Planning in the LLM Era: Building for Reliability and Efficiency
Pith reviewed 2026-05-22 06:48 UTC · model grok-4.3
The pith
LLMs are shifting from directly generating plans to creating verifiable symbolic solvers for families of problems.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
The paper claims that the planning field is realigning in the LLM era by moving away from single-shot and hybrid approaches and toward using LLMs at solution construction time to generate symbolic solvers for families of problems. These solvers can be verified and then used efficiently at inference time, supporting agents that are reliable and resource-efficient while maintaining minimal dependence on language models during operation.
What carries the argument
Planner-generation methods that task LLMs with producing verifiable symbolic solvers for problem families, which are then deployed independently of the model.
If this is right
- Agents gain reliability because solutions come from verified symbolic solvers rather than direct model output.
- Inference-time resource demands drop since the language model is no longer needed for each planning request.
- Generated planners become maintainable with far less ongoing reliance on large language models.
- Research can prioritize improvements in solver generation and verification to widen applicability.
Where Pith is reading between the lines
- The same construction-time generation pattern could be explored for other agent capabilities such as reasoning or tool use.
- Empirical tests on concrete application domains would clarify whether the efficiency gains hold in practice.
- Integration with established symbolic planning systems might produce hybrid tools that combine verification with learned generation.
Load-bearing premise
The limitations of single-shot and hybrid LLM planning are inherent to those methods, and planner-generation approaches meaningfully overcome them for problems not encountered during generation.
What would settle it
An experiment showing that single-shot or hybrid LLM planning matches or exceeds the reliability and efficiency of generated symbolic solvers on a diverse set of previously unseen planning problems would challenge the central claim.
Figures
read the original abstract
Growing attention to intelligent agents has put a spotlight on one of their central capabilities: planning. Early attempts to leverage large language models (LLMs) for planning relied on single-shot plan generation, followed by hybrid approaches that coupled LLMs with limited external search. These methods, unsound and incomplete by their very nature, often require substantial resources without yielding better solutions on unseen problems. As the limitations of LLMs become clearer, recent work has shifted toward using them at solution construction time -- generating symbolic solvers for a family of problems that can be verified and then used efficiently at inference time. This trend reflects the growing need for agents that are both reliable and resource-efficient. It also offers a path towards generating maintainable planners with minimal dependence on language models at inference time. In this paper, we argue that this shift reflects a broader realignment of the planning field in the LLM era. We examine three major categories of planner-generation methods, discuss their current limitations, and outline research steps towards a more reliable and efficient LLM-based generation of planners.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper claims that early LLM-based planning relied on single-shot plan generation and hybrid LLM-external search methods, which are unsound and incomplete by nature and often fail to yield better solutions on unseen problems despite high resource costs. It argues that the field is shifting toward using LLMs at solution construction time to generate verifiable symbolic solvers for families of problems; these solvers can then be used efficiently at inference time with minimal LLM dependence. The manuscript examines three major categories of such planner-generation methods, discusses their limitations, and outlines research steps toward more reliable and efficient LLM-based planner generation.
Significance. If the central thesis holds and the generated planners generalize reliably, this realignment could enable more maintainable, verifiable, and resource-efficient planning for intelligent agents, reducing runtime dependence on LLMs. The significance hinges on whether verification in these approaches addresses soundness gaps for unseen problems, an aspect the manuscript does not fully substantiate.
major comments (2)
- [Section 3] Section 3: The discussion of the three categories of planner-generation methods describes verification steps and efficiency gains at inference time but provides no formal argument, proof sketch, or cited empirical result showing that verification catches failures under distribution shift in problem structure or constraints for unseen instances.
- [Abstract] Abstract: The claim that single-shot and hybrid methods are 'unsound and incomplete by their very nature' and 'often require substantial resources without yielding better solutions on unseen problems' is central to motivating the realignment, yet the manuscript offers no specific evidence, data, or detailed analysis to support this characterization or the comparison to newer approaches.
minor comments (1)
- The manuscript would benefit from an explicit early definition or taxonomy of the three planner-generation categories to improve accessibility for readers new to the subfield.
