Agents & InferenceSimon Willison

Anthropic Opus 5 adoption lags behind cheaper models in July 2026

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Summary A

Billing data from 70,000 Ramp customers indicates Anthropic spend is favoring cheaper models, while its most capable model is seeing weaker uptake because of cost. For production LLM systems, the practical move is to treat flagship models as escalation paths only: default routing, evals, and budget controls should assume cheaper models will handle most workloads unless the quality delta clearly pays for itself.