REVIEW 4 major objections 5 minor 7 cited by
Large Action Models: From Inception to Implementation
T0 review · 4 major / 5 minor · reviewed 2026-08-11 · deepseek-v4-flash
Pith's one-line read A four-phase training pipeline converts a 7B language model into a Large Action Model that the paper reports surpasses GPT-4o on Windows GUI task completion, reaching 81.2% offline task success versus 67.2% for GPT-4o, and 71.0% online…
desk verdict A genuinely useful engineering recipe for turning a 7B model into a Windows GUI agent, but the headline performance claim rests on an unverified test-set split and a circular GPT-4o-as-teacher-and-judge setup. 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 central object is the four-phase LAM training pipeline. Phase 1, task-plan pretraining, uses supervised fine-tuning on task-plan pairs drawn from documentation, WikiHow, search queries, and evolved data to teach the model to decompose requests into structured plans. Phase 2, learning from experts, fine-tunes on GPT-4o-generated action trajectories where each step maps a UI state to a concrete action, grounding the plans in an executable form. Phase 3, self-boosting exploration, uses the ReAct mechanism to let the model attempt tasks that GPT-4o failed, collecting its own successful trajectories as new training data. Phase 4, learning from a reward model, trains a scalar reward model with uniform +1/−1 labels on successful and failed trajectories and uses offline PPO to optimize the policy on failure trajectories. This staged progression—from planning, to imitation, to self-exploration, to reward-based refinement—is what carries the argument, along with the automated data-collection pipeline that converts abstract task-plan data into concrete, execution-validated action sequences.
What would settle it
Re-run the offline and online evaluation on a disjoint, human-annotated set of Windows GUI tasks never touched by any training phase, scoring success by document-state verification such as XML diff rather than GPT-4o judgment; if the reported gap over text-only GPT-4o disappears or inverts, the paper's core claim is refuted.
Extended reading notes
Core claim
The paper's central claim is that its four-phase training recipe yields a specialized action model whose performance exceeds the teacher model, GPT-4o, that supplied most of its training data, in both offline and online evaluation. The phase-wise trajectory is concrete: LAM1, trained only on 76,672 task-plan pairs, reaches 82.2% planning task success; LAM2, which imitates 2,192 GPT-4o-generated action trajectories, jumps to 76.8% decision-making task success; LAM3, which adds 496 self-generated successes from tasks GPT-4o failed, reaches 79.3%; and LAM4, refined with a reward model and offline PPO on 1,788 failure trajectories, reaches 81.2%. Online, LAM's text-only task success rate of 71.0% surpasses GPT-4o's text-only 63.0%, while GPT-4o with visual input reaches 75.5% but takes 96.48 seconds versus LAM's 30.42 seconds. The paper presents this as evidence that a domain-specialized LAM trained from scratch can be both more accurate and far more efficient than a state-of-the-art generalist model, and that the workflow transfers beyond the Windows/Word case study.
Load-bearing premise
The evaluation treats the same 435 test requests used during training as the online test set and relies on GPT-4o to judge whether tasks succeeded, so the claim that LAM4 beats GPT-4o depends on those test tasks not leaking into the self-boosting and reward-model training data and on the judge being unbiased.
Editorial extensions
If this is right
- A 7-billion-parameter specialized model can outperform a much larger generalist LLM on bounded GUI tasks, both in task success rate and in execution speed, when trained with environment-grounded data.
- The jump from 76.8% to 79.3% offline task success shows that a model can learn from its own successes on tasks its teacher failed, making self-boosting a viable data source beyond expert demonstrations.
- Adding reward-model-guided offline RL on failure trajectories yields a further improvement to 81.2%, indicating that mistakes, when properly scored, are useful training signal rather than noise to discard.
- The authors claim the same data-collection and training workflow carries over to other environments and applications, offering a template for building LAMs beyond the Windows and Word testbed.
Reading between the lines
- A testable consequence of the pipeline's reliance on environment-specific action grounding is that performance will likely drop more sharply on Windows applications not seen in training (e.g., Excel or PowerPoint) than on unseen Word tasks; the paper reports no cross-application generalization results.
- Because the 435 online test tasks are the same set used for training, the reported online TSR of 71.0% is best read as an upper bound; a held-out task set scored by human verification or document-state checks would give a cleaner, likely smaller, estimate of the pipeline's true benefit.
- The reward model assigns the same +1 to every step of a successful trajectory and −1 to every step of a failed one, ignoring intermediate progress; a step-level or progress-aware reward could plausibly extract more from the failure trajectories than the reported 1.9-point gain.
