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REVIEW 3 major objections 5 minor 1 cited by

PLANET: A Collection of Benchmarks for Evaluating LLMs' Planning Capabilities

T0 review · 3 major / 5 minor · reviewed 2026-08-16 · deepseek-v4-flash

Pith's one-line read The paper organizes LLM planning benchmarks into seven categories and identifies four gaps in how planning is tested.

desk verdict A useful benchmark map for newcomers, but the corrupted Section 5 and missing promised recommendations make this survey unpublishable as is. read the letter →

arxiv 2504.14773 v1 pith:N64CVEHQ submitted 2025-04-21 cs.AI cs.CLcs.LGcs.MA

classification cs.AIcs.CLcs.LGcs.MA
keywords planningbenchmarksLLMagentsagenticAIbenchmarksurveyworldmodelslong-horizontasksunderuncertaintymultimodal
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper tries to bring order to the growing menagerie of benchmarks for evaluating whether large language models can plan. It organizes recent benchmarks into seven categories, from embodied household environments to web navigation, scheduling, games and puzzles, everyday task automation, text-based reasoning, and planning as a subtask of general agentic benchmarks. On this basis it identifies four gaps: static world models, fragile long-horizon planning, little planning under uncertainty, and scant multimodal support. The intended payoff is a map that helps researchers choose the right testbed for a planning algorithm and shows where new benchmarks are needed.

What carries the argument

The organizing device is the paper's working definition of planning: explicit state modeling, outcome reasoning, goal orientation, and constructing sequences or policies under constraints, formalized through a Markov decision process with states $S$, actions $A$, transition model $p_\theta(s_{t+1}\mid s_t, a_t)$, reward $r_\theta$, and policy $a_t = p_\phi(a\mid s_t)$. This definition is the filter that selects benchmarks for the seven categories and the lens through which the four gaps are derived; those gaps are static world models, long-horizon fragility, lack of uncertainty, and limited multimodality.

What would settle it

A systematic enumeration of planning-related benchmark papers from the same period that finds a substantial cluster fitting none of the seven categories, for example benchmarks built around formal PDDL planning domains with dynamic, stochastic elements, or a pre-existing multimodal benchmark with dynamic world models that the survey omits, would show the taxonomy and the four-gap analysis to be incomplete.

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Extended reading notes

Core claim

The paper claims that the field lacks a comprehensive understanding of planning benchmarks, and that a principled way to define planning, as tasks with explicit state modeling, outcome reasoning, goal orientation, and sequences or policies within constraints, yields a seven-way taxonomy of available testbeds. Surveying those testbeds, it argues that common benchmarks make planning too easy by relying on static, fully observable worlds, so LLMs can succeed by pattern matching rather than building and revising world models; that long-horizon plans are fragile because agents lack state tracking and error recovery; that uncertainty and partial information are under-tested; and that text-only evaluation bypasses the visual grounding needed for multimodal agents. The paper's recommendation is that future benchmark development should target dynamic environments, long horizons, uncertainty, and multimodality.

Load-bearing premise

The survey's utility rests on its hand-picked selection of benchmarks being representative enough to ground its recommendations, but it states no inclusion criteria and performs no systematic search, so an unrepresentative selection would weaken the category map and the gap analysis.

Editorial extensions

If this is right

  • Researchers choosing a testbed can use the seven-category map to match a benchmark to the planning capability they want to isolate, such as constraint satisfaction in scheduling or long-horizon execution in web navigation.
  • If the four gaps are real, new benchmarks that stress dynamic world models, long horizons, uncertainty, and multimodality would better expose whether LLMs plan or pattern-match.
  • Text-only benchmarks may overstate LLM planning ability relative to multimodal settings, since visual grounding is largely bypassed in current suites.
  • The MDP-based definition implies that benchmarks evaluating planning should report state transitions and goal conditions explicitly, so that plan validity can be checked mechanically.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • The four gaps suggest a concrete re-ranking test: adding a stochastic or partially observable variant of an existing benchmark, say TravelPlanner with flight delays, would likely separate planners that rebuild state estimates from those that rely on static context.
  • Because planning spans games, web use, and scheduling, a single benchmark can exercise several capabilities at once; future design could treat planning as a compositional dimension rather than a task family.
  • If static world models inflate apparent planning ability, then model rankings from existing leaderboards are probably environment-specific, and transferring them to partially observable deployments would be unreliable.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 5 minor

Summary. The paper is a survey of benchmarks for evaluating LLMs' planning capabilities. It claims to organize existing benchmarks into several categories, identify commonly used testbeds, and recommend appropriate benchmarks for different algorithms. The body describes a number of well-known benchmarks across embodied environments, web navigation, scheduling, games and puzzles, task automation, text-based reasoning, and agentic benchmarks, and it lists four gaps in current benchmark design: simple world models, fragile long-horizon planning, lack of uncertainty handling, and limited multimodal support. The abstract also advertises that the paper 'recommends the most appropriate benchmarks for various algorithms.' As submitted, however, the manuscript contains a corrupted foreign passage in Section 5 with 'xxxxxx' placeholders and unrelated DualFormer material, the abstract promises a five-category scheme while the introduction lists seven, and no section actually delivers the promised benchmark-to-algorithm recommendations. The survey also lacks any stated inclusion criteria or search protocol, so the selection of benchmarks is not verifiable.

