.5 times faster and costs twice as much.
- Mythos 5.2 found 10.2 percent more CVEs than Opus 5.5 in Anthropic's October 2026 test.
- Fable blocks most security tasks, including penetration tests and exploit-code generation.
- Vendors
- Anthropic
- Organizations
- Artificial Analysis
From the original article
6 min read at the-decoder.com
Anthropic is releasing Claude Fable 5. 2 and Mythos 5. 2, its most powerful models to date, in two versions: one freely available and one reserved for verified organizations.
By Matthias Bastian · the-decoder.com
A short excerpt; the article and its images belong to the publisher. Summary, key facts and assessment above are AI-written from the article and can be wrong.