Triumvirate-Qwopus-MiMo-Ornith-9B-Coder

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Most sub-10B coding models crumble the moment they enter real-world agentic workflows: they either produce clean code but loop endlessly when a shell command fails, or handle tool calls reasonably well while hallucinating obscure API syntax.

Triumvirate is a merge designed to solve that dilemma. It combines three of the most capable specialized fine-tunes of Qwen 3.5 9B and fuses their task vectors directly into the base backbone:

• Algorithmic & Syntax Precision from Qwopus
• SWE-bench Problem Decomposition & Tool Calling from MiMo-V2.6
• Loop-Termination & Error-Recovery Discipline from Ornith-1.5

[!IMPORTANT] The result is a lean, blisteringly fast 9B pure-text causal engine with a native 256k context window that runs comfortably on consumer GPUs.

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Contents

• Architectural Specifications
• Composition & Donor Weighting
• Merge Methodology & Mathematical Formulation
• Layer-Stratified Component Policies
• Agentic Chat Template
• Recommended Generation Parameters
• How to Use
• Citation & References

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Architectural Specifications

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Composition & Donor Weighting

The foundation checkpoint serves as the structural base (W₀). Three donor models contribute directional task vectors weighted continuously across network depth:

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Merge Methodology & Mathematical Formulation

The merge combines TIES-DELLA saliency trimming, consensus sign election, Gated DeltaNet norm stabilization, and continuous sinusoidal depth modulation.

1. Task Vector Formulation

For each donor checkpoint k ∈ {1, 2, 3}, the parameter update delta is isolated relative to the base anchor W₀:

$$ \tau_k = D_k - W_0, \quad k \in {\text{MiMo}, \text{Ornith}, \text{Qwopus}} $$

2. Asymmetric Sinusoidal Depth Modulation

Task vector mixing coefficients are continuously parameterized over normalized network depth x = l / (L - 1), where l ∈ {0, 1, ..., 31} and L = 32:

$$ u_{\text{qwopus}}(x) = 0.45 \cos^2\left(\frac{\pi}{2} x\right) + 0.25 $$

$$ u_{\text{ornith}}(x) = 0.35 \sin^2\left(\pi x^{0.85}\right) + 0.15 $$

$$ u_{\text{mimo}}(x) = 0.55 \sin^2\left(\frac{\pi}{2} x^{1.20}\right) + 0.20 $$

The donor weights α_k(l) are normalized to form a partition of unity across all layers:

$$ \alpha_k(l) = \frac{u_k(x)}{\sum_{j=1}^3 u_j(x)}, \quad \sum_{k=1}^3 \alpha_k(l) = 1.0 $$

• Lower Layers (x → 0): Qwopus dominates with α₁(0) ≈ 0.67, ensuring foundational language representations and syntax heads are grounded in Claude 3.5 Opus traces.
• Middle Layers (x ≈ 0.5): The sub-linear exponent (x^0.85) accelerates Ornith's activation to peak across middle transformer blocks with α₂(16) ≈ 0.354, reinforcing state-space continuity and execution discipline.
• Top Layers (x → 1): The super-linear exponent (x^1.20) concentrates MiMo's task vector with α₃(31) ≈ 0.652 into the upper decoders, governing semantic reasoning, multi-turn planning, and final token synthesis.

3. Saliency Trimming (TIES-DELLA Pruning)

To eliminate parameter interference and cross-talk, task vectors are pruned based on parameter energy. Given density parameter ρ = 0.70, an update threshold γ_k is computed per tensor:

$$ \gamma_k = \text{Quantile}{1 - \rho}\left({|\tau{k, ij}|}\right) $$

Updates below the top 70% magnitude are zeroed out via a saliency mask:

$$ M_k = \mathbb{I}\left(|\tau_k| \ge \gamma_k\right) $$

$$ \hat{\tau}_k = \tau_k \odot M_k $$

4. Consensus Sign Election & Disjoint Averaging

Surviving task vectors often conflict in directional signs, causing mutual cancellation when averaged naively. A directional consensus sign vector Γ is elected:

$$ \Gamma = \operatorname{sgn}\left(\sum_{k=1}^3 \alpha_k(l) \hat{\tau}_k\right) $$

A binary agreement mask A_k discards parameter updates that oppose the elected consensus sign:

$$ A_k = \mathbb{I}\left(\operatorname{sgn}(\hat{\tau}_k) = \Gamma\right) \odot \mathbb{I}\left(\hat{\tau}_k \neq 0\right) $$

The merged task delta is reconstructed using only parameters aligned with the majority direction:

$$ \Delta_{\text{TIES}} = \begin{cases} \frac{\sum_{k=1}^3 \alpha_k(l) \left(\hat{\tau}k \odot A_k\right)}{\sum{k=1}^3 \alpha_k(l) A_k} & \text{if } \sum_{k=1}^3 \alpha_k(l) A_k > 0 \ 0 & \text{otherwise} \end{cases} $$

