UI-TARS 7B
Summary
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.
UI-TARS-1.5 is a multimodal vision-language agent optimized for GUI-based environments, including desktop interfaces, web browsers, mobile systems, and games. Built by ByteDance, it builds upon the UI-TARS framework with reinforcement...
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | Bytedance |
|---|---|
| Release date | 22 Jul 2025 [OpenRouter] |
| Status | Generally available |
| Weights | Open weights [Hugging Face] |
| License | apache-2.0 [Hugging Face] |
| Parameters | 8.3B [Hugging Face] |
| Context window | 128K (128,000 tokens) [OpenRouter] |
| Max output | 2K tokens [OpenRouter] |
| Knowledge cutoff | 31 Jan 2025 [OpenRouter] |
| Input | Images and text [OpenRouter] |
| Output | Text [OpenRouter] |
| Reasoning mode | No [OpenRouter] |
| Tool calling | No [OpenRouter] |
| Structured output | Yes [OpenRouter] |
| Hugging Face | ByteDance-Seed/UI-TARS-1.5-7B [Hugging Face] |
UI-TARS 7B API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenRouter bytedance/ui-tars-1.5-7b | $0.10 | $0.20 | $0.10 | 128K | OpenRouter, 4 Oct 2026 |
Frequently asked questions
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.
Change history
No changes detected since we started tracking this model. We re-check every source daily.