Grok 4.20 vs Nano Banana 2 (Gemini 3.1 Flash Image Preview)
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for Grok 4.20 and Nano Banana 2 (Gemini 3.1 Flash Image Preview).
Grok 4.20
Grok 4.20 is a reasoning model from xAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering...
Nano Banana 2 (Gemini 3.1 Flash Image Preview)
Gemini 3.1 Flash Image Preview, a.k.a. "Nano Banana 2," is Google’s latest state of the art image generation and editing model, delivering Pro-level visual quality at Flash speed. It combines...
Technical Specifications
| Specification | Grok 4.20 | Nano Banana 2 (Gemini 3.1 Flash Image Preview) |
|---|---|---|
| Provider | xAI | |
| Context Window | 2,000,000 tokens | 131,072 tokens |
| Agent Suitability | N/A | N/A |
| Time to First Token (TTFT) | N/A | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | beta | stable |
| API Available | Yes | Yes |
| Released Date | 2026-03-31 | 2026-02-26 |
API Pricing Comparison
Input Price per Million Tokens
Grok 4.20
$1.25
Nano Banana 2 (Gemini 3.1 Flash Image Preview)
$0.50
Output Price per Million Tokens
Grok 4.20
$2.50
Nano Banana 2 (Gemini 3.1 Flash Image Preview)
$3.00
Want to test both models live?
Run side-by-side prompt prompts in our dynamic Sandbox. Check execution speeds, latency metrics, and compute actual costs in real-time.
Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
Grok 4.20 Quirks & Gotchas
No developer gotchas reported.
Nano Banana 2 (Gemini 3.1 Flash Image Preview) Quirks & Gotchas
No developer gotchas reported.