Reported by @spring halo
Bug Report: Agent mode does not work with GPT-5
`Steps to Reproduce`
Start a conversation with GPT-5. Then, turn on agent mode with Google Drive. Type your prompt and hit send and it will say Model Not Found
`Expected Result`
Agent mode to work
`Actual Result`
Error: Model not found
`Environment`
Browser (Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36)