Claude Opus 4.1 is an AI model released by Anthropic on Aug 5 2025, 75 days after Claude Opus 4. It is the 13th tracked release from Anthropic out of 19 total.
On published benchmarks, it scores 80.9% on GPQA Diamond (graduate-level science reasoning), 74.5% on SWE-Bench Verified (real-world software engineering).
About Anthropic: AI safety company building the Claude family of models. Founded in 2021 by former OpenAI researchers.