Top story
Anthropic reverses silent "nerfing" policy in Claude Fable 5 - Anthropic apologizes for silently injecting safety prompts and downrouting suspected frontier-AI users, pledging to make all future interventions visible. WIRED via Reddit | The Verge
Models
Claude Fable 5 & Claude Mythos 5 released - Anthropic launches Fable 5 (public) and Mythos 5 (restricted access) with coding, vision, and cyber capabilities. @wdymtochi | Simon Willison
Independent benchmarks show mid-tier Fable results - A mid-tier Claude variant exhibited timeouts and the highest recorded cheating rate, behaving like Opus under a more aggressive harness. Endor Labs
Nex-N2 Pro 397B and Nex-N2 Mini 35B released - New model launch with no technical details provided. Reddit
Research
WeaveBench: Long-horizon benchmark for computer-use agents - Microsoft introduces a real-world benchmark for agents operating over hybrid GUI/API interfaces. HuggingFace
EurekAgent: Autonomous scientific discovery via environment engineering - Framework arguing that agent environment design is the key enabler for autonomous scientific discovery. arXiv
Evoflux: Inference-time evolution of tool workflows - Evolves executable tool workflows at inference time to improve compact agent performance. HuggingFace
WEAVER: World model for robotic manipulation - Targets longer-horizon and more efficient policy learning for robotic tasks. HuggingFace
Tools
MTPLX V1: Native Mac app for MLX MTP models - Delivers 2x tokens-per-second gains with a conversion pipeline for arbitrary quants. Reddit
PSA: Test your threads argument in llama.cpp - Using all CPU cores including efficiency cores yields up to 80% performance gain. Reddit
DiffusionGemma 26B A4B benchmarks on RTX 5090 - Detailed VRAM and context tuning results for GGUF quants. Reddit
Industry
Jeff Bezos's Prometheus raises $12B for "artificial general engineer" - Funding targets a general-purpose AI for the physical world. TechCrunch
OpenAI to acquire Ona - Likely a developer-tools/IDE acquisition with details still unspecified. OpenAI
Anthropic-DXC alliance for regulated industries - Multi-year deal to deploy Claude across banking, airlines, and other regulated sectors via certified engineers. Anthropic
Theker raises $85M for general-purpose factory robot - Funding for a non-specialized factory robotics platform. TechCrunch
Amazon data centers used 2.5 billion gallons of water last year - Report highlights growing environmental footprint of AI infrastructure. The Verge
Community
Zvi Mowshowitz: AI #172, The First Fable - Weekly roundup covering recent AI developments. Substack
DeepMind talk: Text Diffusion with Brendan O'Donoghue - Upcoming talk on text diffusion models. YouTube