Simulated Author's Rebuttal
We thank the referee for their constructive feedback on our manuscript. We address each major comment below, indicating planned revisions where appropriate to strengthen the presentation of our position.
read point-by-point responses
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Referee: [Section 3] Section 3: The discussion of the three categories of planner-generation methods describes verification steps and efficiency gains at inference time but provides no formal argument, proof sketch, or cited empirical result showing that verification catches failures under distribution shift in problem structure or constraints for unseen instances.
Authors: We agree that Section 3 would benefit from a more explicit treatment of verification under distribution shift. The manuscript is a position paper that surveys emerging planner-generation approaches and their reported verification mechanisms from the literature, rather than presenting new formal proofs or original empirical results. In revision, we will expand the section to discuss the challenges of verifying soundness for unseen problem structures, reference relevant empirical findings from cited works where they exist, and emphasize this as a key open issue aligned with the research steps we already outline. revision: yes
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Referee: [Abstract] Abstract: The claim that single-shot and hybrid methods are 'unsound and incomplete by their very nature' and 'often require substantial resources without yielding better solutions on unseen problems' is central to motivating the realignment, yet the manuscript offers no specific evidence, data, or detailed analysis to support this characterization or the comparison to newer approaches.
Authors: The abstract statements summarize well-documented limitations of early LLM planning methods as established in the broader literature. To provide the requested support, we will revise the abstract for precision and add targeted references plus brief illustrative analysis in the introduction, drawing on specific studies that document unsoundness, incompleteness, and performance degradation on unseen instances for single-shot and hybrid approaches. This will ground the motivation without changing the paper's core argument. revision: yes
Circularity Check
No circularity: observational position paper on field trends
full rationale
The paper presents an observational summary of trends in LLM-based planning, categorizing single-shot, hybrid, and planner-generation methods while discussing limitations and future directions. It contains no equations, derivations, fitted parameters, or self-referential definitions that reduce claims to their own inputs. The central argument relies on external literature and field observations rather than internal reductions or load-bearing self-citations, rendering the analysis self-contained against external benchmarks with no detectable circular steps.
Axiom & Free-Parameter Ledger
Lean theorems connected to this paper
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IndisputableMonolith/Cost/FunctionalEquation.leanwashburn_uniqueness_aczel unclear?
unclearRelation between the paper passage and the cited Recognition theorem.
recent work has shifted toward using them at solution construction time -- generating symbolic solvers for a family of problems that can be verified and then used efficiently at inference time
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IndisputableMonolith/Foundation/RealityFromDistinction.leanreality_from_one_distinction unclear?
unclearRelation between the paper passage and the cited Recognition theorem.
We examine three major categories of planner-generation methods
What do these tags mean?
- matches
- The paper's claim is directly supported by a theorem in the formal canon.
- supports
- The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
- extends
- The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
- uses
- The paper appears to rely on the theorem as machinery.
- contradicts
- The paper's claim conflicts with a theorem or certificate in the canon.
- unclear
- Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.
Reference graph
Works this paper leans on
-
[1]
Asai, M.; and Fukunaga, A. 2018. Classical Planning in Deep Latent Space: Bridging the Subsymbolic-Symbolic Boundary. In Proceedings of the Thirty-Second AAAI Conference on Artificial Intelligence ( AAAI 2018) , 6094--6101. AAAI Press
work page 2018
- [2]
-
[3]
Besta, M.; Blach, N.; Kubicek, A.; Gerstenberger, R.; Podstawski, M.; Gianinazzi, L.; Gajda, J.; Lehmann, T.; Niewiadomski, H.; Nyczyk, P.; and Hoefler, T. 2024. Graph of Thoughts: Solving Elaborate Problems with Large Language Models. In Dy, J.; and Natarajan, S., eds., Proceedings of the Thirty-Eighth AAAI Conference on Artificial Intelligence ( AAAI 20...
