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 lower-latency inference. The model is trained in OpenAI’s Harmony response format and supports reasoning level configuration, fine-tuning, and agentic capabilities including function calling, tool use, and structured outputs.
function_callinghttps://api.deepinfra.com/v1/openai/v1/chat/completions| Model | Context | Max out | Pricing |
|---|---|---|---|
| gpt-oss-20b | 131K | 131K | $0.03$0.14 |
| gpt-oss-120b | 131K | 131K | $0.04$0.17 |
| gpt-oss-120b-Turbo | 131K | — | $0.15$0.6 |
| gpt-oss-120b-Ultra | 131K | — | $0.2$0.95 |
/v1/models/deepinfra/openai/gpt-oss-20b