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Week 20 · May 11–15, 2026 Claude Code CLI · in the page whats-new/2026-w20 …k, the same as Opus 4.6 fast mode. To pin fast mode to Opus 4.6, set `CLAUDE_CODE_OPUS_4_6_FAST_MODE_OVERRIDE=1`. ![The Claude Code model picker showing Opus 4.7 Fast 1M as the default with the Fast…
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