How can you optimize a rollout plan from Sonnet 4.6 to Sonnet 5?

Begin with a small, representative slice of production traffic rather than a full cutover, selecting traffic that spans your typical range of task complexity and request patterns so the initial signal reflects real-world behavior rather than an unrepresentative subset.

Instrument the rollout to separately track the specific dimensions most likely to shift: token usage split between thinking and response content, max_tokens truncation incidents, any new HTTP 400 errors from the three known breaking-change patterns, and output quality on a representative evaluation set, rather than relying on a single aggregate success metric that could mask a problem in one dimension while looking fine overall.

Keep Sonnet 4.6 available as an active fallback route throughout the rollout rather than decommissioning it immediately, so that if an issue surfaces at a larger traffic percentage than your initial test slice, traffic can be shifted back without an emergency rollback under production pressure.

Expand the traffic percentage in stages, validating each stage's cost, latency, and quality metrics against both the Sonnet 4.6 baseline and your own acceptance thresholds before advancing further, and only fully decommission the Sonnet 4.6 path once the full-traffic stage has run long enough to have reasonable confidence across your actual production task distribution, not just the initial representative sample.

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