Agent may make mistakes and shouldn't be used in production
Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning.
import { streamText } from 'ai'
const result = streamText({ model: 'xai/grok-4-fast-non-reasoning', prompt: 'Why is the sky blue?'})Try out Grok 4 Fast Non-Reasoning by xAI. Usage is billed to your team at API rates. Free users get $5 of credits every 30 days, and you are considered a free user if you haven't made a payment.
| Model |
|---|
| 2M | 7.1s | 783tps | $2.00/M | $6.00/M | Read: $0.2/M Write: — | — | — |  | 03/11/2026 | ||||
| 2M | 0.5s | 76tps | $2.00/M | $6.00/M | Read: $0.2/M Write: — | — | — | | 03/11/2026 | ||||
| 2M | 2.4s | 63tps | $2.00/M | $6.00/M | Read: $0.2/M Write: — | — | — | | 03/11/2026 | ||||
| 2M | 6.0s | 893tps | $2.00/M | $6.00/M | Read: $0.2/M Write: — | — | — | | 03/09/2026 | ||||
| 2M | 0.6s | 47tps | $2.00/M | $6.00/M | Read: $0.2/M Write: — | — | — | | 03/09/2026 | ||||
| 2M | 1.8s | 68tps | $2.00/M | $6.00/M | Read: $0.2/M Write: — | — | — | | 03/09/2026 | ||||
| — | — | | 01/28/2026 | ||||||||||
| — | — | | 01/28/2026 | ||||||||||
$0.00/img$0.01/sec | — | — | | 01/28/2026 | |||||||||
| 256K | 0.3s | 116tps | $0.20/M | $1.50/M | Read:$0.02/M Write:— | — | — | | 08/28/2025 | ||||
| 256K | 2.9s | 102tps | $3.00/M | $15.00/M | Read: $0.75/M Write: — | — | — | | 07/09/2025 | ||||
| 2M | 1.4s | 266tps | $0.20/M | $0.50/M | Read: $0.05/M Write: — | — | — | | 07/09/2025 | ||||
| 2M | 0.3s | 89tps | $0.20/M | $0.50/M | Read: $0.05/M Write: — | — | — | | 07/09/2025 | ||||
| 2M | 6.5s | 165tps | $0.20/M | $0.50/M | Read: $0.05/M Write: — | — | — | | 07/09/2025 | ||||
| 131K | 1.2s | 38tps | $3.00/M | $15.00/M | Read:$0.75/M Write:— | — | — | | 02/17/2025 | ||||
| 131K | 1.1s | 38tps | $5.00/M | $25.00/M | Read:$1.25/M Write:— | — | — | | 02/17/2025 | ||||
| 131K | 0.3s | 129tps | $0.30/M | $0.50/M | Read:$0.07/M Write:— | — | — | | 02/17/2025 | ||||
| 131K | 0.3s | 114tps | $0.60/M | $4.00/M | — | — | | 02/17/2025 |