Significance. If the paper were cleaned and properly scoped, it could serve as a useful entry point for researchers seeking an overview of popular LLM planning benchmarks. The descriptions of individual benchmarks are, for the most part, accurate and give helpful pointers to the primary sources. The gap discussion in Section 9 also identifies plausible directions for future work. However, the central claims of 'comprehensive understanding' and of recommending benchmarks for various algorithms are not supported as written. The corrupted Section 5 makes one of the seven announced categories unreadable, the absence of a methodology makes the coverage claims non-transparent, and the promised recommendations are absent. These are load-bearing issues for a survey whose stated purpose is to help readers select benchmarks. Because the problems are addressable in revision, I do not treat them as irreparable, but they are substantial.

major comments (3)
  1. [Section 5 (Planning in Games and Puzzles)] Section 5 is not a coherent overview: after the descriptions of SmartPlay, AucArena, GAMA-Bench, Plancraft, and PPNL, the text is interrupted by a foreign passage titled '3 RANDOMIZED STRATEGIC TRACE PRUNING' and '4 EXPERIMENTS' that discusses DualFormer, includes Figures 3.1 and 3.2, a line reading 'stochastic masking Mark's paper U2D2', and a long block of 'xxxxxx' placeholders. A reader cannot determine which game-and-puzzle benchmarks the survey actually covers, and the section does not provide the announced overview of this category. This directly undermines the paper's claim of a comprehensive, seven-category survey.
  2. [Abstract and Sections 1 and 10] The abstract states that the paper 'recommends the most appropriate benchmarks for various algorithms' and that benchmarks are categorized into five groups (embodied environments, web navigation, scheduling, games and puzzles, and everyday task automation), but Section 1 lists seven categories, adding text-based reasoning and planning as a subtask in agentic benchmarks. More importantly, no section of the paper delivers the promised mapping from algorithms or agent capabilities to recommended benchmarks; Section 10 only restates the survey's aim. The authors should either add the missing recommendation mapping or revise the abstract to reflect what the paper actually provides, and they must resolve the five-versus-seven category inconsistency.
  3. [Sections 1 and 10 (methodology)] The survey gives no inclusion criteria, no search protocol, no time window, and no completeness check for its benchmark selection. The four gaps identified in Section 9 (static world models, long-horizon fragility, lack of uncertainty, limited multimodality) are therefore derived from an invisible sample rather than a transparent corpus. Since the paper advertises a 'comprehensive understanding' of planning benchmarks, the absence of a stated methodology is load-bearing: without it, the selection is an unverifiable convenience sample and the gap analysis cannot be reproduced or trusted.
minor comments (5)
  1. [Section 2 (header)] The heading 'Planning in Embodied Environments' is followed by an orphaned line 'TextWorld Embodied' that appears to be a leftover artifact from a figure or sidebar; it should be removed or integrated.
  2. [Section 1 (formal definition)] In the MDP description, 'a reward functionS×A→ R' lacks spacing, and the sentence 'The ultimate goal of an MDP is to develop a policy, denoted as at = pϕ(a|st), focuses on identifying the optimal action...' is grammatically awkward. Please rewrite this passage.
  3. [Section 3 (OSWorld)] The sentence 'with a max step limit of 15 steps' is redundant; 'max' and 'limit' convey the same constraint. Please simplify to 'with a maximum of 15 steps' or similar.
  4. [Section 2 (cross-reference)] The text says 'An illustration of this can be seen in Figure 5' when referring to Blocksworld, but Figure 5 appears much later and is primarily about RAP; the cross-reference should be fixed or the figure should be placed with the Blocksworld discussion.
  5. [Section 5 (figure numbering)] The corrupted passage contains 'Figure 3.1' and 'Figure 3.2' labels, which do not match the paper's figure numbering. If the passage is removed, these labels will disappear; if retained, they must be renumbered and integrated.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity: this is a survey with no fitted parameters or derived predictions; the only self-citations are non-load-bearing pointers.

full rationale

PLANET is a survey and benchmark collection, not a derivation. It contains no fitted parameters, no predictive equations, and no result that is constructed from its own inputs. The abstract promises benchmark-to-algorithm recommendations, but the body never delivers that mapping; Section 5 also contains an unrelated DualFormer passage with placeholders. Those are coherence and correctness problems, not circularity. The only self-references are Li et al. 2024 (LASP) and Wei et al. 2025 (PlanGenLLMs), cited in Section 1 as pointers 'for detailed reviews of algorithms and evaluation metrics.' They are not load-bearing: the survey's seven-category taxonomy is explicitly presented as the authors' organizing view ('In our view, tasks qualify as "planning" if they align with these core properties'), not as a result derived from those self-citations. No equation is reused as an output, no benchmark is predicted from a fitted subset, and no uniqueness theorem is imported from the authors' prior work. Accordingly, the circularity burden is effectively zero.

