Context Window
2,000,000
Input tokens
Full-context input ≈ $0.40
Model Cost Profile
Developer: x-ai· Tokenizer: Grok · Quantization: unknown
Canonical ID: x-ai/grok-4.1-fast
Pricing updated Apr 25, 2026
Live Pricing
Input: $0.2000
Output: $0.5000
Last synced Apr 25, 2026 · MMLU score via public benchmark data
xAI: Grok 4.1 Fast is designed for applications requiring extensive context handling, with a remarkable context window of 2,000,000 tokens, making it suitable for complex document analysis and large-scale data processing. Teams leveraging this API model can expect an input cost of $0.20 per million tokens and an output cost of $0.50 per million tokens, allowing for budget planning based on token usage. This model is particularly beneficial for businesses in sectors such as legal, research, and content creation, where comprehensive context and detailed output are essential for informed decision-making.
Context Window
2,000,000
Input tokens
Full-context input ≈ $0.40
Max Output
30,000
Completion tokens
Input Price / 1M
$0.2000
Prompt tokens
Output Price / 1M
$0.5000
Completion tokens
Top Benchmark
74.3
MMLU score — highest of MMLU, GPQA, MATH, HumanEval
Evaluation scores for xAI: Grok 4.1 Fast. The “Top Benchmark” shown above is the highest score across MMLU, GPQA, MATH & HumanEval.
Price History
Current Input / 1M
$0.2000
Current Output / 1M
$0.5000
Performance History
Current TPS
0.00
Current Latency
0ms
Uptime
100.0%
| Usage Type | Price / 1M Tokens |
|---|---|
| Input (Prompt) | $0.2000 |
| Output (Completion) | $0.5000 |
| Cache Read | $0.0500 |
| Web Search | $5,000.00 |
Estimate monthly spend for xAI: Grok 4.1 Fast based on your workload.
Estimated Monthly Cost
$11
25M input + 12M output tokens
Quick links for cost-down decisions before production rollout.