Claude Code v2.1.68 sets Opus 4.6 to medium by default and reintroduces one-turn "ultrathink"
Claude Code v2.1.68 changes default model behavior to Opus 4.6 at medium effort, re-enables a one-turn high-effort "ultrathink" switch, and migrates any users pinned to Opus 4/4.1 to 4.6.
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2026-03-04
claude-code
anthropic
claude-opus-46
claude-sonnet-45
vs-code