Gemini 3.1 Pro Preview vs Gemini 3 Pro Preview
Too close to call on our weighted score (Gemini 3.1 Pro Preview 68, Gemini 3 Pro Preview 67). The right pick depends on what you value most.
GoogleGemini 3.1 Pro Preview
68/100- ECI154.8
- Price$2.00 / $12.00
- Context1.05M
- Google
Gemini 3 Pro Preview
67/100- ECI153.0
- Price$2.00 / $12.00
- Context1.05M
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Make it a three-way comparison.
Too close to call
It is close. Our weighted score puts them within 1 points (Gemini 3.1 Pro Preview 68/100, Gemini 3 Pro Preview 67/100), so choose by what matters most for your work: Gemini 3.1 Pro Preview for raw capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
- CapabilityGemini 3.1 Pro PreviewCapabilities Index (ECI): Gemini 3.1 Pro Preview 154.8 · Gemini 3 Pro Preview 153.0
- Lowest priceSame priceGemini 3.1 Pro Preview $4.50 · Gemini 3 Pro Preview $4.50 per 1M tokens (3:1 blend)
- Longest contextAbout the sameGemini 3.1 Pro Preview 1,048,576 · Gemini 3 Pro Preview 1,048,576 tokens
- Widest inputsSame inputsGemini 3.1 Pro Preview: Text, Images, PDFs, Audio, Video · Gemini 3 Pro Preview: Text, Images, PDFs, Audio, Video
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | Gemini 3.1 Pro Preview | Gemini 3 Pro Preview |
|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 50% | 84 | 82 |
| Price | 25% | 19 | 19 |
| Inputs & features | 15% | 100 | 100 |
| Context window | 10% | 61 | 61 |
| Overall | 100% | 68/100 | 67/100 |
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Gemini 3.1 Pro PreviewGoogle | Gemini 3 Pro PreviewGoogle |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | 154.8 (best) | 153.0 |
| ECI rank | #31 of 148 (best) | #39 of 148 |
| GPQA DiamondGraduate-level science questions | 94.4% (best) | 92.6% |
| FrontierMath Tiers 1–3Research-level mathematics | 59.7% | — |
| OTIS Mock AIME 2024–2025Competition mathematics | 95.6% (best) | 91.4% |
| SWE-bench VerifiedFixing real GitHub issues | 75.6% (best) | 72.9% |
| SimpleQA VerifiedShort factual questions | 73.5% | — |
| Price per million tokens | ||
| Input | $2.00 | $2.00 |
| Output | $12.00 | $12.00 |
| Cached input | $0.20 | — |
| Blended (3:1) | $4.50 | $4.50 |
| Long-context rate | Over 200K: $4.00 / $18.00 | Same rate |
| Price source | Official Google API | Median of 2 providers |
| Limits | ||
| Context window | 1,048,576 tokens | 1,048,576 tokens |
| Max output | 65,536 tokens | 65,536 tokens |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | Yes | Yes |
| Audio | Yes | Yes |
| Video | Yes | Yes |
| Reasoning | Yeslow · medium · high | Yes |
| Tool calling | Yes | Yes |
| Structured output | Yes | Yes |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | gemini-3.1-pro-preview | — |
| API providers | 26 (best) | 3 |
| Released | Feb 19, 2026 | Nov 18, 2025 |
| Knowledge cutoff | Jan 2025 | Jan 2025 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Gemini 3.1 Pro Preview$44.00
- Gemini 3 Pro Preview$44.00
Which should you choose?
Which is better: Gemini 3.1 Pro Preview or Gemini 3 Pro Preview?
It is close. Our weighted score puts them within 1 points (Gemini 3.1 Pro Preview 68/100, Gemini 3 Pro Preview 67/100), so choose by what matters most for your work: Gemini 3.1 Pro Preview for raw capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
Which is cheaper, Gemini 3.1 Pro Preview or Gemini 3 Pro Preview?
Gemini 3.1 Pro Preview and Gemini 3 Pro Preview cost the same: $2.00 input / $12.00 output per million tokens.
Which scores higher on benchmarks?
Gemini 3.1 Pro Preview scores higher on the Capabilities Index (ECI): Gemini 3.1 Pro Preview 154.8 (#31 of 148) and Gemini 3 Pro Preview 153.0 (#39 of 148). The confidence ranges of the top two overlap (152.6–157.3 vs 150.6–155.2), so treat the gap as small. On individual benchmarks: GPQA Diamond — Gemini 3.1 Pro Preview 94.4%, Gemini 3 Pro Preview 92.6%; OTIS Mock AIME 2024–2025 — Gemini 3.1 Pro Preview 95.6%, Gemini 3 Pro Preview 91.4%; SWE-bench Verified — Gemini 3.1 Pro Preview 75.6%, Gemini 3 Pro Preview 72.9%.
Which is better for coding?
Gemini 3.1 Pro Preview resolves more real GitHub issues on SWE-bench Verified: Gemini 3.1 Pro Preview 75.6% and Gemini 3 Pro Preview 72.9%. Both support tool calling for agent workflows.
Which has the bigger context window?
Gemini 3.1 Pro Preview and Gemini 3 Pro Preview share the same 1,048,576-token context window. Maximum output per response: Gemini 3.1 Pro Preview up to 65,536, Gemini 3 Pro Preview up to 65,536 tokens.
Which can read images, PDFs, audio or video?
Gemini 3.1 Pro Preview accepts text, images, PDFs, audio and video; Gemini 3 Pro Preview accepts text, images, PDFs, audio and video. They handle the same number of input types.
Are any of these open source?
No. Gemini 3.1 Pro Preview and Gemini 3 Pro Preview are proprietary and only available through APIs and apps.
Which is newer?
Gemini 3.1 Pro Preview is the newest, released Feb 19, 2026. Gemini 3 Pro Preview came out Nov 18, 2025. Knowledge cutoff: Gemini 3.1 Pro Preview Jan 2025, Gemini 3 Pro Preview Jan 2025.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.
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