DEPRECATED
Retired 2026-05-01 — 138 days ago. Requests to this identifier are expected to fail.
state=dead sunset=2026-05-01 days_remaining=-138 severity=critical sources=litellm evidence_tier=catalog confirmed_by_endpoint=false documented_by_provider=false replacement=none corroborated=single-source divergent_fields=none checked=2026-09-16 03:02Z
xai/grok-4-fast-reasoning
Vendor: xai. Tracked by 1 of 5 sources.
What each source reports
| Source | ID | Context | Max out | In $/Mtok | Out $/Mtok | Sunset |
|---|---|---|---|---|---|---|
| litellm | xai/grok-4-fast-reasoning | — | — | $1.25 | $2.5 | 2026-05-01 |
Change history
| Severity | Change | What | Detected |
|---|---|---|---|
| medium | repriced | xai/grok-4-fast-reasoning: input_price_per_mtok $0.20/Mtok to $1.25/Mtok | 2026-08-30 |
| medium | repriced | xai/grok-4-fast-reasoning: output_price_per_mtok $0.50/Mtok to $2.50/Mtok | 2026-08-30 |
| medium | repriced | xai/grok-4-fast-reasoning: cache_read_price_per_mtok $0.05/Mtok to $0.20/Mtok | 2026-08-30 |
| info | deprecated | azure_ai/grok-4-fast-reasoning: deprecation announced for 2026-05-01 (date already passed) | 2026-08-21 |
| info | deprecated | azure_ai/grok-4-fast-reasoning: retires 2026-05-01 (112 days ago) | 2026-08-21 |
| info | deprecated | xai/grok-4-fast-reasoning: retires 2026-05-15 (78 days ago) | 2026-08-01 |
| info | deprecated | xai/grok-4-fast-reasoning: deprecation announced for 2026-05-15 (date already passed) | 2026-06-05 |