Claude Sonnet 5

anthropic.com
claude-sonnet-5

Claude Sonnet 5 is built to be the most agentic Sonnet model yet. It can make plans, use tools like browsers and terminals, and run autonomously at a level that, just a few months ago, required larger and more expensive … Read more

Claude Science

claude.com
claude-science

General AI assistants can discuss biology, but they can’t run a pipeline, navigate scientific databases, orchestrate cluster jobs, or keep track of what happened in a previous session. Claude Science manages compute environments per specialist, and saves full provenance on … Read more

Claude: Elevated errors across many models

status.claude.com
claude:-elevated-errors-across-many-models

Subscribe to updates for Elevated errors across many models via email and/or text message. You’ll receive email notifications when incidents are updated, and text message notifications whenever Claude creates or resolves an incident. VIA SMS: Enter mobile number

Why Is Claude Turning into an a**Hole?

bramcohen.com
why-is-claude-turning-into-an-a**hole?

Claude is turning into as asshole. It started with Opus 4.7, got a bit better in 4.8, and became insufferable with Fable. It frames everything as an argument between you and it, gives caveats about things you didn’t say, and … Read more

Claude Fable is relentlessly proactive

simonwillison.net
claude-fable-is-relentlessly-proactive

11th June 2026 After two days of experience with Claude Fable 5 I think the best way to describe it is relentlessly proactive. It knows a whole lot of tricks and it will deploy pretty much any of them to … Read more

If Claude Fable stops helping you, you’ll never know

jonready.com

I didn’t expect to read this in a model card. Fable 5 model card : we’ve implemented new interventions that limit Claude’s effectiveness for requests targeting frontier LLM development (for example, on building pretraining pipelines, distributed training infrastructure, or ML … Read more