gpt-oss-20b
20Bby OpenAI
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 and deployability on consumer or single-GPU hardware. 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.
Specifications
Technical details and pricing.
Benchmarks
10 benchmark scores from Artificial Analysis.
Composite Indices
Intelligence, Coding, Math
Standard Benchmarks
Academic and industry benchmarks
Frequently Asked Questions
What is gpt-oss-20b good for?
Use gpt-oss-20b for everyday tasks like writing, summarizing, brainstorming, and getting clear explanations.
How much does gpt-oss-20b cost?
Pricing is based on usage. Current rates are $0.07/1M tokens for input and $0.23/1M tokens for output.
Can I try gpt-oss-20b for free?
Yes. You can start a chat instantly and test the model before deciding on a plan.
Does gpt-oss-20b support images or audio?
gpt-oss-20b focuses on text-based tasks.
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Benchmarks and pricing are sourced from Artificial Analysis where available. OpenRouter specs are used as a fallback.