The preview GPT-4 model with improved instruction following, JSON mode, reproducible outputs, parallel function calling, and more. Training data: up to Dec 2023.
Note: heavily rate limited by OpenAI while in preview.
OpenAI: GPT-4 Turbo Preview – Uptime and Availability | OpenRouter
Uptime stats for GPT-4 Turbo Preview
Uptime stats for GPT-4 Turbo Preview across all providers