OpenAI: gpt-oss-20b

gpt-oss-20b is a groundbreaking open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It leverages a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass, specifically engineered for lower-latency inference and efficient deployment on consumer or single-GPU hardware. This model is trained in OpenAI’s Harmony response format, offering advanced capabilities such as reasoning level configuration, fine-tuning, and robust agentic features including function calling, tool use, and structured outputs. With a generous 131K token context window and 4K token max output, gpt-oss-20b is ideal for complex conversational AI. Access it FREE on Multi AI, with competitive pricing at $0.02/$0.10 per 1M input/output tokens.