The dense layer weights are restored onto the base foundation:

$$ W_{\text{dense}} = W_0 + \Delta_{\text{TIES}} $$

5. Gated DeltaNet (GDN) Gate Norm Stabilization

In linear attention layers, gate matrices control state retention and output gating via non-linear sigmoid activations. Direct delta merging shifts the operator norm, causing activation saturation or exploding outputs. To guarantee numerical stability, the merged gate weight W_{gate, unscaled} = W₀ + ∑_k α_k τ_k is projected onto the base tensor's Frobenius norm:

$$ W_{\text{gate}} = W_{\text{gate, unscaled}} \cdot \frac{|W_0|F}{|W{\text{gate, unscaled}}|_F} $$

6. Log-Decay and Normalization Parameter Convexity

For state-space logarithmic decay tensors (A_log ∈ (-∞, 0]), biases, and layer normalization parameters, delta blending can violate mathematical boundary constraints. These tensors are merged strictly via convex interpolation:

$$ W_{\text{convex}} = \sum_{k=1}^3 \alpha_k(l) D_k $$

Because ∑_k α_k(l) = 1.0, α_k(l) ≥ 0, and D_{k, ij} ≤ 0 for all decay parameters:

$$ \sum_{k=1}^3 \alpha_k(l) D_{k, ij} \le \max_k(D_{k, ij}) \le 0 \implies \exp\left(W_{\text{convex}, ij}\right) \in (0, 1] $$

This guarantees Bounded-Input Bounded-Output (BIBO) stability and prevents exponential divergence in recurrent linear attention states.

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Layer-Stratified Component Policies

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Agentic Chat Template

This model uses the Improved Chat Template for Qwen 3.x by Olivia Rossi to support multi-tier Chain-of-Thought (CoT) reasoning, dual-format agentic tool execution, automatic error-recovery heuristics, and strict token-waste elimination.

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Recommended Generation Parameters

The following parameters are optimal for code synthesis, terminal agent execution, and complex reasoning:

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How to Use

Serving via vLLM

vllm serve pragmaticcs/Triumvirate \
  --dtype bfloat16 \
  --max-model-len 65536 \
  --gpu-memory-utilization 0.95 \
  --enable-prefix-caching \
  --enable-auto-tool-choice \
  --tool-call-parser qwen3_coder \
  --enable-reasoning \
  --reasoning-parser qwen3

Inference via Transformers

import torch
from transformers import AutoModelForCausalLM, AutoTokenizer

model_id = "pragmaticcs/Triumvirate"

tokenizer = AutoTokenizer.from_pretrained(model_id)
model = AutoModelForCausalLM.from_pretrained(
    model_id,
    torch_dtype=torch.bfloat16,
    device_map="auto"
)

messages = [
    {
        "role": "system",
        "content": "You are a principal software engineer. Think carefully before outputting production-grade code."
    },
    {
        "role": "user",
        "content": "Implement an asynchronous token-bucket rate limiter in Python supporting burst handling and thread-safe redis synchronization."
    }
]

inputs = tokenizer.apply_chat_template(
    messages,
    add_generation_prompt=True,
    enable_thinking=True,
    return_tensors="pt"
).to(model.device)

outputs = model.generate(
    inputs,
    max_new_tokens=2048,
    temperature=0.6,
    top_p=0.95,
    top_k=20,
    do_sample=True,
)

response = tokenizer.decode(outputs[0][inputs.shape[-1]:], skip_special_tokens=True)
print(response)

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Citation & References

• Qwen/Qwen3.5-9B
• XiaomiMiMo/MiMo-V2.6-Distill-Qwen-9B
• ornith-ai/Ornith-1.5-9B
• Jackrong/Qwopus3.5-9B-Coder
• Improved Chat Template for Qwen 3.x

@inproceedings{yadav2023ties,
  title={Resolving Interference When Merging Models},
  author={Yadav, Prateek and Tam, Derek and Choshen, Leshem and Raffel, Colin and Bansal, Mohit},
  booktitle={Advances in Neural Information Processing Systems (NeurIPS)},
  volume={36},
  pages={7093--7115},
  year={2023}
}

@article{deep2024della,
  title={DELLA-Merging: Reducing Interference in Model Merging through Magnitude-Based Sampling},
  author={Deep, Pala Tej and Bhardwaj, Rishabh and Poria, Soujanya},
  journal={arXiv preprint arXiv:2406.11617},
  year={2024}
}

@inproceedings{yu2024dare,
  title={Language Models are Super Mario: Absorbing Abilities from Homologous Models as a Free Lunch},
  author={Yu, Le and Yu, Bowen and Yu, Haiyang and Huang, Fei and Li, Yongbin},
  booktitle={International Conference on Machine Learning (ICML)},
  year={2024}
}