Claude Code eases Opus 4.7 migration

// 45d agoPRODUCT UPDATE

Claude Code eases Opus 4.7 migration

Anthropic says Opus 4.7 is a direct upgrade from Opus 4.6, with a new `xhigh` effort level and stronger instruction following that can make older prompts behave differently. The company recommends retuning prompts and harnesses, and Claude Code now defaults to `xhigh` while adding `/ultrareview`.

// ANALYSIS

This is the right kind of boring infrastructure work: when a model upgrade changes behavior, the real pain is usually in prompts, defaults, and harness assumptions, not the model switch itself.

–Opus 4.7 adds `xhigh`, and Claude Code now treats that as a first-class tuning knob, so migration is partly about preserving latency and cost expectations
–Anthropic says 4.7 is more literal and instruction-faithful than 4.6, which means old prompts can regress unless they’re retuned
–Bundling the migration guidance into the release docs lowers the odds that teams forget model names, effort presets, or prompt phrasing during rollout
–It also reinforces Claude Code as a workflow layer around the model, not just a thin CLI wrapper
–For teams with evals or custom agents, this is a reminder to re-run benchmarks after swapping model versions, even when the migration looks automated

// TAGS

claude-codecliapiprompt-engineeringllmai-codingagent

DISCOVERED

45d ago

2026-04-17

PUBLISHED

46d ago

2026-04-16

RELEVANCE

8/ 10

AUTHOR

ClaudeDevs

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Claude Code eases Opus 4.7 migration