Gemini 3.1 Pro Preview vs Mercury 2
API pricing, context window and capabilities for Gemini 3.1 Pro Preview and Mercury 2, 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 intelligence and on context window. Mercury 2 wins on price. Benchmark data is unavailable for one or both models.
Price
Mercury 2
Coding
Not called
Intelligence
Gemini 3.1 Pro Preview
Context window
Gemini 3.1 Pro Preview
Key takeaways
who wins on what, from the published numbersGemini 3.1 Pro Preview wins
- Larger context window (1M vs 128K)
- Higher max output (66K vs 50K)
- More serving providers (4 vs 1)
- Supports vision
- Has reasoning mode
- Supports audio
- Has web search
Mercury 2 wins
- Cheaper input ($2.00 vs $0.25 /1M)
- Cheaper output ($12.00 vs $0.75 /1M)
Cheaper overall
Mercury 2
$0.25 + $0.75 /1M
Larger context
Gemini 3.1 Pro Preview
1M
More providers
Gemini 3.1 Pro Preview
4 providers
Pricing & specs
cheapest serving route · per 1M tokens| Gemini 3.1 Pro Preview | Mercury 2 | |
|---|---|---|
| Input $/1M | $2.00 | $0.25 best |
| Output $/1M | $12.00 | $0.75 best |
| Context window | 1M best | 128K |
| Max output | 66K best | 50K |
| Serving providers | 4 best | 1 |
| Released | 2026-02-19 | 2026-02-24 |
Benchmarks
Artificial Analysis indices, side by side| Gemini 3.1 Pro Preview | Mercury 2 | |
|---|---|---|
| Intelligence | 46.5 best | 25.3 |
| Coding | 68.8 | Not available |
| GPQA Diamond | 94% best | 77% |
| Output speed | 154 t/s | 602 t/s best |
| Latency (TTFT) | 34.98s | 2.73s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Gemini 3.1 Pro Preview
via Vertex AI
$22
Mercury 2
via Inception
$2.00
Capabilities
feature support, side by side| Feature | Gemini 3.1 Pro Preview | Mercury 2 |
|---|---|---|
| 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 Mercury 2?
Mercury 2 is cheaper for input ($2.00 vs $0.25 per 1M tokens). Mercury 2 is cheaper for output ($12.00 vs $0.75 per 1M tokens).
What is the context window difference between Gemini 3.1 Pro Preview and Mercury 2?
Gemini 3.1 Pro Preview has a 1M-token context window and Mercury 2 has 128K tokens, so Gemini 3.1 Pro Preview can take a larger prompt.
How do Gemini 3.1 Pro Preview and Mercury 2 compare on benchmarks?
On the tracked Artificial Analysis indices, Gemini 3.1 Pro Preview leads on intelligence.
Pricing verified against LiteLLM + OpenRouter + provider pages · refreshed daily
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