Add GPT-5 support through OpenAI API (#35822)
(This PR does not add GPT-5 to Zed Pro, but rather adds access if you're
using your own OpenAI API key.)
<img width="772" height="333" alt="Screenshot 2025-08-07 at 2 23 18 PM"
src="https://github.com/user-attachments/assets/42e75082-118a-4737-89b6-a740ae33b169"
/>
---
**NOTE:** If your API key is not through a verified organization, you
may see this error:
<img width="549" height="253" alt="Screenshot 2025-08-07 at 2 04 54 PM"
src="https://github.com/user-attachments/assets/d0b6d739-9c39-4af3-88d7-0c9609b0e6ba"
/>
Even if your org is verified, you still may not have access to GPT-5, in
which case you could see this error:
<img width="543" height="98" alt="Screenshot 2025-08-07 at 2 09 18 PM"
src="https://github.com/user-attachments/assets/e3ed31e3-2a11-4f07-8f3c-5b410fbe4540"
/>
One way to test if you're in this situation is to visit
https://platform.openai.com/chat/edit?models=gpt-5 and see if you get
the same "you don't have access to GPT-5" error on OpenAI's official
playground. It looks like this:
<img width="581" height="196" alt="Screenshot 2025-08-07 at 2 15 25 PM"
src="https://github.com/user-attachments/assets/ea1454ca-3c10-4703-8126-c02cb92a34f2"
/>
Release Notes:
- Added GPT-5, as well as its mini and nano variants. To use this, you
need to have an OpenAI API key configured via the `OPENAI_API_KEY`
environment variable.
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