OpenAI: gpt-oss-20b (openai/gpt-oss-20b) costs $0.018 per 1M prompt tokens and $0.09 per 1M completion tokens, has a 131,072-token context window, and supports tool calling, structured outputs, reasoning and response format. Data updated 2026-10-30.
- Prompt price
- $0.018 / 1M tokens
- Completion price
- $0.09 / 1M tokens
- Context
- 131,072 tokens
- Input modalities
- text
- Output modalities
- text
- Tokenizer
- GPT
- Instruct type
- —
- Knowledge cutoff
- 2024-06-30
- Hugging Face
- openai/gpt-oss-20b
Last price change: 2026-09-22
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...