# Grok 4 Fast release · 2025-09-19 · snapshot 2026-10-25

Creator: SpaceXAI · 2 effort levels

| Effort level | Input modalities | Intelligence | Total cost | E2E | On the frontier today | ID |
|---|---|---|---|---|---|---|
| Grok 4 Fast (Non-reasoning) | Text, Image | 11.10 | - | - | no | `grok-4-fast` |
| Grok 4 Fast (Reasoning) | Text, Image | 17.90 | - | - | no | `grok-4-fast-reasoning` |


> Metrics snapshot: 2026-10-25T15:21:57Z. Intelligence index version: unknown. Release timeline, frontier age, release impact and shakeup cards are reconstructions using one selected snapshot's metrics, not a record of what was known at release. Scores, benchmark cost and derived value may change when the index methodology changes. Source documentation advertises v4.3.2; API correspondence is unverified.