GPT-4-0314 is the first version of GPT-4 released, with a context length of 8,192 tokens, and was supported until June 14. Training data: up to Sep 2021.
OpenAI: GPT-4 (older v0314) – Uptime and Availability | OpenRouter
Uptime stats for GPT-4 (older v0314)
Uptime stats for GPT-4 (older v0314) across all providers