GPT OSS models from OpenAI are now available on SageMaker JumpStart

Today, we are excited to announce the availability of Open AI’s new open weight GPT OSS models, gpt-oss-120b and gpt-oss-20b, from OpenAI in Amazon SageMaker JumpStart. With this launch, you can now deploy OpenAI’s newest reasoning models to build, experiment, and responsibly scale your generative AI ideas on AWS.

In this post, we demonstrate how to get started with these models on SageMaker JumpStart.

Solution overview

The OpenAI GPT OSS models (gpt-oss-120b and gpt-oss-20b) excel at coding, scientific analysis, and mathematical reasoning tasks. Both models feature a 128K context window and adjustable reasoning levels (low/medium/high) to match specific requirements. They support external tool integration and can be used in agentic workflows through frameworks like Strands Agents, an open source AI agent SDK. With full chain-of-thought output capabilities, you get detailed visibility into the model’s reasoning process. You can use the OpenAI SDK to call your ...