15 July 2026 · 18 min read
Cheap Models, Honest Reports: Getting Haiku to Behave Like Sonnet
Haiku ran my fixture suite at parity with Sonnet once the doctrine forced verification and status tokens. The trick is not a better model. It is a tighter contract about what done means. This holds across both Anthropic and OpenAI's durable tier system.
AI agents cost Maestro models Haiku GPT cross-provider