work page 2024
-
[4]
Caglar, T.; Belhaj, S.; Chakraborti, T.; Katz, M.; and Sreedharan, S. 2024. Can LLM s Fix Issues with Reasoning Models? Towards More Likely Models for AI Planning. In Dy, J.; and Natarajan, S., eds., Proceedings of the Thirty-Eighth AAAI Conference on Artificial Intelligence ( AAAI 2024) , 20061--20069. AAAI Press
work page 2024
-
[5]
Cao, D.; Katz, M.; Kokel, H.; Srinivas, K.; and Sohrabi, S. 2024. Automating T hought of S earch: A Journey Towards Soundness and Completeness. In NeurIPS 2024 Workshop on Open-World Agents
work page 2024
-
[6]
Corr \^e a, A. B.; Giacomo, G. D.; Helmert, M.; and Rubin, S. 2024. Planning with Object Creation. In Bernardini, S.; and Muise, C., eds., Proceedings of the Thirty-Fourth International Conference on Automated Planning and Scheduling (ICAPS 2024), 104--113. AAAI Press
work page 2024
-
[7]
Frontier Large Language Models Rival State-of-the-Art Planners
Corr \^e a, A. B.; Pereira, A. G.; and Seipp, J. 2025 a . The 2025 Planning Performance of Frontier Large Language Models. arXiv:2511.09378
work page internal anchor Pith review Pith/arXiv arXiv 2025
-
[8]
Corr \^e a, A. B.; Pereira, A. G.; and Seipp, J. 2025 b . Classical Planning with LLM-Generated Heuristics: Challenging the State of the Art with Python Code. In Proceedings of the Thirty-Eight Annual Conference on Neural Information Processing Systems ( NeurIPS 2025)
work page 2025
-
[9]
Echchahed, A.; and Castro, P. S. 2025. A Survey of State Representation Learning for Deep Reinforcement Learning. Trans. Mach. Learn. Res., 2025
work page 2025
- [10]
-
[11]
Guan, L.; Valmeekam, K.; Sreedharan, S.; and Kambhampati, S. 2023. Leveraging pre-trained large language models to construct and utilize world models for model-based task planning. In Proceedings of the Thirty-Seventh Annual Conference on Neural Information Processing Systems ( NeurIPS 2023) , 79081--79094
work page 2023
-
[12]
Hao, S.; Gu, Y.; Ma, H.; Hong, J.; Wang, Z.; Wang, D.; and Hu, Z. 2023. Reasoning with Language Model is Planning with World Model. In Proceedings of the 2023 Conference on Empirical Methods in Natural Language Processing ( EMNLP 2023)
work page 2023
-
[13]
Hodel, N. 2024. Exploring the use of LLMs in generalized planning. Bachelor's thesis, Saarland University
work page 2024
-
[14]
Huang, S.; Lipovetzky, N.; and Cohn, T. 2025. Planning in the Dark: LLM-Symbolic Planning Pipeline Without Experts. In Walsh, T.; Shah, J.; and Kolter, Z., eds., Proceedings of the Thirty-Nineth AAAI Conference on Artificial Intelligence ( AAAI 2025) , 26542--26550. AAAI Press
work page 2025
-
[15]
Jim \'e nez, S.; Segovia-Aguas, J.; and Jonsson, A. 2019. A Review of Generalized Planning. The Knowledge Engineering Review, 34: e5
work page 2019
-
[16]
Kambhampati, S.; Valmeekam, K.; Guan, L.; Verma, M.; Stechly, K.; Bhambri, S.; Saldyt, L. P.; and Murthy, A. B. 2024. Position: LLM s Can t Plan, But Can Help Planning in LLM -Modulo Frameworks. In Proceedings of the 41st International Conference on Machine Learning (ICML 2024) . JMLR .org
work page 2024
-
[17]
Katz, M.; Kokel, H.; and Sreedharan, S. 2025. Seemingly Simple Planning Problems are Computationally Challenging: The Countdown Game. arXiv:2508.02900 [cs.AI]
work page internal anchor Pith review Pith/arXiv arXiv 2025
-
[18]
