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Reflexion: Language Agents with Verbal Reinforcement Learning

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211 Pith papers citing it
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abstract

Large language models (LLMs) have been increasingly used to interact with external environments (e.g., games, compilers, APIs) as goal-driven agents. However, it remains challenging for these language agents to quickly and efficiently learn from trial-and-error as traditional reinforcement learning methods require extensive training samples and expensive model fine-tuning. We propose Reflexion, a novel framework to reinforce language agents not by updating weights, but instead through linguistic feedback. Concretely, Reflexion agents verbally reflect on task feedback signals, then maintain their own reflective text in an episodic memory buffer to induce better decision-making in subsequent trials. Reflexion is flexible enough to incorporate various types (scalar values or free-form language) and sources (external or internally simulated) of feedback signals, and obtains significant improvements over a baseline agent across diverse tasks (sequential decision-making, coding, language reasoning). For example, Reflexion achieves a 91% pass@1 accuracy on the HumanEval coding benchmark, surpassing the previous state-of-the-art GPT-4 that achieves 80%. We also conduct ablation and analysis studies using different feedback signals, feedback incorporation methods, and agent types, and provide insights into how they affect performance.

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  • abstract Large language models (LLMs) have been increasingly used to interact with external environments (e.g., games, compilers, APIs) as goal-driven agents. However, it remains challenging for these language agents to quickly and efficiently learn from trial-and-error as traditional reinforcement learning methods require extensive training samples and expensive model fine-tuning. We propose Reflexion, a novel framework to reinforce language agents not by updating weights, but instead through linguistic feedback. Concretely, Reflexion agents verbally reflect on task feedback signals, then maintain the

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MemMorph: Tool Hijacking in LLM Agents via Memory Poisoning

cs.CR · 2026-05-24 · unverdicted · novelty 8.0

MemMorph poisons LLM agent long-term memory with three crafted records disguised as facts or policies to hijack tool selection, reaching 85.9% success rate across 10 backbones and outperforming baselines while resisting tested defenses.

AlgoBench: Benchmarking Algorithmic Adaptation in Code Generation

cs.SE · 2026-06-30 · unverdicted · novelty 7.0

AlgoBench creates traceable variants of competitive programming problems via constraint shifts that invalidate original algorithms, paired with complexity metrics that reveal LLMs often produce functionally correct but asymptotically unsuitable solutions.

What Drives Interactive Improvement from Feedback?

cs.AI · 2026-06-29 · unverdicted · novelty 7.0

Controlled student-teacher experiments across four benchmarks show interactive gains are driven more by the student's ability to use feedback than by teacher quality, with self-feedback adding little beyond unguided retries.

Self-Harness: Harnesses That Improve Themselves

cs.CL · 2026-06-08 · unverdicted · novelty 7.0

Self-Harness lets LLM agents autonomously refine their interaction harnesses through weakness mining, proposal generation, and validation, raising held-out pass rates on Terminal-Bench-2.0 from 40.5% to 61.9%, 23.8% to 38.1%, and 42.9% to 57.1% across three models.

eMEM: A Hybrid Spatio-Temporal Memory System For Embodied Agents

cs.RO · 2026-06-02 · unverdicted · novelty 7.0

eMEM is a multi-index memory architecture with tiered consolidation and ten recall tools for embodied agents, scoring 80.8 weighted mean on eMEM-Bench covering eight cognitive psychology paradigms and outperforming a flat RAG baseline on context and lure rejection tasks.

LongDS-Bench: On the Failure of Long-Horizon Agentic Data Analysis

cs.LG · 2026-05-28 · unverdicted · novelty 7.0

LongDS benchmark shows state-of-the-art agents achieve only 48.45% accuracy on long-horizon data analysis tasks, with performance dropping 47 points from early to late turns and state-maintenance errors causing most failures.

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