Which is cheaper for input tokens: xAI: Grok 4.1 Fast or xAI: Grok 4 Fast?
xAI: Grok 4.1 Fast is cheaper or equal on input token cost by $0.00 per 1M tokens.
Head-to-Head Pricing Benchmark
xAI: Grok 4.1 Fast vs xAI: Grok 4 Fast
Side-by-side pricing and context window comparison for production model selection.
Input delta: $0.00Output delta: $0.00Monthly delta: $0.00
Default Recommendation (120M input + 60M output)
xAI: Grok 4.1 Fast is lower-cost for the default monthly workload scenario.
Adjust the workload in the calculator below to see a live recommendation for your usage.
| Metric | xAI: Grok 4.1 Fast | xAI: Grok 4 Fast |
|---|---|---|
| Developer | x-ai | x-ai |
| Context Window | 2,000,000 | 2,000,000 |
| Input Cost / 1M Tokens | $0.2000 | $0.2000 |
| Output Cost / 1M Tokens | $0.5000 | $0.5000 |
| Projected Monthly Cost | $54 | $54 |
| Vision | ✅ Yes | ✅ Yes |
| Tool Calling | ✅ Yes | ✅ Yes |
| Structured Output | ✅ Yes | ✅ Yes |
| Reasoning | ✅ Yes | ✅ Yes |
| MMLU Score | 74.3 | 85.4 |
| GPQA | 63.7 | 85.3 |
Price History
xAI: Grok 4.1 Fast Pricing Trend
Input / 1M tokens0.0%Output / 1M tokens0.0%
Mar 7 — Mar 11
Current Input / 1M
$0.2000
Current Output / 1M
$0.5000
Price History
xAI: Grok 4 Fast Pricing Trend
Input / 1M tokens0.0%Output / 1M tokens0.0%
Mar 7 — Mar 11
Current Input / 1M
$0.2000
Current Output / 1M
$0.5000
Cost Calculator
Adjust your workload to see projected monthly costs.
01.0B
0500M
xAI: Grok 4.1 Fast
$54
per month
Lower costxAI: Grok 4 Fast
$54
per month
Live Recommendation
xAI: Grok 4.1 Fast is lower-cost at 120M input + 60M output tokens/month.
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FAQ
Common questions for xAI: Grok 4.1 Fast vs xAI: Grok 4 Fast pricing decisions.
Which is cheaper for output tokens: xAI: Grok 4.1 Fast or xAI: Grok 4 Fast?
xAI: Grok 4.1 Fast is cheaper or equal on output token cost by $0.00 per 1M tokens.
What is the projected monthly cost difference between xAI: Grok 4.1 Fast and xAI: Grok 4 Fast?
$0.00 difference for the default scenario (120M input + 60M output tokens/month).
How should I choose between xAI: Grok 4.1 Fast and xAI: Grok 4 Fast?
Use this page to compare context window and token pricing, then open each model page to evaluate additional alternatives and monthly workload fit.