Anthropic's Claude Fable 5.2 tops Irregular's CyScenarioBench multi-stage cyberattack benchmark, ahead of GPT-6 Cyber
On 9 November 2026 (cnbc.com), Anthropic released Claude Fable 5.2 and Claude Mythos 5.2, which it says improve coding, reasoning and vision. On Irregular's CyScenarioBench, which measures whether a model can plan and execute a multi-stage cyber operation in a realistic environment, Fable 5.2 completed 76.3% of challenges, against 61.7% for Fable 5.1 and 61% for OpenAI's GPT-6 Cyber. Irregular's separate reports credit Google's Gemini 4 Argon with 12 end-to-end solves in a subset of the suite. Fable 5.2 also scored 89.6% on Anthropic's internal CVE Rediscovery benchmark, which tests rediscovery of known open-source flaws from source code alone. Mythos 5.2's cyber capabilities remain gated behind the Cyber Verification Program. This is benchmark and product news with no reported exploitation or victim, so the direct risk to defenders is limited.
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Anthropic's Claude Fable 5.2 tops Irregular's CyScenarioBench multi-stage cyberattack benchmark, ahead of GPT-6 Cyber
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On 9 November 2026 (cnbc.com), Anthropic released Claude Fable 5.2 and Claude Mythos 5.2, which it says improve coding, reasoning and vision. On Irregular's CyScenarioBench, which measures whether a model can plan and execute a multi-stage cyber operation in a realistic environment, Fable 5.2 completed 76.3% of challenges, against 61.7% for Fable 5.1 and 61% for OpenAI's GPT-6 Cyber. Irregular's separate reports credit Google's Gemini 4 Argon with 12 end-to-end solves in a subset of the suite. Fable 5.2 also scored 89.6% on Anthropic's internal CVE Rediscovery benchmark, which tests rediscovery of known open-source flaws from source code alone. Mythos 5.2's cyber capabilities remain gated behind the Cyber Verification Program. This is benchmark and product news with no reported exploitation or victim, so the direct risk to defenders is limited.