Gemini 3.5 Flash vs Grok 4.3
API pricing, context window and capabilities for Gemini 3.5 Flash and Grok 4.3, 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 Terminal-Bench and on intelligence. Grok 4.3 wins on price.
Price
Grok 4.3
Terminal-Bench
Gemini 3.5 Flash
Intelligence
Gemini 3.5 Flash
Context window
Tied
Key takeaways
who wins on what, from the published numbersGemini 3.5 Flash wins
- More serving providers (7 vs 6)
- Supports audio
Grok 4.3 wins
- Cheaper input ($1.50 vs $1.25 /1M)
- Cheaper output ($9.00 vs $2.50 /1M)
- Higher max output (66K vs 1M)
Cheaper overall
Grok 4.3
$1.25 + $2.50 /1M
Larger context
Tied
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 4.3 | |
|---|---|---|
| Input $/1M | $1.50via Google | $1.25via xAI best |
| Output $/1M | $9.00via Google | $2.50via xAI best |
| Context window | 1M | 1M |
| Max output | 66K | 1M best |
| Serving providers | 7 best | 6 |
| Date | Released May 22, 2026 | Released Apr 18, 2026 |
Benchmarks
Benchmark scores, side by side| Gemini 3.5 Flash | Grok 4.3 | |
|---|---|---|
| Intelligence | 32.6 best | 24.9 |
| Terminal-Bench | 79% best | 40% |
| GPQA Diamond | 92% best | 90% |
| Output speed | 197 t/s best | 113 t/s |
| Latency (TTFT) | 17.14s best | 27.23s |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Gemini 3.5 Flash
via OpenRouter
$17
Grok 4.3
via OpenRouter
$8.75
Capabilities
feature support, side by side| Feature | Gemini 3.5 Flash | Grok 4.3 |
|---|---|---|
| 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 4.3?
Grok 4.3 is cheaper for input ($1.50 vs $1.25 per 1M tokens) from xAI. Grok 4.3 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 4.3?
Both Gemini 3.5 Flash and Grok 4.3 have about a 1M-token context window.
How do Gemini 3.5 Flash and Grok 4.3 compare on benchmarks?
On the tracked benchmarks, Gemini 3.5 Flash leads on Terminal-Bench, and Gemini 3.5 Flash leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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