OPEN
Qwen3.5-4B-Router-1M decision model
Qwen3.5-4B-Router-1M is an open adapter for agent tool and action routing. See the actual training size, source-label results and trace-judging limits.
By Maziyar Panahi · Weights upload: 6 Nov 2026
A Qwen3.5-4B LoRA and Unsloth decision head for next-action and tool routing. Training used 17,600 source-labelled rows; the name refers to the larger merged data pool. Jev answers were excluded from training. It is unsuitable as a general trace judge.
Quick answers
What is Qwen3.5-4B-Router-1M by Maziyar Panahi?
Qwen3.5-4B-Router-1M: A Qwen3.5-4B LoRA and Unsloth decision head for next-action and tool routing.
Who makes Qwen3.5-4B-Router-1M?
Qwen3.5-4B-Router-1M: Maziyar Panahi
Facts
- Base and size
- Qwen3.5-4B; adapter and separate decision head
- Inputs
- Software-agent and customer-service traces
- Context
- 4,096 tokens; reported test states up to 13,000 characters
- Licence
- Apache-2.0
- Access
- Public adapter; Unsloth FastDecisionModel and base weights required
Claims and sources
- The maker reports 86.5% agreement with source labels on 480 held-out rows, against stored Jev 1.13 answers at 80.6%. These labels describe the source trace’s next action or parsed tool call, not human correctness. Trace-disposition results are weak. vendor reportedsource
Links
Source: Model card and weights →
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