Opus 4.7, Sonnet 4.8, Capybara: Anthropic’s Model Roadmap Decoded
Last updated: March 2026 The Claude Code source leak of March 31, 2026 exposed Anthropic’s internal model naming system, including references to unreleased versions Opus 4.7 and Sonnet 4.8, along with animal codenames: Fennec (Opus 4.6), Capybara (Claude Mythos / new tier above Opus), and Numbat (still in testing). Internal benchmarks show that Capybara v8 … Read more