On the FAQ you reference there is a one dedicated to exactly that question...which llm does it use: "We’re aiming to support the models that best suit the needs

On the FAQ you reference there is a one dedicated to exactly that question...which llm does it use: "We’re aiming to support the models that best suit the needs of our users. Plus, the AI market is evolving at a rapid pace. Our customers don't want to be tied long-term to a single provider. Currently, most AI Assistant features use OpenAI, but we’re preparing to release new code completion models that are trained by JetBrains. There is also an ongoing track with other providers (e.g. Google and others) regarding their models. Still, for the majority of use cases, OpenAI is our current LLM provider. For the on-premises scenario, we will serve the provider included in the cloud platform (AWS Anthropic, Google PaLm 2, or Azure OpenAI)."