GPT-3.5 Turbo is OpenAI's fastest model. It can understand and generate natural language or code, and is optimized for chat and traditional completion tasks.
Training data up to Sep 2021.
OpenAI: GPT-3.5 Turbo – Uptime and Availability | OpenRouter
Uptime stats for GPT-3.5 Turbo
Uptime stats for GPT-3.5 Turbo across all providers