Start building with OpenAI’s new open-weight model, gpt-oss-120b, now available on Heroku Managed Inference and Agents . This gives developers a powerful, transparent, and flexible way to build and deploy AI applications on the platform they already trust. Access gpt-oss-120b with our OpenAI-compatible chat completions API , which you can drop into any OpenAI-compatible SDK or framework. Why gpt-oss-120b matters for the AI community and enterprise teams OpenAI has released gpt-oss-120b as part of its new family of open-source models. This 120-billion parameter model and a Mixture-of-Experts (MoE) architecture are designed for a wide range of text generation and understanding tasks. It represents a significant step forward in making powerful AI more accessible to the developer community. Key features of the gpt-oss-120b include: Open Weight: As an open-weight model, developers can inspect the model’s architecture, understand its inner workings, and fine-tune it for specific use cases.…