OpenAI: gpt-oss-120b
The OpenAI gpt-oss-120b model is designed for text processing with a context length of 131,072 tokens and supports both reasoning tasks and the use of tools. It can generate structured or unstructured responses based on input, making it versatile for various applications that require deep understanding and complex task execution. Given its price at $0.037 per million input tokens and $0.17 per million output tokens, gpt-oss-120b is a cost-effective choice for projects with moderate to high token requirements. With a blended benchmark score of 43.3 across five independent evaluations, it performs well in tasks such as coding and reasoning but may be less effective in agentic tasks, indicating that while generally competent, its performance varies depending on the specific application.
Benchmark results
Independent, published benchmarks. Blended score 43.1 across 5 benchmarks, last refreshed 2026-07-27. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| Aider Polyglot | code editing across languages | 41.8 |
| AI Index | broad capability composite | 39.3 |
| AI Index Coding | software engineering tasks | 50.2 |
| AI Index Agentic | multi-step tool-using tasks | 21.7 |
| EQ-Bench | emotional understanding in dialogue | 53.4 |
- Model ID
- openai/gpt-oss-120b
- Vendor
- openai
- Released
- August 2025
- Tokenizer
- GPT
- Input Modalities
- text
- Output Modalities
- text
- Max Output
- 131,072 tokens
- Tool Calling
- ✓ supported
- Structured Output
- ✓ supported
- Reasoning Mode
- ✓ supported
- Vision
- text only
- Audio
- no
- Moderated
- no
What it costs in practice
Computed from the current $0.04/M input and $0.17/M output rates. Run your own numbers →
| Job | Tokens | Cost |
|---|---|---|
| Summarize a 50-page report | 30k in / 1.5k out | under $0.01 |
| Classify 1,000 customer emails | 500k in / 50k out | $0.03 |
| A month of a busy support chatbot | 5M in / 2M out | $0.53 |
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Quick answers
- How much does OpenAI: gpt-oss-120b cost?
- $0.04 per million input tokens and $0.17 per million output tokens.
- What is OpenAI: gpt-oss-120b's context window?
- 131,072 tokens, roughly 196 pages of text in a single request.
- Does OpenAI: gpt-oss-120b support tool calling?
- It supports tool calling, structured output, a reasoning mode.
- Can OpenAI: gpt-oss-120b process images?
- No, it is text-only on the input side.