ByteDance: UI-TARS 7B is Bytedance's model. Its measured tokenizer sits with the Qwen group, which is evidence that it builds on the Qwen tokenizer. Tokenizer reuse is normal engineering, open vocabularies travel between labs, and this says nothing against Bytedance's authorship of the model itself.
| Signal | Result | Reference |
|---|---|---|
| Tokenizer signature | Exact match with 26 other models | tk_5410b38e |
| API surface | No other entry shares this exact contract | api_7c068b15 |
| Context and output | 128,000 context · 2,048 max output | declared |
| Reasoning contract | None declared | declared |
| Serving providers observed | Parasail | measured 21 August 2026 |
Click a row to open the full comparison.
An x marks a row excluded as corrupt (caching or provider interference detected during measurement). Overhead subtracted: 19 prompt tokens.
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...
Supported parameters
frequency_penaltylogit_biaslogprobsmax_tokenspresence_penaltyrepetition_penaltyseedstopstructured_outputstemperaturetop_ktop_logprobstop_p
defaults: {}
Cite this page as the evidence record for ByteDance: UI-TARS 7B : the URL is stable, measurements are dated, and revisions append to the history above. Method: tokenizer fingerprinting, v1, 50 strings. The raw data behind every figure is on the data page.
