Developers are choosing older AI models, and the data explains why
BlogDevelopers are choosing older AI models — and the data explain whyOctober 20, 2025byMolisha ShahAt Augment Code, we run multiple frontier models side by side in production. This gives us a unique vantage point into how different models behave in real coding workflows. Usage patterns suggest developers are no longer just chasing the newest model; they are matching models to specific task profiles.This post shares data from millions of live interactions and discusses what it may reveal about model adoption, behavioral differences, and system-level trade-offs.Model Adoption Is FragmentingOver the first week of October 2025, Sonnet 4.5’s share of total requests declined from 66% → 52%, while Sonnet 4.0 rose from 23% → 37%. GPT-5 usage stayed steady at about 10–12%.DateSonnet…
