gpt-oss-120bOpen Weight
Released
gpt-oss-120b is an AI model released by OpenAI on Tuesday, Aug 5 2025, 56 days after o3-pro. It is an open-weight model — the trained weights are available to download and run. It is a 117B parameter model with a 128k token context window. Benchmark results (shown below) cover MMLU, BullshitBench v2, SWE-Bench Verified, Humanity's Last Exam, and GPQA Diamond.
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Available from
| Near AI | — | $0.03 | $0.15 | 128K | fp4 |
|---|---|---|---|---|---|
| Venice | — | $0.03 | $0.15 | 128K | int4 |
| CoreWeave | — | $0.03 | $0.17 | 128K | fp4 |
| DeepInfra | — | $0.037 | $0.17 | 128K | bf16 |
| DekaLLM | — | $0.03 | $0.18 | 128K | bf16 |
| AkashML | — | $0.03 | $0.187 | 128K | bf16 |
| Crusoe | — | $0.05 | $0.25 | 128K | bf16 |
| Mancer 2 | — | $0.05 | $0.25 | 128K | fp8 |
| Novita | — | $0.05 | $0.25 | 128K | fp4 |
| DigitalOcean | — | $0.06 | $0.42 | 128K | — |
| BaseTen | — | $0.10 | $0.50 | 128K | fp4 |
| BaseTen | us | $0.10 | $0.50 | 128K | fp4 |
| Amazon Bedrock | — | $0.15 | $0.60 | 128K | — |
| Amazon Bedrock | eu-west-1 | $0.15 | $0.60 | 128K | — |
| Groq | — | $0.15 | $0.60 | 128K | — |
| Nebius | — | $0.15 | $0.60 | 128K | fp4 |
| Phala | — | $0.15 | $0.60 | 128K | — |
| SiliconFlow | — | $0.15 | $0.60 | 128K | fp8 |
| Together | — | $0.15 | $0.60 | 128K | — |
| Parasail | — | $0.10 | $0.75 | 128K | fp4 |
| Mara | — | $0.15 | $0.75 | 128K | — |
| Cerebras | — | $0.35 | $0.75 | 128K | fp16 |
| SambaNova | — | $0.14 | $0.95 | 128K | — |
Benchmarks
Coding
Reasoning & science
Robustness
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gpt-oss-120b, released August 5, 2025 alongside the smaller gpt-oss-20b, was OpenAI's first open-weight language model since GPT-2 in 2019 — six years in which the company that popularised the term "open" shipped nothing downloadable. Both models came under Apache 2.0 with no usage restrictions and no commercial gate. The 120B is a mixture-of-experts design with about 5.1B parameters active per token, sized to fit on a single 80GB accelerator, while the 21B sibling was built to run on a high-end laptop.
The launch figures put it close to OpenAI's own mid-tier closed models: 80.1% on GPQA Diamond and 62.4% on SWE-Bench Verified, 90.0% on MMLU, and 14.9% on Humanity's Last Exam without tools, rising to 19.0% with them. OpenAI framed the release as a response to the Chinese open-weight wave — DeepSeek R1 and Kimi K2 had spent the preceding months setting the pace for freely downloadable models — and shipped it two days before GPT-5, which took the attention.
Frequently asked questions
gpt-oss-120b was released by OpenAI on Tuesday, Aug 5 2025.