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OpenAI
gpt-oss-20b
gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass, optimized for...
TextReasoningToolsOpen Weights131.1K
InputFree
OutputFree
Context131.1K
Endpointsopenai
§ 01
Pricing
| Input price | $0.00 · 1M tokens |
| Output price | $0.00 · 1M tokens |
| Context window | 131.1K tokens |
| Compatible endpoints | openai |
| Vendor | OpenAI |
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Call gpt-oss-20b from your code
Point any OpenAI-compatible SDK at UnoRouter and request the model by name. Replace YOUR_API_KEY with a real key from your dashboard.
bash
curl https://api.unorouter.ai/v1/chat/completions \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-oss-20b",
"messages": [{"role": "user", "content": "Hello!"}]
}'§ 03
Frequently asked questions
How much does gpt-oss-20b cost per 1M tokens?
Input is priced at $0.00 per 1M tokens, output at $0.00 per 1M tokens. Billing is per token, no rounding to batch sizes.
How do I access gpt-oss-20b via API?
Send requests to the UnoRouter /v1/chat/completions endpoint with model=gpt-oss-20b. Any OpenAI-compatible client library works. Authentication uses a standard Bearer token.
What is the context window of gpt-oss-20b?
gpt-oss-20b supports a context window of 131.1K tokens, shared between your prompt and the model's response.
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