The most capable free OpenAI model is gpt-oss-120b (free), scoring 33.3 on the Intelligence Index at no per-token cost via OpenRouter. gpt-oss-20b (free) (24.5) is next.
The best large language models with a free tier, ranked by intelligence. Capable AI models you can use at no cost via OpenRouter.
The most capable free OpenAI model is gpt-oss-120b (free), scoring 33.3 on the Intelligence Index at no per-token cost via OpenRouter. gpt-oss-20b (free) (24.5) is next.
gpt-oss-20b (free) (24.5) is the closest alternative on this metric. See the full ranking above for the tradeoffs.
modelgrep tracks 62 OpenAI models with live benchmarks, speed, latency and per-provider pricing, led on intelligence by GPT-5.4. 2 of them qualify for this ranking.