[simonw]

The big advantage of a hosted open model is insurance against model changes.

If you carefully craft and evaluate your more complex prompts against a closed model... and then that model is retired, you need to redo that process.

A lot of people were burned when OpenAI withdrew Codex, for example. I think that was a poor decision by OpenAI as it illustrated this exact risk.

If the hosted model you are using is open, you have options for continuing to use it should the host decide to stop offering it.