---
title: "Gemini 3.1 Pro Preview API: facts and benchmarks | Kendr"
canonical: "https://kendr.org/models/kc-gemini-3.1-pro-preview"
date_modified: "2026-08-12"
profile_kind: "hosted"
---

# Gemini 3.1 Pro Preview API model profile

Gemini 3.1 Pro Preview is a Google model profile with a 1,048,576-token context window. The dated catalog snapshot records audio, file, image, text, video modalities and interfaces for agentic, audio input, file input, prompt caching, reasoning.

Gemini 3.1 Pro Preview is available under the Kendr alias kc-gemini-3.1-pro-preview. Current account availability and customer credit quotes come from Kendr's live public model API and applicable account policy.

Gemini 3.1 Pro Preview accepts audio, file, image, text, and video and returns text. The snapshot records agentic, audio input, file input, prompt caching, reasoning, reasoning controls, structured output, text generation, tool calling, tools, video input, vision, web search, and web search pricing as capabilities or interfaces.

The dated reference snapshot lists $2 input and $12 output per million tokens. Cached input is $0.2 per million tokens. The separately published provider-route reference is $2 / $12 (≤200K input; $0.20/M cached).

The 2026-08-12 snapshot includes 3 Artificial Analysis indexes and 21 Design Arena categories. Publisher-reported launch results are labeled and are not presented as Kendr measurements; scores from different suites are not treated as interchangeable.

Gemini 3.1 Pro Preview ranked #43 in the cited trailing-7-day third-party catalog usage dataset as of 2026-08-12. Observed within the cited trailing-7-day third-party catalog usage dataset; this is not global AI market share.

Profile data was reviewed for the 2026-08-12 snapshot. Claims retain their source dates, and unavailable fields are shown as unavailable instead of estimated.

## Profile facts

- **Profile type:** Kendr API model
- **Kendr API alias:** kc-gemini-3.1-pro-preview
- **Model developer:** Google
- **Kendr route provider:** Google
- **Context window:** 1M
- **Snapshot date:** 2026-08-12
- **Reference catalog ID:** google/gemini-3.1-pro-preview

## Context, modalities, and identity

Gemini 3.1 Pro Preview accepts audio, file, image, text, and video and returns text. The snapshot records agentic, audio input, file input, prompt caching, reasoning, reasoning controls, structured output, text generation, tool calling, tools, video input, vision, web search, and web search pricing as capabilities or interfaces.

- **Model developer:** Google
- **Kendr route provider:** Google
- **Context window:** 1M
- **Maximum output:** 65,536 tokens
- **Input modalities:** audio, file, image, text, and video
- **Output modalities:** text
- **Knowledge cutoff:** Not disclosed

## Capabilities and supported controls

Capabilities and parameters are reported from the dated catalog and source records; their presence does not guarantee identical behavior across every provider route.

- **Supported parameters:** include_reasoning, max_tokens, reasoning, reasoning_effort, response_format, seed, stop, structured_outputs, temperature, tool_choice, tools, top_p

- agentic
- audio input
- file input
- prompt caching
- reasoning
- reasoning controls
- structured output
- text generation
- tool calling
- tools
- video input
- vision
- web search
- web search pricing

## Dated pricing snapshot

The dated reference snapshot lists $2 input and $12 output per million tokens. Cached input is $0.2 per million tokens. The separately published provider-route reference is $2 / $12 (≤200K input; $0.20/M cached).

Reference figures are dated 2026-08-12; the live Kendr quote can differ by selected provider route, context tier, caching, tools, region, and current rate card.

- **Price date:** 2026-08-12
- **Input:** $2 per 1M tokens
- **Cached input:** $0.2 per 1M tokens
- **Output:** $12 per 1M tokens

| Prompt threshold | Input | Cached input | Output |
| --- | --- | --- | --- |
| From 200,000 prompt tokens | $4 / 1M | $0.4 / 1M | $18 / 1M |

## Benchmark evidence and limitations

The 2026-08-12 snapshot includes 3 Artificial Analysis indexes and 21 Design Arena categories. Publisher-reported launch results are labeled and are not presented as Kendr measurements; scores from different suites are not treated as interchangeable.

Third-party catalog fields normalized from the cited model dataset; benchmark methodology and coverage differ by source.

