Knowledge Cutoff And Training Data Awareness

gpt-oss-120b is an open-weight, 117B-parameter Mixture-of-Experts (MoE) language model from OpenAI designed for high-reasoning, agentic, and general-purpose production use cases. It activates 5.1B parameters per forward pass and is optimized...

Unique: OpenAI's transparent knowledge cutoff date with explicit training on acknowledging limitations, enabling graceful degradation when queried about out-of-distribution information rather than hallucinating recent events

vs others: More transparent about knowledge limitations than some competitors, with better reasoning about recent events when provided context than models without explicit training on knowledge cutoff awareness