Hi Timur,
Currently, there's no direct support for GPT-5 or GPT-5-Mini in the Vapi Typescript SDK, but you can use a workaround by employing the "custom-llm" option as described in previous customer interactions. This allows you to perform the chat completions using your implementation until the SDK update includes GPT-5 models.
For more information, keep an eye on updates or announcements regarding GPT-5 support in the SDK. If you have further questions, feel free to ask.