- The efficiency edge of a text-only, 7B-parameter LAM suggests the approach could extend to resource-constrained or edge deployment, but the pipeline's dependence on GPT-4o for data annotation and evaluation leaves open how it would bootstrap in a domain without a strong teacher model.
Signed reviews
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper presents a four-phase pipeline for converting Mistral-7B into a Windows GUI agent (LAM4), consisting of task-plan pretraining, supervised fine-tuning on GPT-4o trajectories, self-boosting exploration on GPT-4o failure cases, and offline PPO with a learned reward model. Using Microsoft Word as a testbed and the UFO agent for grounding, the authors report offline TSR of 81.2% versus 67.2% for GPT-4o (Table 3) and online TSR of 71.0% versus 63.0% for text-only GPT-4o (Table 4), with substantially lower latency. The paper also positions the workflow as a generalizable blueprint for LAM development and releases the data collection code.
Significance. The staged data collection and training recipe, detailed prompts, and public dataflow code are useful engineering contributions, and the paper is clearly organized. The headline result—a 7B text-only model beating GPT-4o on Windows GUI task completion with roughly 2–3x lower latency—would be practically significant if the evaluation is valid. However, the current evidence does not establish that result, because the test split may have been used in Phases 3 and 4 and because GPT-4o serves as data generator, filter, and judge throughout. The manuscript's strengths are its explicit phasewise data counts, the concrete description of grounding in the UFO agent, and the reproducibility of the data collection pipeline.
major comments (4)
- [§4.2, §4.3, §4.4, §7.1] The test set appears to contaminate Phases 3 and 4. Section 4.2 splits the 2,192 GPT-4o successes into 1,757 training and 435 test trajectories, but Section 4.3 states that LAM3 is fine-tuned on the original 2,192 GPT-4o successes plus 496 new successes, and Section 4.4.1 trains the reward model on GPT-4o's successful trajectories (2,192) as well as 1,788 LAM failures. Section 7.1 then says online evaluation uses the same set of 435 test requests used during LAM training. Unless the authors provide a task-level audit showing that the 435 test task IDs were excluded from the Phase 3 training pool, the Phase 3 failure pool, and the Phase 4 RM/PPO pools, Tables 3 and 4 can be explained by memorization rather than generalization. This is the most load-bearing issue and must be fixed by re-running Phases 3 and 4 with an explicit held-out split and reporting the resulting numbers.
- [§3.1.3, §3.2.1, §3.2.3, §5.2.1, §7.4] GPT-4o is used both to generate the data the model is trained on and to judge whether tasks are successfully completed. Specifically, GPT-4o constructs task-plan data (Section 3.1.3), instantiates task-action trajectories (Section 3.2.1), filters which execution trajectories are retained (Section 3.2.3), computes the planning metrics for LAM1 (Section 5.2.1), and determines online task success (Section 7.4). Because LAM is trained to imitate GPT-4o's style and then evaluated by a GPT-4o judge, the judge may systematically favor LAM's outputs over GPT-4o's own zero-shot outputs. The authors should validate at least a sample of the online evaluations with human judgment or with an independent deterministic success criterion (e.g., final document state), and report agreement or disagreement with the GPT-4o judge.
- [§5.3, §7.4 (Tables 3 and 4)] All headline comparisons are single point estimates over 435 tasks with no confidence intervals, significance tests, or multiple runs. Given the relatively small test set and the additional variance in online execution, the claim that LAM4 'outperforms' GPT-4o requires more than point estimates; please report bootstrap confidence intervals or per-task breakdowns for the TSR differences in Tables 3 and 4.
- [§5.3.1] The offline decision-making metrics compare predicted actions against a ground-truth action history that was itself generated by GPT-4o. This exact-match style of evaluation penalizes valid alternative solutions and therefore favors models fine-tuned on that exact distribution. The offline TSR should be interpreted as a measure of imitation fidelity rather than task-completion quality, and this distinction should be stated explicitly in the paper.
minor comments (5)
- [Figure 4 caption] The caption says 'two-phrase data collection'; this should be 'two-phase data collection.'
- [§3.1.4] The data augmentation numbers are not fully consistent: 29,182 original pairs plus 47,490 evolved pairs gives 76,672, but 'increased by 150%' suggests 43,773 additional pairs; please clarify the exact augmentation ratio and how the 47,490 figure is derived.
- [§4.4] The sentence beginning 'we first The reward model' is incomplete and should be rewritten.
- [Appendix B.2 heading] The heading says 'The instantiation prompt used in the evaluation phase,' but the prompt is the evaluation prompt, not the instantiation prompt; please correct the heading.
