OpenCode Zen Support

[entity]

It would be awesome if y'all could add OpenCode Zen support, https://opencode.ai/docs/zen/ - I assume it would handle similar to the OpenRouter implementation.

Right now I have to do janky stuff like Provider::Anthropic for GPT-5 and such.

[ahosker]

OpenCode Zen use the default OpenAI endpoint schema.

In Prism the OpenAI URL is configured in config/prism.php to use the OPENAI_URL environment variable with a default value of https://api.openai.com/v1.. You could simply set OPENAI_URL in your .env set it to https://opencode.ai/zen/v1.

It would confusingly be called OpenAI but thats about it.

[ahosker]

However, I did ask OpenCode to create the provider, it worked great and here is the pull request #796

[entity]

Thanks for this @ahosker - with Prism I noticed that numerous models had issues when using the OpenAI provider that's why. See these:

[ahosker]

You are right @entity. After looking, I was wrong in my assumption that Zen normalises the requests.

Many (the majority) of the models work fine with using OpenAI schema/endpoint, but they have different endpoints for anthropic models and Google models.

You could still do it, changing the Claude URL in the .env, and it should then work for those models.