What
Claude Code has infrastructure to switch Fast Mode labeling and model selection from Opus 4.6 to Opus 4.7.
Status
Environment-gated
Details
- The new gate is
CLAUDE_CODE_ENABLE_OPUS_4_7_FAST_MODE. - When enabled, Fast Mode text can report
Opus 4.7; otherwise it remains onOpus 4.6. - Because this is gated by an environment variable and existing docs elsewhere still mention Opus 4.6 Fast behavior, treat this as experimental rather than broadly available.
Evidence
Environment-gated model switch (search for "CLAUDE_CODE_ENABLE_OPUS_4_7_FAST_MODE" and "Opus 4.7")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.