Katz, M.; Kokel, H.; Srinivas, K.; and Sohrabi, S. 2024. Thought of Search: Planning with Language Models Through The Lens of Efficiency. In Proceedings of the Thirty-Seventh Annual Conference on Neural Information Processing Systems ( NeurIPS 2024)
work page 2024
-
[19]
Konidaris, G.; Kaelbling, L. P.; and Lozano-Perez, T. 2018. From skills to symbols: Learning symbolic representations for abstract high-level planning. Journal of Artificial Intelligence Research, 61: 215--289
work page 2018
-
[20]
Liang, J.; Huang, W.; Xia, F.; Xu, P.; Hausman, K.; Ichter, B.; Florence, P.; and Zeng, A. 2023. Code as Policies: Language Model Programs for Embodied Control. In 2023 IEEE International Conference on Robotics and Automation (ICRA), 9493--9500
work page 2023
-
[21]
F.; Hayton, T.; Porteous, J.; and Gregory, P
Lindsay, A.; Read, J.; Ferreira, J. F.; Hayton, T.; Porteous, J.; and Gregory, P. 2017. Framer: Planning Models from Natural Language Action Descriptions. In Barbulescu, L.; Frank, J.; Mausam; and Smith, S. F., eds., Proceedings of the Twenty-Seventh International Conference on Automated Planning and Scheduling (ICAPS 2017), 434--442. AAAI Press
work page 2017
-
[22]
McDermott, D.; Ghallab, M.; Howe, A.; Knoblock, C.; Ram, A.; Veloso, M.; Weld, D.; and Wilkins, D. 1998. PDDL -- The Planning Domain Definition Language -- Version 1.2. Technical Report CVC TR-98-003/DCS TR-1165, Yale Center for Computational Vision and Control, Yale University
work page 1998
-
[23]
Oswald, J.; Srinivas, K.; Kokel, H.; Lee, J.; Katz, M.; and Sohrabi, S. 2024. Large Language Models as Planning Domain Generators. In Bernardini, S.; and Muise, C., eds., Proceedings of the Thirty-Fourth International Conference on Automated Planning and Scheduling (ICAPS 2024). AAAI Press
work page 2024
-
[24]
Palacios, H.; and Geffner, H. 2009. Compiling Uncertainty Away in Conformant Planning Problems with Bounded Width. Journal of Artificial Intelligence Research, 35: 623--675
work page 2009
- [25]
-
[26]
Shinn, N.; Cassano, F.; Gopinath, A.; Narasimhan, K.; and Yao, S. 2023. Reflexion: language agents with verbal reinforcement learning. In Proceedings of the Thirty-Seventh Annual Conference on Neural Information Processing Systems ( NeurIPS 2023)
work page 2023
-
[27]
Silver, T.; Dan, S.; Srinivas, K.; Tenenbaum, J.; Pack Kaelbling , L.; and Katz, M. 2024. Generalized Planning in PDDL Domains with Pretrained Large Language Models. In Dy, J.; and Natarajan, S., eds., Proceedings of the Thirty-Eighth AAAI Conference on Artificial Intelligence ( AAAI 2024) . AAAI Press
work page 2024
-
[28]
S.; Kumar, N.; Lozano-P \'e rez, T.; and Kaelbling, L
Silver, T.; Hariprasad, V.; Shuttleworth, R. S.; Kumar, N.; Lozano-P \'e rez, T.; and Kaelbling, L. P. 2022. PDDL Planning with Pretrained Large Language Models. In NeurIPS 2022 Workshop on Foundation Models for Decision Making
work page 2022
-
[29]
Singh, I.; Blukis, V.; Mousavian, A.; Goyal, A.; Xu, D.; Tremblay, J.; Fox, D.; Thomason, J.; and Garg, A. 2023. ProgPrompt: Generating Situated Robot Task Plans using Large Language Models. In 2023 IEEE International Conference on Robotics and Automation (ICRA), 11523--11530
work page 2023
-
[30]
Sohrabi, S.; Riabov, A. V.; Katz, M.; and Udrea, O. 2018. An AI Planning Solution to Scenario Generation for Enterprise Risk Management. In Proceedings of the Thirty-Second AAAI Conference on Artificial Intelligence ( AAAI 2018) , 160--167. AAAI Press
