Anthropic Launches Claude Fable 5.2 and Mythos 5.2
Anthropic has released Claude Fable 5.2 and Claude Mythos 5.2, two new frontier models for coding and agent-based tasks, sharing the same base architecture but with distinct safety filters.
What happened?
Anthropic has launched Claude Fable 5.2 and Claude Mythos 5.2, two new frontier models based on the same underlying architecture. Fable 5.2 is optimised for long-term coding, research, and agent-based workflows, while Mythos 5.2 features fewer built-in safety guardrails for cyber and biological domains. The models feature a one-million-token context window and a maximum output capacity of 128,000 tokens, and are made available via the Claude Platform, AWS, Google Cloud, and Microsoft Azure.
Key facts
| Kontextfönster | 1 000 000 tokens |
|---|---|
| Maximal utdata | 128 000 tokens |
| RoboDojo Sim-resultat | 64,9 % |
| AutomationBench-resultat | 51,4 % |
| Lanseringsdatum | 10 november 2026 |
Why it matters
Fable 5.2 surpasses the previous Opus 5.5 in almost all benchmark tests reported by Anthropic, while offering this performance at approximately half the cost compared to the 5.1 models. The launch also demonstrates a bifurcated safety strategy, where the same foundational model is provided with varying levels of restrictions depending on the use case.
Who is affected?
The release targets developers, researchers, and enterprises building advanced coding agents or managing large research databases. Customers on the major cloud platforms AWS, Google Cloud, and Azure gain access to the models via API.
Impact on the EU
Not relevant for EU status. The source does not specify if or how the distribution of Claude Fable 5.2 or Mythos 5.2 differs specifically within the European Union.
What else you should know
The models are provided as a hosted API without open weights. According to Anthropic, Fable 5.2 reached 64.9 percent in RoboDojo Sim, surpassing GPT-6 Astra at 29.8 percent, but trailed Gemini 4 Carbon at 53.9 percent with a score of 51.4 percent in AutomationBench.
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