OpenAI: gpt-oss-20b
The OpenAI gpt-oss-20b model excels in handling text inputs with a context length of 131,072 tokens and supports both reasoning tasks and integration with tools. Its structured output capability is currently untested; however, it offers robust support for agentic AI applications through its Reasoning feature. This model stands out as a compelling choice for those requiring high-context understanding and efficient tool usage, but are willing to pay the premium of $0.13 per 1,000 output tokens. With a blended benchmark score of 25.7 across four independent assessments, it provides solid performance in text-based tasks while maintaining a balance between cost and capability.
Benchmark results
Independent, published benchmarks. Blended score 25.7 across 4 benchmarks, last refreshed 2026-07-23. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| AI Index | broad capability composite | 24.6 |
| AI Index Coding | software engineering tasks | 34.1 |
| AI Index Agentic | multi-step tool-using tasks | 5.1 |
| EQ-Bench | emotional understanding in dialogue | 40.7 |
- Model ID
- openai/gpt-oss-20b
- 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 $0.03/M input and $0.13/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 | $0.02 |
| A month of a busy support chatbot | 5M in / 2M out | $0.41 |
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Quick answers
- How much does OpenAI: gpt-oss-20b cost?
- $0.03 per million input tokens and $0.13 per million output tokens.
- What is OpenAI: gpt-oss-20b's context window?
- 131,072 tokens, roughly 196 pages of text in a single request.
- Does OpenAI: gpt-oss-20b support tool calling?
- It supports tool calling, structured output, a reasoning mode.
- Can OpenAI: gpt-oss-20b process images?
- No, it is text-only on the input side.