Model fails to process very long prompts
API (us-east-1.api.x.ai)
Issue Resolved
Resolved
grok-4-fast is fully operational for long prompts.
Oct 29, 2025, 07:16 PM UTCยทDuration: 1h 11m
Updates
Oct 29, 2025, 07:16 PM UTC
Resolved
grok-4-fast is fully operational for long prompts.
Oct 29, 2025, 06:47 PM UTC
Recovering
The model is back online and traffic is resuming.
Oct 29, 2025, 06:19 PM UTC
Investigating
grok-4-fast currently fails to process very long prompts. Short prompts are unaffected.