REVIEW 4 major objections 5 minor 89 references
Compass-V2 Technical Report
T0 review · 4 major / 5 minor · reviewed 2026-08-16 · deepseek-v4-flash
Pith's one-line read A 5B-active-parameter model claims state-of-the-art Southeast Asian language and e-commerce performance among sub-30B models.
desk verdict Real MoE engineering, no artifacts; the SOTA claim is a claim, not a result. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The engine of the design is a fine-grained Mixture-of-Experts (MoE) transformer in which every token routes through 2 shared experts and 4 specialized experts drawn from 48, giving 30B total parameters with only 5B active per token; a load-balancing auxiliary loss and a router Z-loss keep expert usage even during training. Supporting machinery includes a three-way sub-tokenizer merged into a 180k-vocabulary BPE tokenizer with the best reported compression on SEA languages, a three-stage pretraining schedule (8T tokens, 4T high-quality annealing, then extension from 4k to 32k context), and post-training with two SFT stages plus Online-DPO. The hybrid reasoning capability comes from long chain-of-thought data with thinking tags added in the second SFT stage, selectively downsampled to avoid degrading general skills.
What would settle it
Release the in-house evaluation prompts and answers, then run a near-duplicate search against the 12T-token pretraining corpus and the SFT and DPO data; finding substantial overlap would show the reported in-house scores measure memorization rather than capability. Alternatively, a rerun of the open-source benchmarks (Shopping MMLU, ECInstruct, and the general set) under identical generation settings without the custom tokenizer would test whether the advantage survives fair comparison.
Extended reading notes
Core claim
On its own terms, the paper reports that Compass-v2 achieves the highest average scores among comparable sub-30B models on open-source e-commerce benchmarks (55.74% average, beating the runner-up by a relative 10.6%) and on general English benchmarks (72.21% average), while activating only 5B parameters per token. It also reports in-house multilingual scores averaging 76.64, within about two points of GPT-4o and Qwen2.5-72b despite its smaller scale. The model unifies fast and deep reasoning through a single checkpoint: a long chain-of-thought prompt template triggers step-by-step thinking, and the authors report the hybrid training preserves general performance within a 1% drop. These claims rest on internal evaluation sets built from real Shopee scenarios, scored with GPT-4.
Load-bearing premise
The claim of state-of-the-art performance depends on internal evaluation datasets that are not publicly released and have not been checked for overlap with the training data; if those datasets leak into pretraining or fine-tuning, or if the GPT-4 judge is biased, the reported advantage may not be real.
Editorial extensions
If this is right
- A region-focused MoE trained from scratch can match or beat general-purpose dense models several times its active size on low-resource language tasks.
- One checkpoint can serve both lightweight chat and long step-by-step reasoning, removing the operational cost of maintaining two models.
- 4-bit AWQ quantization preserves benchmark accuracy while delivering a 1.58x throughput gain over FP16 at high concurrency, making such models deployable on modest GPU fleets.
- A tokenizer built by merging language-group sub-tokenizers improves compression for SEA languages, directly cutting per-token inference cost.
Reading between the lines
- If the tokenizer compression advantage generalizes, the same sub-tokenizer merging recipe could be applied to other low-resource language families (for example, South Asian or African languages) with similar efficiency gains.
- The reported results suggest that for domain-specific low-resource deployments, investing in cleaned native corpora and a bespoke tokenizer may yield more value than starting from an English-centric checkpoint, though matched compute budgets would be needed to confirm this.
- A direct test of the hybrid reasoning claim would be to measure whether the same checkpoint, with the general template active, matches a dedicated fast model on latency-sensitive e-commerce queries while the LongCoT template matches a dedicated reasoning model on math benchmarks.
- Contamination is the key threat: because the in-house evaluation uses unreleased Shopee-derived prompts, publishing them and scanning the 12T-token corpus for near-duplicates would let the community verify the claim.
Signed reviews
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. This technical report describes Compass-v2, a fine-grained Mixture-of-Experts (MoE) language model with 30B total and 5B active parameters, designed for Southeast Asian (SEA) languages and e-commerce applications. The authors present a three-stage pretraining pipeline on 12T tokens (generic pretraining, high-quality annealing, and long-context extension), a two-stage SFT on about 6M instructions, and an online-DPO alignment stage. They also introduce a hybrid reasoning design that supports both fast-thinking and deep-thinking responses within one model. Evaluation is reported on open multilingual, e-commerce, and general English benchmarks, and on in-house Shopee datasets scored by GPT-4. The abstract claims state-of-the-art SEA multilingual and e-commerce performance among sub-30B models with significantly lower inference cost.
