Grok 4 Fast ≤128k vs Grok 3 Mini
Side-by-side comparison of pricing and capabilities
Grok 4 Fast ≤128k
Grok 3 Mini
Input Price Comparison
| Attribute | Grok 4 Fast ≤128k | Grok 3 Mini |
|---|---|---|
| Provider | xAI | xAI |
| Input Price | $0.2 /1M tokens | $0.3 /1M tokens |
| Output Price | $0.5 /1M tokens | $0.5 /1M tokens |
| Cached Input | $0.050 /1M tokens | $0.075 /1M tokens |
| Context Window | 131K | 131K |
| Type | chat | chat |
| Status | current | current |
Capability Comparison
| Capability | Grok 4 Fast ≤128k | Grok 3 Mini |
|---|---|---|
| coding | ||
| reasoning |
Which should you choose?
Budget-conscious: Grok 4 Fast ≤128k is 33% cheaper on input tokens ($0.2 vs $0.3 per 1M tokens).
Context-heavy tasks: Both models offer the same context window size.
Capability fit: Grok 4 Fast ≤128k supports 1 capabilities (coding), while Grok 3 Mini supports 2 (reasoning, coding).
Frequently Asked Questions
Which is cheaper: Grok 4 Fast ≤128k or Grok 3 Mini?
Grok 4 Fast ≤128k costs $0.2/1M input vs Grok 3 Mini at $0.3/1M input. Grok 4 Fast ≤128k is 33% cheaper on input tokens.
How do output prices compare between Grok 4 Fast ≤128k and Grok 3 Mini?
Grok 4 Fast ≤128k output: $0.5/1M, Grok 3 Mini output: $0.5/1M. Grok 3 Mini is more economical for generation-heavy workloads.
What is Grok 4 Fast ≤128k best used for?
Grok 4 Fast ≤128k is best for budget-conscious applications, high-volume chatbots, and tasks where cost efficiency is the primary concern.
What is Grok 3 Mini best used for?
Grok 3 Mini is suited for complex reasoning, analysis, and tasks that benefit from its reasoning and coding capabilities.