A production AI agent migrated to GPT-5.6 achieved 2.2x speedup and 27% cost reduction.
Take: Nice numbers, but they probably didn't factor in migration costs. Still, GPT-5.6 is a beast—old models are toast.
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https://aicircle.news/archive/2026-07-13?lang=en
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Claude Code sends 33k tokens before reading the prompt, while OpenCode sends just 7k—nearly 5x more.
Take: Claude's efficiency is worrying—tokens aren't free. OpenCode looks more practical; devs will vote with their feet.