Overview/API (us-east-1.api.x.ai)/grok-4-fast-reasoning and grok-4-fast-non-reasoning context size limitation
grok-4-fast-reasoning and grok-4-fast-non-reasoning context size limitation
API (us-east-1.api.x.ai)
Issue Resolved
Resolved
The context length limitation has been mitigated.
Feb 3, 2026, 02:02 PM UTCยทDuration: 1d 21h 2m
Updates
Feb 3, 2026, 02:02 PM UTC
Resolved
The context length limitation has been mitigated.
Feb 2, 2026, 05:37 PM UTC
Investigating
We are currently seeing issues on requests where context length is over 120k tokens. Currently investigating root cause.