tokevenGemini 3.5 Flash vs Grok 4.20 Reasoning
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Gemini 3.5 Flash
Fast / BudgetGrok 4.20 Reasoning
Mid-tierQuality
Task confidence comparison
Guidance
When to use Gemini 3.5 Flash vs Grok 4.20 Reasoning
Choose Gemini 3.5 Flash when...
- -You need a larger context window (1,048.576K vs 1,000K)
- Similar performance; consider provider preference or ecosystem fit.
Choose Grok 4.20 Reasoning when...
- -Cost matters: 17% cheaper on input tokens
At scale
Cost at scale
FAQ
When should I use Gemini 3.5 Flash instead of Grok 4.20 Reasoning?
Gemini 3.5 Flash and Grok 4.20 Reasoning perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is Grok 4.20 Reasoning cheaper than Gemini 3.5 Flash?
Yes. Grok 4.20 Reasoning input costs $1.25/MTok vs $1.50/MTok for Gemini 3.5 Flash, saving 17% on input.
What are the context window sizes for Gemini 3.5 Flash and Grok 4.20 Reasoning?
Gemini 3.5 Flash has a 1,048.576K token context window. Grok 4.20 Reasoning has a 1,000K token context window.
Go deeper on either model
Per-call cost calculators, provider lineups, and price history for both models on this page.
Other comparisons
How Gemini 3.5 Flash and Grok 4.20 Reasoning stack up against the rest of the field.
Track your real costs
Comparisons show estimated costs at list price. The dashboard reveals your real spend and savings.