Assumptions & free parameters 0 free parameters · 2 assumptions · 0 invented entities

This is a survey, so there are no fitted parameters or invented entities. The main axioms are the MDP-based definition of planning and the seven-way categorization, both asserted without systematic justification. The paper's selection of benchmarks is also an unstated assumption that the set is representative.

assumptions (2)
  • domain assumption Planning tasks can be modeled as Markov Decision Processes with explicit state modeling, outcome reasoning, goal orientation, and constraints.
    This framing is introduced in Section 1 and used to justify which benchmarks are categorized as planning. It is an asserted definition, not proven.
  • domain assumption The seven-category taxonomy (embodied, web, scheduling, games, task automation, text reasoning, agentic subtask) is a meaningful and complete way to organize planning benchmarks.
    The taxonomy is presented without a systematic derivation or validation. The paper does not show that these categories are exhaustive or mutually exclusive.

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Cite this review

Pith. "Pith review of PLANET: A Collection of Benchmarks for Evaluating LLMs' Planning Capabilities." pith.science (2026). https://pith.science/paper/N64CVEHQ

@misc{pith2026250414773,
  author       = {Pith},
  title        = {Pith review of: PLANET: A Collection of Benchmarks for Evaluating LLMs' Planning Capabilities},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/N64CVEHQ}},
  note         = {Machine review of arXiv:2504.14773}
}
read the original abstract

Planning is central to agents and agentic AI. The ability to plan, e.g., creating travel itineraries within a budget, holds immense potential in both scientific and commercial contexts. Moreover, optimal plans tend to require fewer resources compared to ad-hoc methods. To date, a comprehensive understanding of existing planning benchmarks appears to be lacking. Without it, comparing planning algorithms' performance across domains or selecting suitable algorithms for new scenarios remains challenging. In this paper, we examine a range of planning benchmarks to identify commonly used testbeds for algorithm development and highlight potential gaps. These benchmarks are categorized into embodied environments, web navigation, scheduling, games and puzzles, and everyday task automation. Our study recommends the most appropriate benchmarks for various algorithms and offers insights to guide future benchmark development.

Figures

Figures reproduced from arXiv: 2504.14773 by the authors.

Figure 1
Figure 1. Sourced from ALFWorld (Shridhar et al., 2021), this example illustrates interactive alignment between text and embodied worlds. Embodied environments refer to scenarios where an LLM-based agent interacts with a physical or simulated world, engaging with objects and navigating spaces. It is used to evaluate planning systems that employ dis￾crete action spaces and are typically limited to home tasks. Blocksworld (Gupt… view at source ↗
Figure 2
Figure 2. Directly adapted from VisualWebArena (Koh et al., 2024), this example shows an agent’s action trajectory to block the author of a target image post in /f/memes. about web page structure, handle tools like search bars or buttons, and manage long sequences of interactions. A few influential datasets include: WebShop (Yao et al., 2023a) is a dataset that simulates an online shopping website for training web-based AI ag… view at source ↗
Figure 3
Figure 3. Adapted from Natural Plan (Zheng et al., 2024), this example illustrates meeting times and locations for a group of friends. The objective is to maximize the number of friends one can meet, considering constraints such as travel time between locations. 4 Planning for Scheduling Planning is necessary for scheduling, as it ensures that time and resources are properly man￾aged, tools are used as needed, and intended go… view at source ↗
Figures from the paper (3 more)
Figure 3.1
Figure 3.1. Figure 3.1: An example Maze problem in 3x3 grid. The prompt summarizes the Maze structure. bos create 0 2 c0 c3 close 0 2 c0 c3 create 0 1 c1 c2 close 0 1 c1 c2 create 0 0 c2 c1 create 1 1 c2 c1 close 0 0 c2 c1 create 1 0 c3 c0 close 1 0 c3 c0 plan 0 2 plan 0 1 plan 0 0 plan 1 0…
Figure 3.2
Figure 3.2. Figure 3.2: Caption 2,000). Each bidder operates with a budget (e.g., [PITH_FULL_IMAGE:figures/full_fig_p006_3_2.png]
Figure 5
Figure 5. Figure 5: Adapted from RAP (Hao et al., 2023), this figure illustrates plan generation in BlocksWorld (left), mathematical reasoning in GSM8K (center), and logical reasoning in PrOntoQA (right). the ongoing limitations of LLMs in performing tasks that require structured, long-fo…

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Forward citations

Cited by 1 Pith paper

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    Frontier LLMs exceed human performance on easy Wikipedia navigation tasks but finish fewer than 25% of hard games, with failures driven by looping and an inability to replan after mistakes.

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Pith tools

Reviewed August 16, 2026 · model on record in the stance chip above.