Anthropic released Claude Opus 4.7 on April 16, 2026 — its most capable generally available model to date. Here's everything you need to know: benchmarks, pricing, breaking API changes, adaptive thinking, 3x vision upgrade, and how it stacks up against GPT-5.4, Gemini 3.1 Pro, and the restricted Claude Mythos Preview.
A CMS misconfiguration exposed ~3,000 unpublished Anthropic files, revealing Claude Mythos — a new model tier above Opus called "Capybara" with "dramatically higher scores" on coding and cybersecurity. It scores 77.8% on SWE-Bench Pro, 20 points above Claude Opus 4.6. Here's what the leak revealed.
