LLM Agents Negotiate Supply Chain Contracts: Performance, Reliability, and Strategy

Chen Liang, Fasheng Xu· August 11, 2026 View original

Key takeaways

  • LLM agents can successfully negotiate, but often with efficiency losses due to longer negotiation rounds.
  • Lower-tier LLMs may accept irrational contracts, necessitating strong guardrails.
  • The choice of LLM provider significantly impacts how surplus is divided in negotiations.
  • Prompt engineering is a powerful tool to influence an agent's negotiation strategy and outcome.

Who benefits

Supply ChainManufacturingRetailLogisticsE-commerce

Summary

This research evaluates nine LLM agents in supply chain bargaining, benchmarking them against a Perfect Bayesian Equilibrium. It finds that agent capability drives value creation and reliability, provider identity influences surplus capture, and prompt design is a critical strategic lever for negotiation outcomes.

As Large Language Model (LLM) agents transition from decision support to autonomous roles, particularly in procurement, understanding their negotiation capabilities is crucial for businesses. This study investigates how LLM agents perform in a supply chain bargaining scenario where a buyer possesses private demand information and negotiates a quantity-payment contract with an uninformed seller. Nine different LLMs from major providers like OpenAI, Google, and Alibaba were benchmarked against a validated Perfect Bayesian Equilibrium across nearly 10,000 LLM-to-LLM negotiations. The findings highlight several key aspects. Firstly, agent capability directly correlates with value creation and reliability; while agents agreed in most negotiations and captured significant surplus, they took longer than optimal, leading to 21-34% surplus erosion. Lower-tier models also accepted irrational contracts more frequently, emphasizing the need for automated profit verification. Secondly, surplus capture is relational, with provider identity being a stronger predictor than capability rank. For instance, self-play buyers from OpenAI, Google, and Alibaba's Qwen captured average shares of 40%, 50%, and 70% respectively, indicating that vendor choice is a significant distributional decision. Finally, prompt design emerges as a powerful strategic lever. The ability to separate the principal's economic patience from the agent's prompted strategic patience is a free deployment choice that accounts for 90% of the explained variance in surplus division. This comprehensive audit establishes an equilibrium-referenced framework for evaluating AI agents based on discounted efficiency, distributional profiles, and operational reliability.

Why it matters

Professionals in procurement, supply chain management, and AI strategy need to understand the nuances of deploying LLM agents for negotiation, including their efficiency, reliability, and how strategic prompting and vendor choice impact outcomes. This research provides critical insights for effective autonomous agent deployment.

How to implement this in your domain

  1. 1Pilot LLM agents for specific, well-defined negotiation tasks within your supply chain, starting with low-stakes scenarios.
  2. 2Implement robust automated profit verification and guardrails for any LLM agent delegated with autonomous contracting authority.
  3. 3Carefully select LLM providers, recognizing that provider identity can significantly influence the distribution of negotiated surplus.
  4. 4Experiment with prompt engineering to strategically control agent "patience" and negotiation tactics, aligning them with your business objectives.
  5. 5Conduct internal audits of LLM agent negotiations, benchmarking against established economic equilibria or human performance to assess efficiency and fairness.

Original post by Chen Liang, Fasheng Xu

"arXiv:2608.07538v1 Announce Type: new Abstract: As LLM agents move from decision support to autonomous procurement, firms need to know whether delegated negotiators create value, divide it predictably, and avoid money-losing contracts. We study this in a canonical supply chain ba…"

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Originally posted by Chen Liang, Fasheng Xu on X · view source

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