Built-in and custom model providers

[ksze]

Continue.dev has a built-in list of supported model providers (deepseek, openai, etc.) for whom some properties Continue.dev knows by default.

However, there are two issues:

• The full list of providers with built-in support is not in the documentation. I had to clone the git repo and dive into the code to tell which providers have built-in support.
• New inference providers pop up on the market every few weeks, but there's no clear pathway to cleanly add custom providers short of modifying the Continue.dev code base and creating a PR. E.g., I want to add GLM 4.6 from Z.ai, but Z.ai is not one of the built-in providers. I could specify the provider as "openai" and then override the apiBase with Z.ai's API base URL, but that's dirty because if I then publish the model config to hub.continue.dev, it shows the model as coming from openai when it really doesn't. I wish you would have a way to explicitly specify OpenAI-compatible or Anthropic-compatible as a separate property from the provider's actual name