Grok 4.1 Fast charges $0.20 per 1M input tokens and $0.50 per 1M output tokens (cached input: $0.04/M). Real bills depend on your input/output split — the tables below price Grok 4.1 Fast at 1K–1M tokens across common workload shapes. Verified Aug 19, 2026
Cost by token volume
| Volume | Input-heavy (90/10) | Balanced (70/30) | Output-heavy (30/70) | All input | All output |
|---|---|---|---|---|---|
| 1,000 tokens | $0.00023 | $0.00029 | $0.00041 | $0.0002 | $0.0005 |
| 10,000 tokens | $0.0023 | $0.0029 | $0.0041 | $0.002 | $0.005 |
| 100,000 tokens | $0.023 | $0.029 | $0.041 | $0.02 | $0.05 |
| 1 million tokens | $0.23 | $0.29 | $0.41 | $0.20 | $0.50 |
Uncached. Volume links open interactive pages with adjustable splits.
Prompt caching impact
| Cached share of input | Chat request (4K in / 800 out) | Monthly @ 10K req/day | Savings / month |
|---|---|---|---|
| 0% | $0.0012 | $360.00 | — |
| 50% | $0.00088 | $264.00 | −$96.00 |
| 75% | $0.00072 | $216.00 | −$144.00 |
Monthly projections
| Scale | Requests / day | Chat workload / month | Agentic workload / month* |
|---|---|---|---|
| 100 req/day | 3,000 | $2.64 | $13.77 |
| 1K req/day | 30,000 | $26.40 | $137.70 |
| 10K req/day | 300,000 | $264.00 | $1,377.00 |
| 100K req/day | 3,000,000 | $2,640.00 | $13,770.00 |
Chat: 4K in / 800 out, 50% cached. *Agentic: 40K in / 1.5K out, 65% cached. Model your exact mix in the monthly cost calculator.
FAQ
1M purely input tokens cost $0.20; 1M purely output tokens cost $0.50. A typical mixed workload lands in between — see the volume table for exact splits.
A chat-style request (4,000 input + 800 output) costs about $0.00088 with 50% cached input, or $0.0012 without caching.
At 1,000 requests/day of a chat workload (4K in / 800 out, 50% cached): $26.40/month. At 10,000 requests/day: $264.00/month. Model your exact mix with the monthly cost calculator.