- **Intelligence Index:** 47.7
- **Coding Index:** 68.8
- **Agentic Index:** 23

| Design Arena category | Elo | Win rate | Rank |
| --- | --- | --- | --- |
| agenticgamedev | 1121 | 44% | #17 |
| agentichtmlslides | 1226 | 55.8% | #5 |
| agenticslides | 1112 | 33.8% | #8 |
| agenticslides(html) | 1219 | 54.4% | #5 |
| agenticslides(python-pptx) | 1107 | 33.9% | #8 |
| androidnative | 1077 | 41.5% | #31 |
| fullstack | 1104 | 42.7% | #22 |
| godotgamedev | 1236 | 60% | #6 |
| htmlslides | 1206 | 51.7% | #12 |
| mobileapps | 1146 | 44.6% | #28 |
| pptxslides | 1110 | 34.1% | #8 |
| python-pptxslides | 1109 | 31.9% | #18 |
| webapps | 1166 | 46.4% | #24 |
| 3d | 1287 | 59.3% | #23 |
| asciiart | 1310 | 63.8% | #4 |
| codecategories | 1267 | 64.2% | #28 |
| dataviz | 1251 | 60.5% | #32 |
| gamedev | 1241 | 53.7% | #34 |
| svg | 1333 | 68.7% | #2 |
| uicomponent | 1300 | 68.1% | #16 |
| website | 1271 | 64.3% | #24 |

## Popularity and market context

Gemini 3.1 Pro Preview ranked #43 in the cited trailing-7-day third-party catalog usage dataset as of 2026-08-12. Observed within the cited trailing-7-day third-party catalog usage dataset; this is not global AI market share.

- **Third-party catalog rank:** #43
- **Global market share:** Not inferred
- **Observation date:** 2026-08-12

## OpenAI-compatible API example

```bash
curl https://api.kendr.org/v1/chat/completions \
  -H "Authorization: Bearer $KENDR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"kc-gemini-3.1-pro-preview","messages":[{"role":"user","content":"Hello"}]}'
```

## Frequently asked questions

### What is Gemini 3.1 Pro Preview?

Gemini 3.1 Pro Preview is a Google model profile with a 1,048,576-token context window. The dated catalog snapshot records audio, file, image, text, video modalities and interfaces for agentic, audio input, file input, prompt caching, reasoning.

### What context window does Gemini 3.1 Pro Preview have?

The dated profile lists 1M of context and up to 65,536 output tokens. Provider routes, variants, and runtime configuration can impose lower effective limits.

### What benchmark evidence is available for Gemini 3.1 Pro Preview?

The 2026-08-12 snapshot includes 3 Artificial Analysis indexes and 21 Design Arena categories. Publisher-reported launch results are labeled and are not presented as Kendr measurements; scores from different suites are not treated as interchangeable. Third-party catalog fields normalized from the cited model dataset; benchmark methodology and coverage differ by source.

### What is the Kendr API alias for Gemini 3.1 Pro Preview?

Use kc-gemini-3.1-pro-preview as the model value. The live public model API and signed-in catalog remain authoritative for route availability and customer credit quotes.

### How is Gemini 3.1 Pro Preview priced on Kendr?

The dated reference snapshot lists $2 input and $12 output per million tokens. Cached input is $0.2 per million tokens. The separately published provider-route reference is $2 / $12 (≤200K input; $0.20/M cached). Kendr applies one 5% markup to configured provider model cost; the live quote and settled routing receipt are authoritative for a request.

## Sources and evidence dates

- [Gemini 3.1 Pro Preview third-party catalog record](https://openrouter.ai/google/gemini-3.1-pro-preview) — catalog, checked 2026-08-12
- [Third-party model catalog methodology](https://openrouter.ai/docs/guides/overview/models) — methodology, checked 2026-08-12
- [Google official model documentation](https://ai.google.dev/gemini-api/docs/models) — primary, checked 2026-08-12
- [Artificial Analysis capability indices methodology](https://artificialanalysis.ai/methodology/capability-indices) — benchmark, checked 2026-08-12
- [Design Arena leaderboard and methodology](https://www.designarena.ai/leaderboard) — benchmark, checked 2026-08-12
- [Gemini 3.1 Pro Preview provider or route reference](https://ai.google.dev/gemini-api/docs/pricing) — primary, checked 2026-08-12

Live Kendr operational availability is published separately at https://api.kendr.org/api/public/models.