Model Tracker
gpt-oss-120b
gpt-oss-120b is an AI model made by OpenAI. OpenAI released it on 5 August 2025. It is generally available. It takes text and returns text.
gpt-oss-120b is an AI model made by OpenAI. OpenAI released it on 5 August 2025. It is generally available. It takes text and returns text. Its weights are open. Its licence is Apache 2.0.
- Released
- 5 August 2025 — openai.com, read 16 October 2026
- Status
- Generally available — openai.com, read 16 October 2026
- Takes
- Text — cdn.openai.com, read 16 October 2026
- Returns
- Text — cdn.openai.com, read 16 October 2026
- Open weights
- Yes — openai.com, read 16 October 2026
- Licence
- Apache 2.0 — cdn.openai.com, read 16 October 2026
- Context window
- Not confirmed: two readings disagree: 128000 and 131072
- Longest answer
- Not confirmed: The maker's pages reviewed do not print a standard maximum output-token limit for this model.
- Knowledge cutoff
- Not confirmed: The maker's pages reviewed do not state a knowledge-cutoff date for this model.
- API price, input
- Not confirmed: OpenAI states that gpt-oss models are not served through the OpenAI API and that OpenAI API pricing does not apply.
- API price, output
- Not confirmed: OpenAI states that gpt-oss models are not served through the OpenAI API and that OpenAI API pricing does not apply.
- Where
- Downloadable weights — openai.com, read 16 October 2026
- Parameters
- Not confirmed: two readings disagree: 116830000000 and 117000000000
- Model card
- Not confirmed: two readings disagree: https://cdn.openai.com/pdf/419b6906-9da6-406c-a19d-1bb078ac7637/oai_gpt-oss_model_card.pdf and https://openai.com/index/gpt-oss-model-card/
Benchmarks
Measured by others, not by the maker: each score with the name the measurer gives the model and the setting it ran, its day and its licence.
Arena
- Text Arena, gpt-oss-120b: 1,352 (1,347–1,356, 30,206 votes), published 15 October 2026
Arena’s leaderboard dataset (lmarena-ai/leaderboard-dataset on Hugging Face), CC BY 4.0: ratings from people’s votes between two anonymous models, as Arena publishes them. Data · CC BY 4.0
Epoch AI
- Epoch Capabilities Index, gpt-oss-120b: 140.0 (135.9–142.4), as of 19 October 2026
- GPQA Diamond, openai/gpt-oss-120b_high: 75.8% (± 2.7), run 11 December 2025
- OTIS Mock AIME 2024–2025, openai/gpt-oss-120b_high: 88.9% (± 4.5), run 11 December 2025
Epoch AI, ‘Capabilities & benchmarking’, epoch.ai/benchmarks, CC BY 4.0: Epoch AI’s own runs and its Capabilities Index. Data · CC BY 4.0
Questions
When was gpt-oss-120b released?
OpenAI released gpt-oss-120b on 5 August 2025.
Is gpt-oss-120b still available?
Yes: it is generally available, as OpenAI states it.
Are the weights of gpt-oss-120b open?
Yes: OpenAI publishes the weights of gpt-oss-120b for download.
What is the licence of gpt-oss-120b?
The licence of gpt-oss-120b is Apache 2.0, as OpenAI names it.
What does gpt-oss-120b take and return?
gpt-oss-120b takes text and returns text.
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Sources
- Introducing gpt-oss (read 16 October 2026)
- gpt-oss-120b & gpt-oss-20b Model Card (read 16 October 2026)
- Open models by OpenAI (read 16 October 2026)
- OpenAI open-weight models (gpt-oss) (read 16 October 2026)