Gemini 3.1 Pro Preview vs GPT-5.5
API pricing, context window and capabilities for Gemini 3.1 Pro Preview and GPT-5.5, side by side. Prices are the cheapest serving route per 1M tokens, verified against LiteLLM and OpenRouter.
Verdict
computed from the published numbersGemini 3.1 Pro Preview wins on price. GPT-5.5 wins on coding, on intelligence and on context window.
Price
Gemini 3.1 Pro Preview
Coding
GPT-5.5
Intelligence
GPT-5.5
Context window
GPT-5.5
Key takeaways
who wins on what, from the published numbersGemini 3.1 Pro Preview wins
- Cheaper input ($2.00 vs $5.00 /1M)
- Cheaper output ($12.00 vs $30.00 /1M)
- More serving providers (4 vs 2)
- Supports audio
GPT-5.5 wins
- Larger context window (1M vs 1.1M)
- Higher max output (66K vs 128K)
Cheaper overall
Gemini 3.1 Pro Preview
$2.00 + $12.00 /1M
Larger context
GPT-5.5
1.1M
More providers
Gemini 3.1 Pro Preview
4 providers
Pricing & specs
cheapest serving route · per 1M tokens| Gemini 3.1 Pro Preview | GPT-5.5 | |
|---|---|---|
| Input $/1M | $2.00 best | $5.00 |
| Output $/1M | $12.00 best | $30.00 |
| Context window | 1M | 1.1M best |
| Max output | 66K | 128K best |
| Serving providers | 4 best | 2 |
| Released | 2026-02-19 | 2026-04-23 |
Benchmarks
Artificial Analysis indices, side by side| Gemini 3.1 Pro Preview | GPT-5.5 | |
|---|---|---|
| Intelligence | 46.5 | 54.8 best |
| Coding | 68.8 | 74.9 best |
| GPQA Diamond | 94% | 94% |
| Output speed | 154 t/s best | 87 t/s |
| Latency (TTFT) | 34.98s | 23.21s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Gemini 3.1 Pro Preview
via Vertex AI
$22
GPT-5.5
via Azure
$55
Capabilities
feature support, side by side| Feature | Gemini 3.1 Pro Preview | GPT-5.5 |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | ✓ | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | ✓ |
Related comparisons
Frequently asked questions
Which is cheaper, Gemini 3.1 Pro Preview or GPT-5.5?
Gemini 3.1 Pro Preview is cheaper for input ($2.00 vs $5.00 per 1M tokens). Gemini 3.1 Pro Preview is cheaper for output ($12.00 vs $30.00 per 1M tokens).
What is the context window difference between Gemini 3.1 Pro Preview and GPT-5.5?
Gemini 3.1 Pro Preview has a 1M-token context window and GPT-5.5 has 1.1M tokens, so GPT-5.5 can take a larger prompt.
How do Gemini 3.1 Pro Preview and GPT-5.5 compare on benchmarks?
On the tracked Artificial Analysis indices, GPT-5.5 leads on coding, and GPT-5.5 leads on intelligence.
Pricing verified against LiteLLM + OpenRouter + provider pages · refreshed daily
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