Gemini 3.1 Pro Preview
A Google model. 1 prices across 1 channels side by side, each with its source and check date – plus specs, licence, speed and benchmarks.
- Official in/out per 1M
- $2 / $12
- Lowest (official)
- $2 / $12
- Context
- 1.05M
- AA index
- 29.7
Prices checked 2026-10-10Official sources linked on every rowNo estimatesCheapest LLM APIs →
01Specs at a glance
Official values first; gaps filled from OpenRouter’s API where the vendor page is silent.
| Vendor | |
|---|---|
| Context window | 1.05M (1,048,576 tokens) |
| Max output | 66K |
| Input | Audio · File/PDF · Image · Text · Video |
| Output | Text |
| Tool calling / JSON | Yes / Yes |
| Weights & licence | Closed · Proprietary (API only) |
| Released | Feb 19, 2026 (OpenRouter listing date) |
| Model IDs | gemini-3.1-pro-preview |
02Prices on 1 channels
Per 1M tokens, in the currency each source publishes (1 USD = 6.7 CNY for the blended column). Sorted: official first, then cheapest.
| Channel | Source | Input | Output | Cache hit | Blended $ | Context | Notes |
|---|---|---|---|---|---|---|---|
| Official Vendor API, billed in USD | Official 10-10 | $2 | $12 | $0.2 | 4.5 | 1.05M | Batch −50%prompt>200K: 4/18 Batch -50%; free tier available on many models; prompt >200K: 4/18 |
“Official” = vendor pricing page; “Platform” = the platform’s own pricing page; “OpenRouter” = price listed on OpenRouter, not checked on the platform’s site. Click a source tag to open the original page.
03Where you can use it
Derived only from the price sources above. Country restrictions are set by each vendor – check their terms before you sign up.
- Vendor API, billed in USD
Official
04Performance
All results →Speed and AA index from Artificial Analysis public leaderboards (not our own tests); benchmark scores from our benchmark library, best result per benchmark.
- AA indexGemini 3.1 Pro Preview
- 29.7
- Output speed (median)
- 125 tok/s
- Time to first token
- 20.93s
- AA index per $ (blended)
- 6.6
Default TTFT includes thinking time at the highest reasoning setting; low-effort settings respond much faster.
| Benchmark | Best score | Source | Date |
|---|---|---|---|
| LMArena Text | 1487 | official | 2026-10-08 |
| LMArena WebDev | 1447 | official | 2026-10-08 |
| LMArena Vision | 1279 | official | 2026-10-02 |
| GPQA Diamond | 94.4% | independent | 2026-08-06 |
| MMLU-Pro | 91.2% | official | 2026-03-11 |
| SWE-bench Verified | 75.6% | independent | 2026-02-24 |
| AIME (OTIS Mock AIME 2024–2025) | 95.6% | independent | 2026-08-06 |
| Humanity's Last Exam | 46.4% | compiled | 2026-02-19 |
| τ²-bench | 26.0% | official | 2026-05-05 |
| Terminal-Bench 2.0 | 80.2% | official | 2026-02-19 |
05Price changes we recorded
All price changes →From our daily re-checks of the sources above.
No price change recorded since we started tracking (2026-10-10).
06More from Google
FAQ
How much does the Gemini 3.1 Pro Preview API cost?
On the official pricing page: $2 / $12 per 1M input / output tokens, cached input $0.2 (checked 2026-10-10).
What is the context window of Gemini 3.1 Pro Preview?
1.05M tokens of context, up to 66K output tokens. Platforms may cap it lower – see the table.
Is Gemini 3.1 Pro Preview open source?
No. It is only available through APIs and the vendor’s apps.