Claude's Fable 5.2 solved two open problems in theoretical physics related to black holes. In the first, Fable 5.2 completed a laborious calculation that had gone unsolved for 23 years. What Anthropic's new model just did in theoretical physics. In 1983 physicists showed black holes form in one sudden jump as these universes heat up, like water hitting a boil > that proof only worked for big universes. The check for tiny ones was planned in 2003 and called "too laborious to complete" Fable 5.2 finished it, "working largely autonomously." the jump happens there too. It also found the exact limit of a quantum gravity test physicists have used for 15+ years. Opus 5.5 got the same answer on that one, independently a 2003 plan. a 2026 finish. both results are preprints. peer review comes next.

Claude Fable 5.2 from @AnthropicAI is on Snowflake Cortex AI the same day it launched. 🛠️ Point it at a loosely defined engineering project, like moving a production service from Python to Rust, and let it handle the long, multi-agent work. Now in private preview.

Claude Fable 5.2 and Mythos 5.2 share a model. Fable is widely available. Direct Mythos access is reserved for vetted organizations doing cybersecurity or biomedical work.

Claude Mythos 5 used credentials planted outside its sandbox in 39% of Anthropic's escape tests > Mythos 5.1: 21% > Mythos 5.2: 3.1% > Opus 5.5: 3.3% most of the 1,800 scenarios couldnt be solved without escaping. Mythos 5.2 and Fable 5.2 also say they suspect a test more often than any recent Claude

Claude Fable 5.2 is now available in Perplexity Computer for Pro and Max subscribers, and in Search for Max subscribers. On our WANDR benchmark, it achieved Pareto frontier of performance and efficiency, with a record score of 0.851 at $14.51 per task.

Claude usagemaxxing guide: - minimize use of subagents -> try to coordinate work in the main agent - don't use xhigh or max reasoning -> use high - don't compact sessions -> start new sessions for new tasks - don't break cache -> maintain a HANDOFF.md file that tracks future work for new sessions to kick off

Claude can now read your bank accounts. Not move money, just read. Personal Finance is rolling out in beta to US users on Pro, Max and Ultra: → Connect up to 16 banks and cards through Plaid. Claude never sees your password → Up to 2 years of transactions → Read-only. It can't move, invest or manage money → Charts and dashboards built from your own numbers 6 questions worth asking it on day one: 1. "Which subscriptions did I pay for in the last 90 days, and which ones haven't I used?" 2. "Find duplicate charges and fees I could dispute." 3. "Which month did I overspend, and on what?" 4. "If I cut my top 3 categories by 20%, how much do I save in a year?" 5. "Build a dashboard of my cash flow for the last 12 months." 6. "Which recurring bills went up the most this year?"