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gpt-oss-20bOPEN
gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license.
Prices update automatically — checked daily against provider list prices.
- $0.06 per 1M tokens, assuming 3 input for 1 output the convention used by Artificial Analysis
- cheaper than 88% of the 191 open-weight models tracked here
- 1 of 88 OpenAI models tracked here, from cheapest
Benchmarks & performance
Independent benchmark scores for gpt-oss-20b, measured by Artificial Analysis. Higher is better. Measurement mode: high.
For the same budget, gpt-oss-20b delivers 26 times more capability. Open weights also mean you can self-host it and pay nothing per token.
Models at this level cost $0.45 per 1M tokens (median of 20) — this one costs $0.06.
Cheaper and better on this index: Solar Pro 4 · Ling-3.0-flash
About this model
gpt-oss-20b is an open-weight AI model by OpenAI. You can download and self-host it for free; the prices below are hosted-API list prices, tracked daily, for when you prefer convenience over self-hosting.
Frequently asked questions
What is gpt-oss-20b?
gpt-oss-20b is an AI language model from OpenAI. It is open-weight: you can download it and run it on your own hardware, for free. It scores 15.2 on the Artificial Analysis intelligence index.
Is gpt-oss-20b free?
The weights are free and open — you can self-host gpt-oss-20b and pay nothing per token. If you prefer a hosted API, list prices are $0.03 per million input tokens and $0.13 per million output tokens.
What is gpt-oss-20b good at?
Independent benchmarks from Artificial Analysis give it GPQA 68.8%, MMLU-Pro 74.8%, Humanity's Last Exam 11%, Long Context Reasoning 33.3%, LiveCodeBench 77.7%, SciCode 34.4%, AIME 2025 89.3%, IFBench 65.1%, τ²-Bench 60.2%, τ-Bench Banking 7%, Terminal-Bench 13.9%, Terminal-Bench Hard 10.6%. It is particularly used for code generation.
How fast is gpt-oss-20b?
It generates about 121 tokens per second, with a median 0.62s delay before the first token. Measured independently by Artificial Analysis.
Can I self-host gpt-oss-20b?
Yes. gpt-oss-20b has open weights, so you can download it and run it on your own GPU or server with tools like Ollama, vLLM or llama.cpp — with no per-token cost.