anthropic.com › news › claude-opus-4-6 Claude Opus 4.6 … Product and API updates We’ve made substantial updates across Claude, Claude Code, and the Claude Platform to let Opus 4.6 perform at its best. … Feb 5, 2026
anthropic.com › news › claude-sonnet-4-6 Introducing Sonnet 4.6 … All runs used the Terminus-2 harness, except for OpenAI’s Codex CLI. … Feb 17, 2026