# UI-TARS 7B

> UI-TARS 7B is an open-weight language model from Bytedance, released on 22 Jul 2025. It accepts images and text and generates text, with a 128K-token context window and up to 2K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $0.10 per million input tokens and $0.20 per million output tokens (OpenRouter), across 1 provider we track.

Source page: https://www.aimodel.directory/models/ui-tars-1-5-7b
Last verified: 4 Oct 2026

## Specifications

- **Developer:** Bytedance
- **Release date:** 22 Jul 2025 (source: OpenRouter, https://openrouter.ai/bytedance/ui-tars-1.5-7b)
- **Status:** Generally available
- **Weights:** Open weights (source: Hugging Face, https://huggingface.co/ByteDance-Seed/UI-TARS-1.5-7B)
- **License:** apache-2.0 (source: Hugging Face, https://huggingface.co/ByteDance-Seed/UI-TARS-1.5-7B)
- **Parameters:** 8.3B (source: Hugging Face, https://huggingface.co/ByteDance-Seed/UI-TARS-1.5-7B)
- **Context window:** 128K (128,000 tokens) (source: OpenRouter, https://openrouter.ai/bytedance/ui-tars-1.5-7b)
- **Max output:** 2K tokens (source: OpenRouter, https://openrouter.ai/bytedance/ui-tars-1.5-7b)
- **Knowledge cutoff:** 31 Jan 2025 (source: OpenRouter, https://openrouter.ai/bytedance/ui-tars-1.5-7b)
- **Input:** Images and text (source: OpenRouter, https://openrouter.ai/bytedance/ui-tars-1.5-7b)
- **Output:** Text (source: OpenRouter, https://openrouter.ai/bytedance/ui-tars-1.5-7b)
- **Reasoning mode:** No (source: OpenRouter, https://openrouter.ai/bytedance/ui-tars-1.5-7b)
- **Tool calling:** No (source: OpenRouter, https://openrouter.ai/bytedance/ui-tars-1.5-7b)
- **Structured output:** Yes (source: OpenRouter, https://openrouter.ai/bytedance/ui-tars-1.5-7b)
- **Hugging Face:** ByteDance-Seed/UI-TARS-1.5-7B (source: Hugging Face, https://huggingface.co/ByteDance-Seed/UI-TARS-1.5-7B)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| OpenRouter | $0.10 | $0.20 | $0.10 | 128K |

## FAQ

### What is the context window of UI-TARS 7B?

UI-TARS 7B has a context window of 128,000 tokens (128K) and can generate up to 2,048 tokens in a single response, according to OpenRouter.

### How much does the UI-TARS 7B API cost?

UI-TARS 7B is listed from $0.10 per million input tokens and $0.20 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.

### Is UI-TARS 7B open source?

UI-TARS 7B is an open-weight model: its weights are published on Hugging Face as ByteDance-Seed/UI-TARS-1.5-7B under the apache-2.0 license. Check the license terms before commercial use.

### When was UI-TARS 7B released?

Bytedance released UI-TARS 7B on 22 Jul 2025, according to OpenRouter.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "UI-TARS 7B", https://www.aimodel.directory/models/ui-tars-1-5-7b