Cohere incident

Chat models return 503 service error when /v1/chat requests omit message and chat_history while providing tool_results

Notice Resolved

Cohere experienced a notice incident on October 18, 2025, lasting 36m. The incident has been resolved; the full update timeline is below.

Started
Oct 18, 2025, 09:46 PM UTC
Resolved
Oct 18, 2025, 10:23 PM UTC
Duration
36m
Detected by Pingoru
Oct 18, 2025, 09:46 PM UTC

Update timeline

No vendor updates were posted for this incident — only the open and resolve events were observed.