Grok 4 Fast
by xAI
· GROK 4 family · released Jul 24, 2025
Closed
Active
Low-cost 2M-context production Grok.
Pricing
Launch price (from Jul 24, 2025)
$0.200 in / $0.500 out per 1M tokens
Current price (since Jul 24, 2025)
$0.200 in / $0.500 out per 1M tokens
Cache read: $0.050/M
| Tier | Effective | In $/M | Out $/M | Cache $/M | Per image | Per second | Source |
|---|---|---|---|---|---|---|---|
| Standard | Jul 24, 2025 – now | $0.200 | $0.500 | $0.050 | - | - | - |
| Batch | Jul 24, 2025 – now | $0.100 | $0.250 | - | - | - | - |
Specifications
| Model type | Multimodal |
|---|---|
| Architecture | MoE |
| Parameters | 1,700 (180 active) |
| Context window | 2M tokens |
| Max output | Not disclosed tokens |
| Knowledge cutoff | May 1, 2025 |
| License | Proprietary |
| Modalities | Text input Image input Text output |
| Tags | Long context Reasoning Tool use |
| End of life | Not disclosed |
| Last verified | Aug 20, 2026 |
Benchmarks
| Benchmark | Score | Src |
|---|---|---|
| LMSYS Chatbot Arena Elo | 1,420 | - |