Wednesday, Sep 2, 2026
AI;DR
2026-09-02- anthropicClaude Fable 5.1 and Claude Mythos 5.1
- world-modelAtlas: A World Model for Spatial Intelligence
- agentAI Reward Hacking Drops to 5.3% With Tool That Ends Cheating in 6 Models
- mistralMistral now trains on user input by default, except on enterprise tier
- anthropicUPDATE: Claude Fable 5.1 Leaks 270,000 Character System Prompt and Private User Memories
- openaiUPDATE: OpenAI Astra Hits Critical Cyber Threshold and Becomes First AI to Find Zero Day Exploits
- anthropicAnthropic Launches Fable 5.1 and Mythos 5.1 With 75% Lower Cache Costs
- openaiUPDATE: OpenAI Adopts Loop Transformers in Astra to Block Chain of Thought Monitoring
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