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 p...
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.
Default behavior shifts can change latency, cost, and code quality profiles in CI and editor agents.
Silent model migrations impact reproducibility of prior AI-assisted changes and benchmarks.
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Benchmark medium vs high effort (via ultrathink) across representative tasks to set team-wide defaults.
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Regression-test AI-generated edits in CI to verify diffs, tests, and PR quality under Opus 4.6.
Legacy codebase integration strategies...
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Audit and update any configs pinned to Opus 4/4.1 to avoid drift and document new baselines under 4.6.
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Re-run golden prompts/playbooks to compare outputs, then lock versioning and /model settings in automation.
Fresh architecture paradigms...
- 01.
Adopt medium effort as the org default, reserving ultrathink for complex refactors or migrations.
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Codify agent guardrails (review diffs, run tests, PR policy) and editor/CLI workflows from day one.