GPT OSS 120B
GPT OSS 120B is an open-source text generation model from OpenAI, served via Groq with a 128,000-token context window.
OpenAI
GroqOpen-source 120B text generation via Groq
GPT OSS 120B is an open-source large language model developed by OpenAI and made available through Groq's inference infrastructure. Released in August 2025, it carries the identifier openai/gpt-oss-120b and supports a 128,000-token context window with a maximum response size of 32,768 tokens, making it suited for tasks that require processing long documents or generating extended outputs.
Because it is served on Groq hardware, the model is tagged as very fast, reflecting Groq's LPU-based inference approach that prioritizes low-latency token generation. As an open-source model, it is accessible for a broader range of use cases including research, experimentation, and production deployments where transparency into model weights matters. It is a text-only model focused on chat-style interactions and general text generation tasks.
What GPT OSS 120B supports
Long Context Window
Processes up to 128,000 tokens of input in a single request, enabling analysis of long documents, codebases, or multi-turn conversations without truncation.
High-Speed Inference
Served on Groq's LPU infrastructure, which is designed to deliver low-latency token generation at scale for real-time applications.
Open-Source Weights
Released as an open-source model by OpenAI, allowing inspection of model weights and broader use in research and custom deployments.
Extended Response Output
Supports a maximum response size of 32,768 tokens, suitable for generating long-form content such as reports, summaries, or detailed code outputs.
Chat-Based Text Generation
Operates as a chat-format language model (llm_chat), accepting conversational prompts and returning structured text responses.
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Get Started FreeBenchmark scores
Scores represent accuracy — the percentage of questions answered correctly on each test.
| Benchmark | What it tests | Score |
|---|---|---|
| MMLU-Pro | Expert knowledge across 14 academic disciplines | 80.8% |
| GPQA Diamond | PhD-level science questions (biology, physics, chemistry) | 78.2% |
| LiveCodeBench | Real-world coding tasks from recent competitions | 87.8% |
| HLE | Questions that challenge frontier models across many domains | 18.5% |
| SciCode | Scientific research coding and numerical methods | 38.9% |
Common questions about GPT OSS 120B
What is the context window size for GPT OSS 120B?
GPT OSS 120B supports a context window of 128,000 tokens, meaning it can process up to that many tokens of combined input and conversation history in a single request.
What is the maximum response length this model can generate?
The model has a maximum response size of 32,768 tokens per output, which accommodates long-form text generation tasks.
Who publishes GPT OSS 120B and who provides the inference?
GPT OSS 120B is published by OpenAI under the identifier openai/gpt-oss-120b. Inference is provided through Groq's infrastructure on MindStudio.
Is GPT OSS 120B an open-source model?
Yes, GPT OSS 120B is tagged as open source, meaning its weights are publicly available for research and deployment purposes.
Does GPT OSS 120B support image or video inputs?
Based on the available metadata, GPT OSS 120B is a text-only model. Image and video analysis support is not indicated for this model.
What is the pricing for GPT OSS 120B on MindStudio?
Pricing information for GPT OSS 120B has not been published in the available metadata. You can check MindStudio's pricing page or model catalog for the latest details.
What people think about GPT OSS 120B
Community reception on r/LocalLLaMA has been largely positive, with the release announcement drawing over 2,000 upvotes and 551 comments, making it one of the more discussed open-weight model launches in the community. Users have praised the model's coding and reasoning capabilities, with one thread titled "OpenAI GPT-OSS-120b is an excellent model" accumulating 202 upvotes and 146 comments.
Some community members have raised concerns about benchmark performance, particularly on Simple-Bench, where results were described as disappointing in a dedicated thread. Creative writing and EQ-Bench results were also discussed separately, suggesting the community is actively evaluating the model across a range of tasks beyond coding and math.
openai/gpt-oss-120b · Hugging Face
OpenAI GPT-OSS-120b is an excellent model
OpenAI gpt-oss-120b & 20b EQ-Bench & creative writing results
GPT-OSS 120B Simple-Bench is not looking great either. What is going on Openai?
🚀 OpenAI released their open-weight models!!!
Parameters & options
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