Frontier AI models are expensive to call directly. A single day of heavy Claude or GPT-5 usage in an agentic coding loop can rack up real money. But a small cluster of gateways and coding-agent products has figured out how to hand developers meaningful free access anyway.
Source: [Dev.to](https://dev.to/dibyajyoti0/how-freebuff-agentrouter-openrouter-and-experiential-labs-give-you-free-ai-models-and-the-23lc)