Significance. If the reported results are accurate, Compass-v2 is a practically relevant contribution: a compact MoE trained from scratch for SEA languages and e-commerce, with a tokenizer that achieves strong compression on SEA languages (Figure 6) and a hybrid reasoning mode that reportedly preserves general performance within 1% (Section 5.3). The open-benchmark tables (Tables 6-8) provide some external grounding and show a broadly competitive model, and the data-quality comparison (Table 1) is a useful reference point. However, the absence of a public model, data, or evaluation harness, together with the reliance on a private GPT-4-scored evaluation for the strongest claims, limits the immediate impact of the work until those artifacts are released.
major comments (4)
- [Abstract, §1, §7.4, Table 8] The abstract and Section 1 claim 'state-of-the-art SEA multilingual and e-commerce performance among sub-30B models.' This is not fully supported by the paper's own open-benchmark tables. In Table 8, Compass-v2 scores 0.7801 on MMLU, below Qwen2.5-14b's 0.7991; 0.4091 on GPQA, below Qwen2.5-14b's 0.4394; 0.5913 on ARC, below Qwen2.5-14b's 0.6220; and 0.8150 on GSM8K, below Qwen2.5-7b's 0.8347. Since Qwen2.5-14b and Qwen2.5-7b are both sub-30B models, the claim either needs a clearly defined aggregation rule under which Compass-v2 is indeed the best, or a more modest phrasing such as 'competitive with' or 'among the best.'
- [§7.5, Table 9] The in-house evaluation is load-bearing for the claims of state-of-the-art SEA multilingual and e-commerce performance and for the statement that Compass-v2 is 'comparable' to GPT-4o and Qwen2.5-72b. However, this evaluation is not externally verifiable: the prompts are not released, no contamination analysis is performed against the SFT and DPO data described in Sections 3 and 4, and the judge is GPT-4, which is also one of the baselines in Table 9. Moreover, no error bars or statistical tests are reported for any of the tables. To support the central claims, the authors should release the evaluation prompts (or a substantial sample), provide a contamination check, describe the judge protocol in detail, and report variance across repeated evaluations.
- [Abstract, §5.1] The abstract claims that the authors 'pioneered a hybrid reasoning model that supports both fast thinking and deep thinking within a unified framework.' However, Section 5.1 explicitly cites Anthropic (2025) as a prior hybrid reasoning model of this kind. The word 'pioneered' is therefore inaccurate and should be replaced with a more measured term such as 'introduced' or 'presented.' The novelty of the hybrid reasoning design relative to Anthropic (2025) should also be stated explicitly.
- [§2.1.2, Table 1] The claim that the Compass-v2 (EN) dataset 'surpasses the best open-source datasets in the industry' rests on a single evaluation run with no reported variance. The difference between Compass-v2 (EN) (0.6397) and Combined (EN) (0.6366) is only 0.0031 in average score, which is within typical run-to-run noise for a 210B-token pretraining comparison. The paper should report multiple seeds, confidence intervals, or a significance test before making this strong claim.
minor comments (5)
- [Throughout] There are several typos: 'Comapss-v2' (Section 1), 'Quantizaiton' (Section 1), 'Qwem2.5-72b' (Section 1), 'wtih' (Section 7.4), 'pionneering' (Section 8.1), 'instend' (Section 4.1), and 'reuslt' (Section 3.1.1). Please copyedit the manuscript.
- [§2.2] The auxiliary loss formula for load balancing is typeset as Laux = N · Σ_i (p_i/B · c_i/B · K), which is dimensionally unclear. Please provide the correct mathematical expression or explicitly define p_i, c_i, B, and K so that the formula is unambiguous.
- [§2.3.3] The acronym 'ABF' is used without expansion. Please define it on first use (e.g., 'adjusted base frequency,' citing Xiong et al., 2023).
- [§7.1] The evaluation settings for baselines are incomplete; for example, Sailor2 and Moonlight are given as 'huggingface opensource generation config.' For reproducibility, consistent generation parameters should be listed for all baselines.
- [§10] The disclaimer in Section 10 is a legal boilerplate and is not a substitute for a scientific limitations statement. Please add a short limitations paragraph addressing the internal-evaluation constraints and the absence of public artifacts.
Circularity Check
No significant circularity: the central performance claims rest on external open benchmarks and controlled comparisons, not on inputs by construction.
full rationale
The paper's central claims (SEA multilingual and e-commerce performance among sub-30B models at 5B active parameters) are supported primarily by Tables 6-8, which use external open benchmarks such as XCOPA, MMLU, HellaSwag, Shopping MMLU, ECInstruct, GSM8K, GPQA, and Belebele, with fixed generation settings. These are independent, externally grounded measurements rather than quantities derived from the model's own training objective. Table 1's dataset-quality comparison is a controlled experiment: 210B-token samples from each corpus are used to train a 7B model under identical settings, so the comparison is not a fit renamed as a prediction. The in-house Table 9 evaluation is self-reported and lacks released prompts, contamination analysis, and error bars, but that is a verification limitation, not a circular reduction: the model is trained and then measured on same-domain Shopee tasks, which is normal empirical evaluation rather than an equation forcing the outcome. Self-citations to the prior Compass report (Maria 2024) describe the predecessor pipeline and dataset scale, but none of the load-bearing performance claims reduces to those citations; the current data-quality comparison is independently executed. The hybrid-reasoning claim is an architectural and data choice, not a result derived from its own premises. No equation in the paper equates a predicted quantity to a fitted input, and no uniqueness or ansatz is imported by self-citation. Accordingly, no specific circular step can be exhibited, and the appropriate finding is no significant circularity.
