Leak: Anthropic Opus 5.5 may land Monday or Tuesday, with always-on adaptive thinking
mark_k · x · 2026-09-21
Unconfirmed leak from X user lyraxana claims Anthropic's Opus 5.5 is arriving next week — possibly Monday, dated Tuesday.
Details:
- Anthropic marked the release "imminent" and partners got only 24h access.
- Thinking is ALWAYS adaptive, with no "off" mode.
- Forced tool use is retired.
- Pricing details were included in the leak.
Not yet confirmed by Anthropic.
More from Models
- a16z's Martin Casado: Google's Carbon is 'really good at code' — xennygrimmato_ · 2026-11-12
- Blogger vouches for rumored Gemini 4 Carbon: good taste, cost-effective — intellectronica · 2026-11-12
- Walden Robotics' Sage model quadruples robot uptime on Toyota factory lines — adnothing · 2026-11-12
- Gemini won't let you keep chat history while opting out of AI training — Google bundles both into one setting — arshdeep · 2026-11-12
- Gemini 4 Carbon Flex tier now costs the same per token as GPT 6.1 Terra — mariofilhoml · 2026-11-12
- Real-world test: Kimi K3.1 Pro costs 5.4x less than Opus 5.5 per task despite 2x list-price gap — Arindam_1729 · 2026-11-12