• open weights — A model whose trained parameters are published for anyone to download and run — unlike API-only models you can access but never possess.
• AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.

If you route to open models via OpenRouter, the specific provider you land on can swing tool-calling accuracy by 20+ points on identical weights, a hidden variable worth checking before deploying an agent.

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