UI-Mate-27B GGUF

Community GGUF quantization of Tencent/UI-Mate-27B — an open-weight foundation GUI agent based on Qwen3.6-27B. It observes live screenshots, reasons over the visible state, and produces structured keyboard/mouse actions for native desktop interaction (pyautogui-compatible).

Converted with llama.cpp b10437 (convert_hf_to_gguf.py --no-nextn), quantized with llama-quantize (CUDA). The vision projector (mmproj) is included.

Files

File Size Notes
UI-Mate-27B-Q4_K_M.gguf 15.4 GB Recommended for 24 GB GPUs (RTX 3090/4090)
UI-Mate-27B-Q5_K_M.gguf 17.9 GB Middle ground; 24 GB GPUs
UI-Mate-27B-Q6_K.gguf 20.6 GB Highest fidelity; needs 24 GB+ with modest context
mmproj-UI-Mate-27B-F16.gguf 0.86 GB Vision projector — required for image input

Usage (llama.cpp)

Requires llama.cpp b10437+ (qwen3_5 / Gated DeltaNet support).

llama-server \
  -m UI-Mate-27B-Q4_K_M.gguf \
  --mmproj mmproj-UI-Mate-27B-F16.gguf \
  --ctx-size 65536 \
  --n-gpu-layers 999 \
  --image-min-tokens 1024 \
  --n-predict 8192

Works with any OpenAI-compatible client (llama.cpp server, llama-swap, LM Studio, etc.). For full GUI-agent behavior (structured actions, coordinate rescaling, demonstration-guided mode), use Tencent's UI-Mate harness against the endpoint.

Benchmarks (RTX 3090, CUDA, ngl 999)

Metric Q4_K_M
pp512 1341 t/s
tg128 42.3 t/s
VRAM (Q4_K_M + mmproj, 64K ctx) ~19.7 GB

Perplexity (wikitext-2, 10K tokens, ctx 512)

Quant PPL
Q4_K_M 6.5171 ± 0.216
Q5_K_M 6.4924 ± 0.216
Q6_K 6.4663 ± 0.214

Monotonic improvement with precision; Q6 is ~0.05 PPL better than Q4 — quantization loss is minimal.

Community Validation (llama.cpp / llama-swap)

Tested with Tencent's official UI-Mate harness against a llama.cpp b10437 server (llama-swap) on an RTX 3090 (24 GB).

  • Compatibility: llama.cpp accepts the harness's chat_template_kwargs.enable_thinking; the model emits both content (XML actions) and reasoning_content.
  • Single-step (5/5): all bundled examples produced valid <action> + <tool_call> output (e.g., Chrome bookmark → Ctrl+D hotkey; LibreOffice → File menu; Thunderbird → app icon).
  • Replay (5 steps): 2/5 exact match to recorded actions, 4/5 within 1–2 px.
  • Multi-turn: screenshot history + collapsing work correctly.

Note: Q4_K_M validated on 24 GB. Q6_K is provided for 24 GB+ GPUs (not GPU-validated on 24 GB).

Model Details (from the official card)

  • Parameters: 27B
  • Base model: Qwen3.6-27B
  • Input: task instruction, screenshots, interaction history, and optional demonstration context
  • Output: reasoning, a concise action description, and structured computer-use tool calls
  • Action space: mouse, keyboard, scrolling, waiting, user interaction, and task completion
  • Training: supervised fine-tuning followed by online reinforcement learning in executable GUI environments
  • License: Apache-2.0

UI-Mate supports two complementary modes:

  • General computer use: execute tasks from natural-language instructions and live screenshots.
  • Demonstration-guided computer use: adapt a reusable workflow extracted from one successful demonstration to a new task.

Evaluation (from the official card)

Instruction-only execution

Benchmark UI-Mate-27B
OSWorld-Verified · average score 77.0
WindowsAgentArena · average score 66.2
OSWorkerBench · strict success 41.00
OSWorkerBench · progress 76.86

Demonstration-guided execution (OSWorkerBench-Subset, 33 tasks)

Metric Instruction only + one demonstration
strict success 17.17 35.35 (+18.18 pp)
progress 67.85 81.14 (+13.29 pp)

Intended Use and Limitations

UI-Mate-27B is intended for research and development of screenshot-based GUI agents in controlled desktop environments. Its behavior can be affected by application versions, screen layouts, display scaling, latency, and unexpected UI state. Benchmark performance does not guarantee reliable execution in arbitrary environments, and the model requires an external runtime to execute its predicted actions.

Safety

Computer-use agents can make mistakes, encounter prompt injection, or trigger consequential actions.

  • Prefer isolated or disposable environments.
  • Avoid unattended, high-stakes, or destructive workflows.
  • Require human confirmation before sensitive operations.
  • Monitor the interaction trajectory and verify the resulting application state.
  • Do not treat a model-reported success as proof that the intended outcome was achieved.

Notes

  • Architecture: qwen35 (Qwen3.5-family Gated DeltaNet hybrid), 64 layers, hidden 5120, native 262K context. MTP head excluded from this conversion (--no-nextn).
  • Reasoning model: responses include reasoning_content before the final answer — set a generous max_tokens (e.g. 8192) for long-horizon tasks.
  • Grounding: --image-min-tokens 1024 is recommended for GUI grounding accuracy (llama.cpp warning for Qwen-VL models).
  • Original model: Apache-2.0. Third-party components retain their licenses.

Credits

Citation

@article{uimate2026,
  title   = {UI-Mate: Advancing Open-Weight Foundation GUI Agents with In-Context Demonstrations},
  author  = {{Tencent HY Frontier Multimodal Agent Team}},
  journal = {arXiv preprint},
  year    = {2026}
}
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