Claude Opus 4.7 sharpens its edge, but Mythos still leads

Anthropic released Claude Opus 4.7, a meaningful upgrade with better coding, sharper vision, and a new ability to double-check its own work, while acknowledging it still trails Mythos, which remains unreleased to the public. In benchmarks Opus 4.7 outperforms Opus 4.6 and rivals like ChatGPT 5.4 and Google Gemini 3.1 Pro on several tasks, but Mythos Preview remains ahead for now. The update also adds an xhigh (extra high) effort mode for Claude Code, introduces Task Budgets to control long-task reasoning, and raises guardrails as Anthropic tests safeguards ahead of a broader Mythos release.