All modelsCalculate what your real prompts cost on gpt-oss-20b
gpt-oss-20b
OpenAI model, released 5 Aug 2025.
$0.018
per 1M input tokens
$0.09
per 1M output tokens
$0.009
per 1M cached-read tokens
Price history
input $/1M output $/1M7 Jul 2026 → 22 Sept 2026
Specifications
- Lab
- OpenAI
- Released
- 5 Aug 2025
- Context window
- 131k tokens
- Max output
- 33k tokens
- Input modalities
- text
- Output modalities
- text
- Knowledge cutoff
- 2024-06-30
- Open source
- No
Benchmarks
| Benchmark | Category | Score | As of |
|---|---|---|---|
| LMArena (Chatbot Arena) | coding | 1307.4 (1294.2–1320.5) | 13 Sept 2026 |
| LMArena (Chatbot Arena) | overall | 1287.3 (1280.9–1293.7) | 13 Sept 2026 |
LMArena (Chatbot Arena) data © their authors, CC-BY-4.0
Frequently asked questions
How much does gpt-oss-20b cost?
gpt-oss-20b costs $0.018 per 1M input tokens and $0.09 per 1M output tokens (list price, updated every 6 hours).
What is gpt-oss-20b's context window?
gpt-oss-20b supports a 131k-token context window with up to 33k output tokens.