Assumptions & free parameters
free parameters (4)
- Pretraining data mixture proportions
- Auxiliary loss coefficient α and Z-loss coefficient β =
max 0.01 and 0.001, decaying
- Long-CoT data downsampling ratio =
tuned to keep general metrics within a 1% drop
- Reasoning-data pass-rate thresholds [α, β]
assumptions (4)
- domain assumption The 12T-token corpus was curated as described (language identification, deduplication, filtering, resampling).
- domain assumption GPT-4-as-judge scoring of in-house free-form answers is a valid and unbiased proxy for quality.
- domain assumption Baselines are evaluated under fair, near-optimal settings (e.g., hyperparameters in Section 7.1).
- domain assumption The open SEA benchmarks (XCOPA, MMLU, HellaSwag, OpenBookQA) measure meaningful multilingual capability in SEA languages.
Cite this review
Pith. "Pith review of Compass-V2 Technical Report." pith.science (2026). https://pith.science/paper/JM5JH5FN
@misc{pith2026250415527,
author = {Pith},
title = {Pith review of: Compass-V2 Technical Report},
year = {2026},
howpublished = {\url{https://pith.science/paper/JM5JH5FN}},
note = {Machine review of arXiv:2504.15527}
}
read the original abstract
Predominant LLMs focus on high-resource languages while leaving low-resource languages, particularly those in Southeast Asia (SEA), underrepresented. In addition, those models are general-purpose and pay limited attention to the e-commerce domain. To overcome these limitations, we introduce Compass-v2, a lightweight Mixture-of-Experts (MoE) model specifically designed for Southeast Asian languages and e-commerce applications. To balance model performance and inference cost, the model is designed with 30B total parameters and 5B active parameters, incorporating both fine-grained and shared expert modules. To enhance multilingual performance, we curated and constructed a high-quality, industry-leading SEA dataset, to the best of our knowledge. To boost performance in the e-commerce domain, we built a dataset comprising hundreds of billions of tokens, sourced through external data mining and internal platform collection. Besides, we pioneered a hybrid reasoning model that supports both fast thinking and deep thinking within a unified framework to enhance the reasoning capabilities, diverging from the conventional industry practice of deploying two separate models. Through extensive experimental evaluations, our model demonstrates state-of-the-art SEA multilingual and e-commerce performance among sub-30B models, while maintaining significantly lower inference cost.
Figures
Figures from the paper (11 more)
Reference graph
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@esa (Ref
\@ifxundefined[1] #1\@undefined \@firstoftwo \@secondoftwo \@ifnum[1] #1 \@firstoftwo \@secondoftwo \@ifx[1] #1 \@firstoftwo \@secondoftwo [2] @ #1 \@temptokena #2 #1 @ \@temptokena \@ifclassloaded agu2001 natbib The agu2001 class already includes natbib coding, so you should ...
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[86]
\@lbibitem[] @bibitem@first@sw\@secondoftwo \@lbibitem[#1]#2 \@extra@b@citeb \@ifundefined br@#2\@extra@b@citeb \@namedef br@#2 \@nameuse br@#2\@extra@b@citeb \@ifundefined b@#2\@extra@b@citeb @num @parse #2 @tmp #1 NAT@b@open@#2 NAT@b@shut@#2 \@ifnum @merge>\@ne @bibitem@firs...
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[87]
Please summarize the following passage in Chinese, using a formal tone, no more than 50 words, and ensuring that the keyword ‘artificial intelligence’ is included
@open @close @open @close and [1] URL: #1 \@ifundefined chapter * \@mkboth \@ifxundefined @sectionbib * \@mkboth * \@mkboth\@gobbletwo \@ifclassloaded amsart * \@ifclassloaded amsbook * \@ifxundefined @heading @heading NAT@ctr thebibliography [1] @ \@biblabel @NAT@ctr \@bibset...
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[88]
, " * write output.state after.block = add.period write
ENTRY address author booktitle chapter doi edition editor eid howpublished institution journal key month note number organization pages publisher school series title type url volume year label INTEGERS output.state before.all mid.sentence after.sentence after.block FUNCTION in...
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[89]
write newline
" write newline "" before.all 'output.state := FUNCTION n.dashify 't := "" t empty not t #1 #1 substring "-" = t #1 #2 substring "--" = not "--" * t #2 global.max substring 't := t #1 #1 substring "-" = "-" * t #2 global.max substring 't := while if t #1 #1 substring * t #2 gl...
Reviewed August 16, 2026 · model on record in the stance chip above.
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