How Four AI Gateways Offer Free Model Access and the Business Models Behind Them

A handful of AI gateway platforms — OpenRouter, AgentRouter, Freebuff, and Experiential Labs — are providing developers meaningful free access to frontier and open-weight AI models through distinct subsidy and growth strategies. OpenRouter offers a curated free tier of open-weight models such as DeepSeek R1 and Llama variants via a smart router, capped at roughly 200 requests per day, treating free access as community-building while monetizing paid usage across its broader catalog. AgentRouter, a self-described non-profit API gateway, attracts users through a referral-based credit system, reportedly offering around $100 in starting credits, though it is positioned more for prototyping and learning than production workloads. Freebuff takes a different approach by embedding free model access directly into a coding-agent product — including a CLI, desktop app, and web app builder — requiring no API key or credit balance from users. Each platform sustains its free offering through a different mechanism, ranging from provider subsidies and ecosystem goodwill to viral referral growth and product-led distribution.