Gemini 2.5 Flash Preview (09-2025) vs Grok 4 Fast >128k
Side-by-side comparison of pricing and capabilities
Gemini 2.5 Flash Preview (09-2025)
Grok 4 Fast >128k
Input Price Comparison
| Attribute | Gemini 2.5 Flash Preview (09-2025) | Grok 4 Fast >128k |
|---|---|---|
| Provider | xAI | |
| Input Price | $0.3 /1M tokens | $0.4 /1M tokens |
| Output Price | $2.5 /1M tokens | $1 /1M tokens |
| Cached Input | $0.030 /1M tokens | $0.050 /1M tokens |
| Context Window | 1.0M | 1.0M |
| Type | chat | chat |
| Status | preview | current |
Capability Comparison
| Capability | Gemini 2.5 Flash Preview (09-2025) | Grok 4 Fast >128k |
|---|---|---|
| coding | ||
| vision | ||
| multilingual |
Which should you choose?
Budget-conscious: Gemini 2.5 Flash Preview (09-2025) is 25% cheaper on input tokens ($0.3 vs $0.4 per 1M tokens).
Context-heavy tasks: Both models offer the same context window size.
Capability fit: Gemini 2.5 Flash Preview (09-2025) supports 3 capabilities (coding, vision, multilingual), while Grok 4 Fast >128k supports 1 (coding).
Frequently Asked Questions
Which is cheaper: Gemini 2.5 Flash Preview (09-2025) or Grok 4 Fast >128k?
Gemini 2.5 Flash Preview (09-2025) costs $0.3/1M input vs Grok 4 Fast >128k at $0.4/1M input. Gemini 2.5 Flash Preview (09-2025) is 25% cheaper on input tokens.
How do output prices compare between Gemini 2.5 Flash Preview (09-2025) and Grok 4 Fast >128k?
Gemini 2.5 Flash Preview (09-2025) output: $2.5/1M, Grok 4 Fast >128k output: $1/1M. Grok 4 Fast >128k is more economical for generation-heavy workloads.
What is Gemini 2.5 Flash Preview (09-2025) best used for?
Gemini 2.5 Flash Preview (09-2025) is best for budget-conscious applications, high-volume chatbots, and tasks where cost efficiency is the primary concern.
What is Grok 4 Fast >128k best used for?
Grok 4 Fast >128k is suited for complex reasoning, analysis, and tasks that benefit from its coding capabilities.