Gemini 2.5 Flash vs Grok 4
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
Gemini 2.5 Flash
Google · Jun 2025
The 2025 fast-tier favorite: hybrid reasoning, full multimodality and a 1M context at $0.30/$2.50.
Grok 4
xAI · Jul 2025
xAI's mid-2025 flagship, trained on the 200K-GPU Colossus cluster — a math and science reasoning standout of its generation.
The verdict
Grok 4 wins 1 of the 1 benchmarks these models share, against 0 for Gemini 2.5 Flash. On price the gap is dramatic: Gemini 2.5 Flash works out roughly 7.1x cheaper per blended million tokens. Gemini 2.5 Flash also takes 1.0M of context versus 256K for Grok 4.
Benchmark head-to-head 0–1
Specs & pricing
| Gemini 2.5 Flash | Grok 4 | |
|---|---|---|
| modhub Index | — | — |
| Input price / 1M | $0.3 | $3 |
| Output price / 1M | $2.5 | $15 |
| Context window | 1.0M | 256K |
| Max output | 66K | — |
| Open weights | no | no |
| Reasoning model | yes | yes |
| Multimodal input | text, image, audio, video | text, image |
| Knowledge cutoff | Jan 2025 | Jul 2025 |
| Released | Jun 2025 | Jul 2025 |
| Example monthly cost* | $6.75 | $52.50 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, Gemini 2.5 Flash or Grok 4?
- Grok 4 wins 1 of the 1 benchmarks these models share, against 0 for Gemini 2.5 Flash. On price the gap is dramatic: Gemini 2.5 Flash works out roughly 7.1x cheaper per blended million tokens. Gemini 2.5 Flash also takes 1.0M of context versus 256K for Grok 4.
- Which is cheaper, Gemini 2.5 Flash or Grok 4?
- Gemini 2.5 Flash costs $0.3/$2.5 per million input/output tokens, while Grok 4 costs $3/$15. For a typical workload of 10M input and 1.5M output tokens per month, that's $6.75 versus $52.50.
- Which model is better for coding, Gemini 2.5 Flash or Grok 4?
- We don't yet track SWE-bench Verified results for both models; check their individual pages for coding-related scores.