grok-4-fast-reasoning
Specs & Pricing
API pricing per 1M tokens and core technical specificationsCost Calculator
Simulate estimated API usage cost based on your specific traffic and context sizeSimulation Results
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Alternative Models
Models with comparable benchmark score and pricing tier| Model | Provider | Context Window | Max Output | Training Cutoff | Input / 1M | Cache Price / 1M | Output / 1M | Benchmark | Speed | Total |
|---|---|---|---|---|---|---|---|---|---|---|
OpenAI👑 | 1M | 128K | 2026-04 | $0.10 | $0.01 | $0.50 | 89.5 | Blazing Fast | $0.0027 | |
xAI | 2M | - | - | $0.20 | $0.05 | $0.50 | 80.75 | Fast | $0.0040 | |
xAI | 2M | - | - | $0.20 | $0.05 | $0.50 | 73.25 | Blazing Fast | $0.0040 | |
xAI | 2M | - | - | $0.20 | $0.05 | $0.50 | 73.25 | Fast | $0.0040 | |
OpenAI | 128K | 16K | 2023-10 | $0.15 | $0.075 | $0.60 | 58.25 | Fast | $0.0040 |
Provider
Benchmark
89.5Speed
Blazing Fast
Training Cutoff
2026-04
Context Window
1M
Max Output
128K
Input / 1M
$0.10
Cache Price / 1M
$0.01
Output / 1M
$0.50
Provider
Benchmark
80.75Speed
Fast
Training Cutoff
-
Context Window
2M
Max Output
-
Input / 1M
$0.20
Cache Price / 1M
$0.05
Output / 1M
$0.50
Provider
Benchmark
73.25Speed
Blazing Fast
Training Cutoff
-
Context Window
2M
Max Output
-
Input / 1M
$0.20
Cache Price / 1M
$0.05
Output / 1M
$0.50
Provider
Benchmark
73.25Speed
Fast
Training Cutoff
-
Context Window
2M
Max Output
-
Input / 1M
$0.20
Cache Price / 1M
$0.05
Output / 1M
$0.50
Provider
Benchmark
58.25Speed
Fast
Training Cutoff
2023-10
Context Window
128K
Max Output
16K
Input / 1M
$0.15
Cache Price / 1M
$0.075
Output / 1M
$0.60
All AI Models Pricing & Cost Simulator
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grok-4-fast-reasoning Frequently Asked Questions (FAQ)
Key insights into grok-4-fast-reasoning API pricing, context capacity, caching savings, and performance benchmarks
Q. What is the API pricing for grok-4-fast-reasoning? How much does it cost per 1M tokens?＋
grok-4-fast-reasoning (xAI) is priced at $0.2000 per 1 million input tokens and $0.5000 per 1 million output tokens. The output rate is approximately 2.5x higher than the input rate. You can simulate your exact monthly API expenses tailored to your request volume and token length using the calculator above.
Q. What are the context window and maximum output limits of grok-4-fast-reasoning?＋
grok-4-fast-reasoning features a 2M context window and a maximum output limit of - tokens per request. This massive 1M+ context capacity allows you to process extensive document libraries or entire codebases in a single prompt.
Q. Does grok-4-fast-reasoning support Prompt Caching, and how much cost can be saved?＋
Yes, grok-4-fast-reasoning supports prompt caching. Cached reads cost $0.0500 per 1M tokens, delivering an estimated 75% discount compared to standard input rates. Caching reusable system instructions and documentation substantially lowers recurring API expenses.
Q. What is the benchmark score (80.25) and performance profile of grok-4-fast-reasoning?＋
grok-4-fast-reasoning achieves an overall benchmark score of 80.25/100 with a "Fast" speed rating. It strikes an optimal tradeoff between high analytical capability, speed, and affordability.
Q. Which alternative models are comparable to grok-4-fast-reasoning?＋
Key alternatives in similar price-to-performance tiers include GPT-6 Luna, grok-4-1-fast-reasoning, grok-4-1-fast-non-reasoning. We recommend comparing them based on your latency targets, context window needs, and prompt caching benefits using the full comparison tool on this site.