# Hunyuan 4

Hunyuan 4 is Tencent's 770B-parameter mixture-of-experts model with 49B active parameters and the GA successor to Hunyuan 4 Preview, adding image understanding and stronger long-horizon agentic work. It has a one-million-token window of up to 960K input and 64K output, reasons at high effort by default, and can turn thinking off. Its published context window is 1,048,576 tokens. The advertised input rate is $0.417 per million input tokens. The advertised output rate is $1.2505 per million output tokens.

- Model identifier: ` tencent/hy4 `
- Creator: Tencent
- Providers: Tencent
- Model type: Text generation
- Canonical model page: [Hunyuan 4](<https://impossibl.com/tencent/hy4>)
- API availability: Listed as serving through Impossibl.
- Creator release date: 2026-11-04

## Providers

Tencent hosts Hunyuan 4. Impossibl routes your request intelligently and handles failover automatically when a provider is down.

| Provider | Endpoint location | Routes | Verified context window | Tool calling |
| --- | --- | --- | --- | --- |
| Tencent | Not specified | 1 | Not verified | Not verified |

The model price applies whichever provider serves the request. Endpoint locations do not guarantee inference residency.

## Specs and Capabilities

- Context window: 1,048,576 tokens
- Maximum output tokens: Not published in the public catalog; this is separate from the context window.
- Inputs: text, image
- Outputs: text
- Tool calling: Not published

## API access

Use ` tencent/hy4 ` as the model identifier through the Impossibl API.

Published API endpoints:

- ` /v1/chat/completions `

[API quickstart](<https://impossibl.com/docs/agent-quickstart>) · [Models and billing documentation](<https://impossibl.com/docs/models>)

## Published API prices

All rates are in USD. An unpublished rate is unknown, not zero. Workspace-specific pricing, taxes, balance-purchase fees, billing adjustments, and tool charges can affect the amount paid.

| Usage | Published base rate | Billing unit |
| --- | --- | --- |
| Input | $0.417 | per million input tokens |
| Output | $1.2505 | per million output tokens |
| Cache read | $0.021 | per million cached input tokens |
| Cache write (default retention) | Not published | per million tokens |
| Cache write (one-hour retention) | Not published | per million tokens |
| Audio input | Not published | per million audio input tokens |

## Availability and retirement

The model is listed as serving. No retirement is announced in the current public catalog.

## Frequently asked questions

### What is Hunyuan 4?

Hunyuan 4 is Tencent's 770B-parameter mixture-of-experts model with 49B active parameters and the GA successor to Hunyuan 4 Preview, adding image understanding and stronger long-horizon agentic work. It has a one-million-token window of up to 960K input and 64K output, reasons at high effort by default, and can turn thinking off.

Sources: [Tencent Hy4 release](<https://hy.tencent.com/research/hy4>); [Tencent Cloud TokenHub models](<https://www.tencentcloud.com/document/product/1300/78934>); [Tencent Cloud TokenHub pricing](<https://www.tencentcloud.com/document/product/1300/78937>)

### How much does Hunyuan 4 cost?

Hunyuan 4 costs $0.417 per million input tokens and $1.2505 per million output tokens through the Impossibl API. Cache reads cost $0.021 per million tokens. All rates are in USD.

### What is the context length of Hunyuan 4?

Hunyuan 4 has a 1,048,576-token context window through the Impossibl API.

### What inputs and outputs does Hunyuan 4 support?

Hunyuan 4 accepts text and image as input. Hunyuan 4 returns text.

### How do I use Hunyuan 4 through an API?

Hunyuan 4 is available through the Impossibl API. Use tencent/hy4 as the model identifier with /v1/chat/completions. The quickstart explains how to create an API key and send your first request.

### When was Hunyuan 4 released?

Tencent released Hunyuan 4 on November 4, 2026.

Sources: [Creator release announcement](<https://hy.tencent.com/research/hy4>)

## Sources and related links

Prices, limits, capabilities, endpoints, and availability come from the public Impossibl catalog. Creator documentation supplies descriptions and release dates where available; it does not override the published API offering.

- [Public Impossibl model catalog](<https://api.impossibl.com/v1/models>)
- [Full model directory as JSON](<https://impossibl.com/models.json>)
- [Hunyuan 4: model details and pricing](<https://impossibl.com/tencent/hy4>)
- [Model directory](<https://impossibl.com/models>)
- [Tencent Hy4 release](<https://hy.tencent.com/research/hy4>)
- [Tencent Cloud TokenHub models](<https://www.tencentcloud.com/document/product/1300/78934>)
- [Tencent Cloud TokenHub pricing](<https://www.tencentcloud.com/document/product/1300/78937>)