Amazon Web Services (AWS) has made OpenAI's AI models available on its platform.

The cloud giant revealed on August 5 that it would be offering "open weight models" from OpenAI via Amazon Bedrock and Amazon SageMaker AI for the first time.

This will include OpenAI's two new open weight foundation models gpt-oss-120b and gpt-oss-20b.

"Open weight models are an important area of innovation in the future development of generative AI technology, which is why we have invested in making AWS the best place to run them—including those launching today from OpenAI," said Atul Deo, director of product, AWS.

"The addition of OpenAI as our newest open weight model provider marks a natural progression in our commitment to bringing cutting-edge AI to organizations worldwide, and the unmatched size of our customer base marks a transformative shift in access to OpenAI’s advanced technology."

The models were already available for download via Hugging Face, but the announcement is indicative of shifting AI and cloud provider relationships.

AWS has a deep partnership with Anthropic, long offering its Claude models, one of OpenAI's biggest competitors. The cloud giant has invested extensively in Anthropic, with Anthropic training its new models using AWS infrastructure, including the cloud company's in-house Trainium chips via the Project Rainier supercluster of Trainium2 UltraServers.

Meanwhile, OpenAI and Microsoft have worked together closely. Until January of this year, Microsoft held a lock in on OpenAI models. While Microsoft is no longer OpenAI's exclusive cloud provider - having signed major contracts with Oracle, CoreWeave, and even Google Cloud in recent months - the two are still reportedly negotiating Microsoft's ongoing rights to OpenAI technology.

The move from AWS to add OpenAI to its offerings comes at a timely moment, after the cloud company was hit with questions during its latest earnings call about its slower revenue growth compared to competitors Microsoft and Google, as well as what was described as the "Wall Street finance person narrative" that AWS is falling behind on generative AI compared to its peers.

AWS saw revenue growth of 17.5 percent year over year for the quarter, while Google Cloud grew 32 percent and Microsoft was up 26 percent. Despite this, AWS retains the lion's share of the cloud computing market, with the company achieving an annualized revenue run rate of more than $123 billion.