work page 2018
- [31]
- [32]
-
[33]
Sun, H.; Zhuang, Y.; Kong, L.; Dai, B.; and Zhang, C. 2023. AdaPlanner: Adaptive Planning from Feedback with Language Models. In Oh, A.; Naumann, T.; Globerson, A.; Saenko, K.; Hardt, M.; and Levine, S., eds., Advances in Neural Information Processing Systems, volume 36, 58202--58245. Curran Associates, Inc
work page 2023
-
[34]
Tantakoun, M.; Muise, C.; and Zhu, X. 2025. LLM s as Planning Formalizers: A Survey for Leveraging Large Language Models to Construct Automated Planning Models. In Che, W.; Nabende, J.; Shutova, E.; and Pilehvar, M. T., eds., Findings of the Association for Computational Linguistics: ACL 2025. Association for Computational Linguistics
work page 2025
-
[35]
Trivedi, H.; Khot, T.; Hartmann, M.; Manku, R.; Dong, V.; Li, E.; Gupta, S.; Sabharwal, A.; and Balasubramanian, N. 2024. AppWorld: A Controllable World of Apps and People for Benchmarking Interactive Coding Agents. In Ku, L.; Martins, A.; and Srikumar, V., eds., Findings of the Association for Computational Linguistics: ACL 2024, 16022--16076. Associatio...
work page 2024
- [36]
-
[37]
Y.; Rambachan, A.; Kleinberg, J.; and Mullainathan, S
Vafa, K.; Chen, J. Y.; Rambachan, A.; Kleinberg, J.; and Mullainathan, S. 2024. Evaluating the World Model Implicit in a Generative Model. arXiv:2406.03689
-
[38]
Vallati, M.; Bart \' a k, R.; Chrpa, L.; McCluskey, T. L.; and Petrick, R. P. A. 2025. Knowledge Engineering for Planning and Scheduling in the LLM Era. In Harabor, D.; and Ramirez, M., eds., Proceedings of the thirty-fifth International Conference on Automated Planning and Scheduling (ICAPS 2025), 391--395. AAAI Press
work page 2025
-
[39]
Valmeekam, K.; Marquez, M.; Olmo, A.; Sreedharan, S.; and Kambhampati, S. 2023 a . PlanBench: An Extensible Benchmark for Evaluating Large Language Models on Planning and Reasoning about Change. In Proceedings of the Thirty-Seventh Annual Conference on Neural Information Processing Systems ( NeurIPS 2023) , 38975--38987
work page 2023
-
[40]
Valmeekam, K.; Marquez, M.; Sreedharan, S.; and Kambhampati, S. 2023 b . On the Planning Abilities of Large Language Models - A Critical Investigation. In Proceedings of the Thirty-Seventh Annual Conference on Neural Information Processing Systems ( NeurIPS 2023)
work page 2023
-
[41]
Wang, X.; Chen, Y.; Yuan, L.; Zhang, Y.; Li, Y.; Peng, H.; and Ji, H. 2024. Executable Code Actions Elicit Better LLM Agents. In Proceedings of the 41st International Conference on Machine Learning (ICML 2024) . OpenReview.net
work page 2024
-
[42]
Yao, S.; Yu, D.; Zhao, J.; Shafran, I.; Griffiths, T.; Cao, Y.; and Narasimhan, K. 2023. Tree of thoughts: Deliberate problem solving with large language models. In Proceedings of the Thirty-Seventh Annual Conference on Neural Information Processing Systems ( NeurIPS 2023)
work page 2023
-
[43]
Zhou, S.; Xu, F. F.; Zhu, H.; Zhou, X.; Lo, R.; Sridhar, A.; Cheng, X.; Ou, T.; Bisk, Y.; Fried, D.; Alon, U.; and Neubig, G. 2024. WebArena: A Realistic Web Environment for Building Autonomous Agents. In Proceedings of the Twelfth International Conference on Learning Representations (ICLR 2024). OpenReview.net
work page 2024
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