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MidTool
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Model Details
Model Provider
MidTool
Model Tree
MidTool/Arctic-MidTool-MT-8B
Input Modalities
Output Modalities
Supported Functionality
| 8B model | BFCLv3 Overall | τ²-Bench Pass@1 | MCP-Universe Score |
|---|---|---|---|
| Qwen3-8B (official) | 26.45 | 10.43 | 13.06 |
| Qwen3-8B-Base + SFT + RL | 45.79 | 17.63 | 15.67 |
| Arctic-MidTool-RL-8B | 55.12 | 21.31 | 25.16 |
Largest gains are on multi-turn BFCL (37.63 vs 29.25) and MCP-Universe, which stresses execution against real MCP servers.
Tool calls are emitted in the Qwen3 <tool_call> format; pass your schemas via the tools= argument of the chat template. Thinking mode is disabled in our evaluation setup.
Mid-trained on MidTool-Mix; see the dataset's LICENSE for data terms.
See our paper for the full data, training, and evaluation details.
bibtex
@article{jiang2026midtool,title = {MidTool: Mid-training Data Synthesis for Agentic Tool Use},author = {Jiang, Fengqing and Wang, Yite and Liu, Boyi and Wang, Zhaoyang andXu, Canwen and Yao, Zhewei and Poovendran, Radha and He, Yuxiong},year = {2026}}