 OpenAI's 120-billion parameter open-source general-purpose model for text generation, coding, and reasoning tasks.

gpt-oss-120b

Medium-sized open-weight model for low latency

gpt-oss-20b

GPT-5.6 model that balances intelligence and cost

GPT-5.6 model optimized for cost-sensitive workloads

GPT-5.4 mini brings the strengths of GPT-5.4 to a faster, more efficient model designed for high-volume workloads.

cheapest GPT-5.4-class model for simple high-volume tasks

The best model for coding and agentic tasks with configurable reasoning effort

Previous intelligent reasoning model for coding and agentic tasks with configurable reasoning effort

Near-frontier intelligence for cost sensitive, low latency, high volume workloads

Fastest, most cost-efficient version of GPT-5

Fast, affordable small model for focused tasks