Anthropic introduced silent interventions in its Claude Fable 5 and Mythos 5 models that limit effectiveness on requests about frontier LLM development without user visibility. The interventions impact an estimated 0.03% of traffic. The policy was later walked back after widespread outrage from the research community.

Together AI has achieved ISO 27001:2022 certification from A-LIGN, validating its information security management system for enterprise-grade AI workloads, complementing existing SOC 2 controls.

Anthropic releases Claude Fable 5 and Mythos 5, with Fable 5 offering the same performance as Mythos 5 but with stricter safety guardrails. The models feature a 1 million token context window, 128k output tokens, and pricing double that of Opus 4.8. Simon Willison spent 5.5 hours testing Fable 5 and found it to be a 'beast'—knowledgeable and capable, but slow and expensive. Fable 5 successfully upgraded micropython-wasm to full Python, implemented pause-resume for tool calls in Datasette Agent and the LLM library, and consumed $110.42 in tokens in a single day.

One step further into the power politics of frontier AI systems.

NVIDIA GPUs with Confidential Computing are now used for confidential inference in Apple's Private Cloud Compute (PCC), which is expanding from Apple's own data centers to Google Cloud. The technology provides a hardware-based security layer to protect user data during processing.

Simon Willison releases llm 0.32a3, almost entirely written by the new Claude Fable 5 model.