Gemini 2.5 Flash vs Grok 4.20 Beta Reasoning
Both have similar output pricing, while Grok 4.20 Beta Reasoning offers a larger context window. Choose Gemini 2.5 Flash or Grok 4.20 Beta Reasoning based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Gemini 2.5 Flash | Grok 4.20 Beta Reasoning |
|---|---|---|
| Provider | Vercel AI Gateway | |
| Input / 1M tokens | $0.30 | $1.25 |
| Output / 1M tokens | $2.50 | $2.50 |
| Context window | 1M | 2M |
| Parameters | — | — |
| Open weights | No | No |
| Released | Jun 2025 | Mar 2026 |
| FrontierMath score | 4.8 | — |
| SWE-bench Verified score | 28.7 | — |
| Epoch Capabilities Index score | 143 | — |
| LMArena (Chatbot Arena) Elo score | 1417 | — |
| LMArena Vision Elo score | 1235 | — |
FAQ
Is Gemini 2.5 Flash or Grok 4.20 Beta Reasoning cheaper?
Gemini 2.5 Flash and Grok 4.20 Beta Reasoning have comparable output pricing.
Which has the larger context window, Gemini 2.5 Flash or Grok 4.20 Beta Reasoning?
Grok 4.20 Beta Reasoning has the larger context window (2M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.