Grok 4 Fast Reasoning ≤128k vs Grok 4 Fast Reasoning >128k
Side-by-side comparison of pricing and capabilities
Grok 4 Fast Reasoning ≤128k
Grok 4 Fast Reasoning >128k
Input Price Comparison
| Attribute | Grok 4 Fast Reasoning ≤128k | Grok 4 Fast Reasoning >128k |
|---|---|---|
| Provider | xAI | xAI |
| Input Price | $0.2 /1M tokens | $0.4 /1M tokens |
| Output Price | $0.5 /1M tokens | $1 /1M tokens |
| Cached Input | $0.050 /1M tokens | $0.050 /1M tokens |
| Context Window | 131K | 1.0M |
| Type | reasoning | reasoning |
| Status | current | current |
Capability Comparison
| Capability | Grok 4 Fast Reasoning ≤128k | Grok 4 Fast Reasoning >128k |
|---|---|---|
| reasoning |
Which should you choose?
Budget-conscious: Grok 4 Fast Reasoning ≤128k is 50% cheaper on input tokens ($0.2 vs $0.4 per 1M tokens).
Context-heavy tasks: Grok 4 Fast Reasoning >128k offers a larger context window (1.0M vs 131K), making it better for long documents or conversations.
Capability fit: Grok 4 Fast Reasoning ≤128k supports 1 capabilities (reasoning), while Grok 4 Fast Reasoning >128k supports 1 (reasoning).
Frequently Asked Questions
Which is cheaper: Grok 4 Fast Reasoning ≤128k or Grok 4 Fast Reasoning >128k?
Grok 4 Fast Reasoning ≤128k costs $0.2/1M input vs Grok 4 Fast Reasoning >128k at $0.4/1M input. Grok 4 Fast Reasoning ≤128k is 50% cheaper on input tokens.
How do output prices compare between Grok 4 Fast Reasoning ≤128k and Grok 4 Fast Reasoning >128k?
Grok 4 Fast Reasoning ≤128k output: $0.5/1M, Grok 4 Fast Reasoning >128k output: $1/1M. Grok 4 Fast Reasoning ≤128k is more economical for generation-heavy workloads.
What is Grok 4 Fast Reasoning ≤128k best used for?
Grok 4 Fast Reasoning ≤128k is best for budget-conscious applications, high-volume chatbots, and tasks where cost efficiency is the primary concern.
What is Grok 4 Fast Reasoning >128k best used for?
Grok 4 Fast Reasoning >128k is suited for complex reasoning, analysis, and tasks that benefit from its reasoning capabilities.