OpenAI: gpt-oss-20b (free) API Pricing
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...
Input / 1M tokens
Free
Output / 1M tokens
Free
Cost per request (1K in / 500 out)
Free
~$0.00 per 1M tokens mixed
Specifications
Context Window 131K tokens
Max Output Tokens 8,192
Vision Support No
Function Calling No
Streaming Yes
Modality text
Release Date 2025-08-05
Price history will appear here after the first price change is detected.
More from OpenAI
Input / 1M tokens
$0.60
Output / 1M tokens
$2.40
Context: 128K Streaming
Multimodal
Input / 1M tokens
$5.00
Output / 1M tokens
$30.00
Context: 400K Vision Streaming
Input / 1M tokens
$0.50
Output / 1M tokens
$1.50
Context: 16K Streaming
Input / 1M tokens
$1.00
Output / 1M tokens
$2.00
Context: 4K Streaming
Similar Models from Other Providers
Input / 1M tokens
Variable
Output / 1M tokens
Variable
Context: 128K Streaming
Input / 1M tokens
Variable
Output / 1M tokens
Variable
Context: 128K Streaming
Input / 1M tokens
Variable
Output / 1M tokens
Variable
Context: 2.0M Streaming
Input / 1M tokens
Free
Output / 1M tokens
Free
Context: 33K Streaming
Input / 1M tokens
Free
Output / 1M tokens
Free
Context: 33K Streaming