Migrating a production AI agent to GPT-5.6: 2.2x faster, 27% cheaper
SMRTR summary
Ploy switched its AI agent from Claude Opus to GPT-5.6 Sol after the new model proved 2.2x faster and 27% cheaper at building real marketing websites. The migration required fixing tool schema issues causing 52-64% empty file reads, rebuilding prompt caching strategy, and resolving reasoning replay failures — problems invisible until production traces were carefully examined.
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