Free GPT model via API
Promo and free GPT routes, including GPT-5.6 Luna when an aggregator serves it at zero price. This is not a ChatGPT subscription.
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The official OpenAI API is paid. This page lists only hosts that marked the route as free in the current snapshot.
Benchmarks: Artificial Analysis (October 24, 2026). A dash means the model is not on their leaderboard; we never estimate scores ourselves.
About GPT
OpenAI's GPT models include proprietary GPT-4o and GPT-5-series models and the open-weight gpt-oss reasoning models.
FAQ
Which GPT models are free?
Currently 4 models are free: gpt-oss-20b, GPT-4o, gpt-oss-120b, gpt-oss-safeguard-20b.
Where can I get a free GPT API key?
Free GPT routes are available at: Groq, Cloudflare Workers AI, NVIDIA Build, UnoRouter. Get a key in the provider's dashboard; links are on each model card.
Who develops GPT?
OpenAI's GPT models include proprietary GPT-4o and GPT-5-series models and the open-weight gpt-oss reasoning models.