- [§5.2.2 and Table 2] The evaluation in Table 2 is reported on 15,334 tasks, which is not reconciled with the 76,672 training pairs described in Section 3.1.4; please state the split and whether any evolution-derived tasks appear in the evaluation set.
Circularity Check
Reported test set was included in Phases 3-4 training, so the TSR advantage over GPT-4o is a fit, not a prediction.
-
fitted input called prediction
[Sections 4.2-4.4 and 7.1 (test split reused in later training; online test on the same requests)]
"We split these 2,192 trajectories into a training set of 1,757 and a test set of 435 trajectories... These self-labeled successes, combined with the original 2,192 GPT-4o successes, form an augmented dataset... we train a reward model (RM) on ... GPT-4o’s successful trajectories (2192) gathered in previous phases... The online performance of LAM is evaluated on the same set of 435 test requests used during LAM training."
The 435 'test' trajectories are a subset of the 2,192 GPT-4o successes defined in Section 4.2. Phase 3 fine-tuning of LAM3 uses all 2,192 GPT-4o successes, and Phase 4 reward-model training uses the same 2,192 plus LAM trajectories, without excluding the 435 test IDs. Consequently the offline TSR of 81.2% (Table 3) and the online TSR of 71.0% (Table 4) are computed on tasks whose trajectories were training inputs for LAM3 and LAM4. The 'prediction' reduces by construction to a re-measurement on fitted data: the model was optimized on the test tasks, so the reported margin over GPT-4o is not an out-of-sample generalization result.
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self definitional
[Sections 3.2.3, 5.2.1, and 7.4 (GPT-4o as labeler, filter, and judge)]
"we prompt GPT-4o to evaluate whether the executed task aligns with the original task description and achieves successful completion... To compute these metrics, we leverage GPT-4o to compare each step of the LAM1 output with the corresponding ground truth steps... Task success is determined by an evaluation agent using GPT-4o, which assesses the full task completion trajectory, including plans, action sequences, and screenshots, to verify task completion."
GPT-4o constructs the task-plan and task-action data (Sections 3.1.3 and 3.2), decides which trajectories are retained as 'successful' during data collection (Section 3.2.3), scores planning metrics (Section 5.2.1), and finally judges online task completion (Section 7.4). The model is therefore trained to satisfy a GPT-4o-generated notion of success and then evaluated by the same model family using that same notion. This makes the headline comparison 'LAM surpasses GPT-4o' a measurement against a criterion manufactured by GPT-4o itself, rather than an independent ground truth; the evaluation loop is closed by the same system that produced the training labels.
full rationale
The decisive circularity is in the evaluation protocol, not in the training equations. Section 4.2 splits the 2,192 GPT-4o trajectories into 1,757 training and 435 test trajectories, but Sections 4.3-4.4 then use 'the original 2,192 GPT-4o successes' to fine-tune LAM3 and to train the Phase 4 reward model, with no exclusion of the 435 test IDs. Since the 435 test trajectories are a subset of those 2,192, the offline TSR of 81.2% (Table 3) and the online TSR of 71.0% (Table 4) are measured on trajectories that were training inputs for LAM3/LAM4. The reported 'prediction' is therefore a fitted-input evaluation: the model was optimized on the test tasks, so its superiority over GPT-4o is not an out-of-sample result. A secondary self-referential loop compounds this: GPT-4o generates the task-plan and task-action labels, filters trajectories as successful in Section 3.2.3, computes plan metrics in Section 5.2.1, and judges online task completion in Section 7.4, so the success criterion is defined by the same model family that produced the training targets. I do not find load-bearing self-citation or imported uniqueness; the four-phase training pipeline itself is not circular. The score of 7 reflects that the central empirical claim reduces, at the evaluation stage, to a fit on the reported test set rather than an independent generalization result.
Assumptions & free parameters
free parameters (3)
- Uniform binary reward assignment =
+1 for each step in successful trajectories, -1 for each step in failed trajectories
- Data evolution augmentation ratio =
150% increase, yielding 47,490 evolved samples
- Phase 3 exploration sample size =
2,284 GPT-4o failed tasks sampled, 496 successes kept
assumptions (5)
- domain assumption GPT-4o-generated trajectories are valid expert demonstrations.
- domain assumption GPT-4o evaluation of task completion is a reliable ground truth.
- domain assumption The 435 test tasks were not used in Phases 3-4 training.
- domain assumption UIA API provides complete and accurate control metadata for grounding actions.
- domain assumption Task success can be inferred from screenshots, XML canvas states, and control states.
