OpenAI: gpt-oss-20b
The OpenAI gpt-oss-20b is a large language model designed for text-based input and output. It supports reasoning capabilities and can be used with tools, but it does not provide structured output. The model's context length is 131,072 tokens and it can generate up to 117,964 completion tokens. This model may be suitable for organizations willing to invest in a high-performing language model. With a blended benchmark score of 22.4 across four independent benchmarks, including AI Index and EQBench, the gpt-oss-20b demonstrates strong capabilities. However, its price point is steep, with $0.03 per million input tokens and $0.13 per million output tokens. Those considering it for their needs should weigh these costs against its performance and requirements.
Benchmark results
Independent, published benchmarks. Blended score 22.4 across 4 benchmarks, last refreshed 2026-09-07. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| AI Index | broad capability composite | 15.1 |
| AI Index Coding | software engineering tasks | 34.1 |
| AI Index Agentic | multi-step tool-using tasks | 2.4 |
| 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
- 117,964 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 |
Price & spec history
Tracked daily by PicksByModel since 2026-07-17.
| Date | Input /M | Output /M | Context |
|---|---|---|---|
| 2026-08-02 | $0.03 | $0.13 | 131,072 |
| 2026-08-01 | $0.03 | $0.14 | 131,072 |
| 2026-07-30 | $0.03 | $0.13 | 131,072 |
| 2026-07-26 | $0.03 | $0.14 | 131,072 |
| 2026-07-25 | $0.03 | $0.13 | 131,072 |
| 2026-07-24 | $0.03 | $0.14 | 131,072 |
| 2026-07-17 | $0.03 | $0.13 | 131,072 |
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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.