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-fast
Pricing updated Apr 24, 2026
Live Pricing
Input: $0.2000
Output: $0.5000
Last synced Apr 24, 2026 · MMLU score via public benchmark data
xAI: Grok 4 Fast offers a substantial context window of 2,000,000 tokens, making it ideal for applications requiring extensive text analysis, such as legal document review or large-scale content generation. With an input price of $0.20 per million tokens and an output price of $0.50 per million tokens, teams can effectively manage costs while leveraging the model for complex tasks that demand high token utilization. This pricing structure encourages efficient usage, allowing organizations to optimize their budget while benefiting from advanced AI capabilities.
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 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 Fast based on your workload.
Estimated Monthly Cost
$11
25M input + 12M output tokens
Quick links for cost-down decisions before production rollout.