Grok 4 Fast ≤128k vs Gemini 2.5 Flash
Side-by-side comparison of pricing and capabilities
Grok 4 Fast ≤128k
Gemini 2.5 Flash
Input Price Comparison
| Attribute | Grok 4 Fast ≤128k | Gemini 2.5 Flash |
|---|---|---|
| Provider | xAI | |
| Input Price | $0.2 /1M tokens | $0.3 /1M tokens |
| Output Price | $0.5 /1M tokens | $2.5 /1M tokens |
| Cached Input | $0.050 /1M tokens | $0.030 /1M tokens |
| Context Window | 131K | 1.0M |
| Type | chat | chat |
| Status | current | current |
Capability Comparison
| Capability | Grok 4 Fast ≤128k | Gemini 2.5 Flash |
|---|---|---|
| coding | ||
| vision | ||
| multilingual |
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: Gemini 2.5 Flash offers a larger context window (1.0M vs 131K), making it better for long documents or conversations.
Capability fit: Grok 4 Fast ≤128k supports 1 capabilities (coding), while Gemini 2.5 Flash supports 3 (coding, vision, multilingual).
Frequently Asked Questions
Which is cheaper: Grok 4 Fast ≤128k or Gemini 2.5 Flash?
Grok 4 Fast ≤128k costs $0.2/1M input vs Gemini 2.5 Flash 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 Gemini 2.5 Flash?
Grok 4 Fast ≤128k output: $0.5/1M, Gemini 2.5 Flash output: $2.5/1M. Grok 4 Fast ≤128k 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 Gemini 2.5 Flash best used for?
Gemini 2.5 Flash is suited for complex reasoning, analysis, and tasks that benefit from its coding and vision capabilities.