Cite this review
Pith. "Pith review of Large Action Models: From Inception to Implementation." pith.science (2026). https://pith.science/paper/LMEYHKIK
@misc{pith2026241210047,
author = {Pith},
title = {Pith review of: Large Action Models: From Inception to Implementation},
year = {2026},
howpublished = {\url{https://pith.science/paper/LMEYHKIK}},
note = {Machine review of arXiv:2412.10047}
}
read the original abstract
As AI continues to advance, there is a growing demand for systems that go beyond language-based assistance and move toward intelligent agents capable of performing real-world actions. This evolution requires the transition from traditional Large Language Models (LLMs), which excel at generating textual responses, to Large Action Models (LAMs), designed for action generation and execution within dynamic environments. Enabled by agent systems, LAMs hold the potential to transform AI from passive language understanding to active task completion, marking a significant milestone in the progression toward artificial general intelligence. In this paper, we present a comprehensive framework for developing LAMs, offering a systematic approach to their creation, from inception to deployment. We begin with an overview of LAMs, highlighting their unique characteristics and delineating their differences from LLMs. Using a Windows OS-based agent as a case study, we provide a detailed, step-by-step guide on the key stages of LAM development, including data collection, model training, environment integration, grounding, and evaluation. This generalizable workflow can serve as a blueprint for creating functional LAMs in various application domains. We conclude by identifying the current limitations of LAMs and discussing directions for future research and industrial deployment, emphasizing the challenges and opportunities that lie ahead in realizing the full potential of LAMs in real-world applications. The code for the data collection process utilized in this paper is publicly available at: https://github.com/microsoft/UFO/tree/main/dataflow, and comprehensive documentation can be found at https://microsoft.github.io/UFO/dataflow/overview/.
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A doc with a rectangle shape
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The < New Task > must based on the given task
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[99]
The < New Task > must be able to be completed step - by - step by a Windows Operating System or an Application on Windows platform . 19
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[100]
You should try your best not to make the < New Task > become verbose , < New Task > can only add up to 50 words into # Given Task #
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[101]
The detailed target in < New Task > should be specific and clear based on the doc canvas content and control information
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[102]
# # The requirements for < Action Plan >
The < New Task > should be able to implemented by the available controls and actions . # # The requirements for < Action Plan >
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[103]
The < Action Plan > should be step - by - step actions to take in the doc file environment
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[104]
Each action should be in the available actions from < Available Actions >
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[105]
observation
Each action should be generated with a " step " description which is the function description of the action . # # Response Format - You are required to response in a JSON format , consisting of several distinct parts with the following keys and corresponding content : {{ " obs...
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[106]
yes " ,
You should also give a overall evaluation of whether the task has been finished , marked as " yes " ," no " or " unsure "
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[107]
ambiguous
You should also give a overall evaluation of the quality of task , marked as " ambiguous " ," over - detailed " or " good " . Criteria for evaluation of the task completion :
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[108]
If the controls or canvas content expected to be changed are not changed , the task is not completed
The < Final Control State : > and < Final Env Status : > should be consistent with the task requirements . If the controls or canvas content expected to be changed are not changed , the task is not completed
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[109]
If the agent actions are not consistent with the task requirements , the task is not completed
The < Execution Trajectory > should be consistent with the task requirements . If the agent actions are not consistent with the task requirements , the task is not completed
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[110]
Criteria for evaluation of the task quality :
If any action in the < Execution Trajectory > is empty , the task is not completed . Criteria for evaluation of the task quality :
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[111]
selection
The description of the < Original Request : > should be clear and unambiguous , without the meaning of " selection "
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[112]
task_quality
The description of the < Original Request : > should not be too detailed like step - by - step actions . # # Response Format You must strictly follow the below JSON format for your reply , and do not change the format nor output additional information . {{ " task_quality " : T...
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[113]
Yes " or
Can < Answer1 > solve the user s question ? - Your answer should be " Yes " or " No "
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[114]
Yes " or
Can < Answer2 > solve the user s question ? - Your answer should be " Yes " or " No "
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[115]
similar action item from action item set1 / similar action item from action item set2
Both two answers contain a list of steps marked by numbers . Your task is to extract action items from the provided steps in both answers . The action item is defined like a combination of action and element . Compare the action items to identify similarities . Output the simi...
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[116]
1" or "2
Which assistant provides a more helpful response ? - Your answer should be "1" or "2" , where "1" represents < Answer1 > and "2" represents < Answer2 >. - Your answer should contain the reason ( s ) for your choice . You should not focus on the length of the answer or the deta...
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Reviewed August 11, 2026 · model on record in the stance chip above.
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