Gemini 3.5 Flash vs Grok 4 20 Non Reasoning
API pricing, context window and capabilities for Gemini 3.5 Flash and Grok 4 20 Non Reasoning, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersGemini 3.5 Flash wins on intelligence. Grok 4 20 Non Reasoning wins on price and on context window. Benchmark data is unavailable for one or both models.
Price
Grok 4 20 Non Reasoning
Terminal-Bench
Not called
Intelligence
Gemini 3.5 Flash
Context window
Grok 4 20 Non Reasoning
Key takeaways
who wins on what, from the published numbersGemini 3.5 Flash wins
- More serving providers (7 vs 5)
- Supports audio
Grok 4 20 Non Reasoning wins
- Cheaper input ($1.50 vs $1.25 /1M)
- Cheaper output ($9.00 vs $2.50 /1M)
- Larger context window (1M vs 2M)
- Higher max output (66K vs 2M)
Cheaper overall
Grok 4 20 Non Reasoning
$1.25 + $2.50 /1M
Larger context
Grok 4 20 Non Reasoning
2M
More providers
Gemini 3.5 Flash
7 providers
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower.
| Gemini 3.5 Flash | Grok 4 20 Non Reasoning | |
|---|---|---|
| Input $/1M | $1.50via Google | $1.25via xAI best |
| Output $/1M | $9.00via Google | $2.50via xAI best |
| Context window | 1M | 2M best |
| Max output | 66K | 2M best |
| Serving providers | 7 best | 5 |
| Date | Released May 22, 2026 | Released Mar 9, 2026 |
Benchmarks
Benchmark scores, side by side| Gemini 3.5 Flash | Grok 4 20 Non Reasoning | |
|---|---|---|
| Intelligence | 32.6 best | 14.2 |
| Terminal-Bench | 79% | Not available |
| GPQA Diamond | 92% best | 78% |
| Output speed | 197 t/s best | 94 t/s |
| Latency (TTFT) | 17.14s | 0.62s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Gemini 3.5 Flash
via OpenRouter
$17
Grok 4 20 Non Reasoning
via Azure
$8.75
Capabilities
feature support, side by side| Feature | Gemini 3.5 Flash | Grok 4 20 Non Reasoning |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | ✓ | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | ✓ |
Related comparisons
Frequently asked questions
Which is cheaper, Gemini 3.5 Flash or Grok 4 20 Non Reasoning?
Grok 4 20 Non Reasoning is cheaper for input ($1.50 vs $1.25 per 1M tokens) from xAI. Grok 4 20 Non Reasoning is cheaper for output ($9.00 vs $2.50 per 1M tokens) from xAI.
What is the context window difference between Gemini 3.5 Flash and Grok 4 20 Non Reasoning?
Gemini 3.5 Flash has a 1M-token context window and Grok 4 20 Non Reasoning has 2M tokens, so Grok 4 20 Non Reasoning can take a larger prompt.
How do Gemini 3.5 Flash and Grok 4 20 Non Reasoning compare on benchmarks?
On the tracked benchmarks, Gemini 3.5 Flash leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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