Revision History
Claude Opus 4.5 · 14 revisions
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Recent edit summaries
Detailed summaries recorded by editors. Generic maintenance summaries are omitted here; every recorded revision remains below. Dates describe the edit, not necessarily the event it covers.
- Correction: Corrected fabricated system-card framing of Opus 4.5's training, a reversed account of Anthropic's view of the tau2-bench airline loophole (Anthropic called it a gap between the letter and spirit of instructions), an invented ASL-4 preparation statement, the false claim that Project Glasswing was introduced with Opus 4.7, and the false claim that GPT-5.1's context window was unconfirmed (OpenAI documented 400K) (plus 36 minor fixes)
Version 14 · Nov 2, 2026, 06:53 AM
- Update: added the developer's official video.
Version 13 · Nov 1, 2026, 06:41 AM
- Improve internal links (2026-10-13)
Version 11 · Oct 13, 2026, 10:20 AM
- Correction: remove four claims whose cited sources do not contain them, including a token-reduction figure resting on a dead citation and company financial figures attributed to a product-launch story
Version 10 · Oct 1, 2026, 06:49 PM
- Correction: competitor pricing wrong by up to 8x and the conclusion drawn from it, a fabricated Cursor figure, adaptive thinking attributed to the wrong model, a dead citation carrying six claims, a long-context pricing tier contradicted by Anthropic, and subgeneration and benchmark-leadership claims
Version 9 · Oct 1, 2026, 06:48 PM