Claude Opus 5.5 just dropped.

Same level as Fable 5.1 on most real work. 40% cheaper to run than Opus 5. $4 in / $20 out. Cache reads cut hard. This is Anthropic quietly making frontier performance the new default price point. Smart move.

Anmol SainiSep 22

Explorable Explanation on How the Web works made with Opus 5.5 medium effort.

Opus worked for 4+ hours and made this experience in a single shot. Only a bunch of interconnected HTML files. Inspired by ncasenmare Explore it yourself here -

NityeshSep 22

A cheaper and faster model

This model performs on par with Claude Fable 5.1 in most tasks, but is about 30% faster and 40% cheaper than Opus 5. Also, the 5-hour session limit for Claude Code users has increased by 20%, and Pro, Max, and Team users have the option to reset the weekly limit once.

زیوست | ZivestSep 22

Xiaomi's MiMo-V2.6-Pro lands within 1-4 points of Claude Opus 5 and GPT-5.6 Sol on agent benchmarks, MIT licensed.

Its training ran on a public dashboard. #MiMoV26 #AITransparency Full edition and full episode:

Shared SapienceSep 22