Safety Classifiers

Anthropic launched Claude Fable 5.2 and Claude Mythos 5.2, built around one model with two safeguard levels: Fable 5.2 runs classifiers that block high-risk cyber and research-biology requests and routes them to Opus models, while Mythos 5.2 drops those blocks and is limited to vetted organizations. On FrontierCode 2.0, Fable 5.2 scores 49.1% at Xhigh effort versus 45.5% for Opus 5.5 and 42.8% for GPT-6 Astra, and at High effort it matches Opus 5.5's best score at roughly half the cost per task, though Gemini 4 Carbon still leads AutomationBench and all figures are self-reported. Pricing is $8/$40 per million tokens with a 1M-token context window and 128K output, plus a fast mode up to 2.5x faster.