OpenAI: gpt-oss-20b (free)

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...

• Context window: 131,072 tokens
• Input: text
• Output: text
• Pricing: $0/M input tokens, $0/M output tokens

View on OpenRouter. Model data sourced from OpenRouter.