Harvey and Jus Mundi announce an agent-to-agent alliance integrating Jus AI into the Harvey platform

Harvey and Jus Mundi have announced an alliance under which Jus Mundi's specialised agent —Jus AI— is integrated directly into Assistant, Agents, Vault and Workflows, Harvey's work environments. According to the announcement published by Harvey on 4 November 2026, the aim is for international arbitration and cross-border litigation teams to have legal research backed by authoritative citations within the same environment in which they review case files and draft their submissions.

Jus Mundi is a global legal intelligence platform specialised in arbitration and international law, and Harvey is one of the legal AI providers with the largest deployment across law firms and in-house legal departments. The deal is presented as an "agent-to-agent" alliance: it is not just about connecting a database, but about making two specialised AI systems interoperate.

What the integration brings

The key to the announcement is that Jus Mundi's research arrives "at the matter itself, without the matter leaving Harvey". In the company's description, a professional can check their client's position against relevant awards, treaty practice and institutional rules, and then compare that research with the case file documents, all within the same work environment.

The integration touches Harvey's four main components:

• Assistant: the conversational assistant can now invoke Jus AI's specialised arbitration research.
• Agents: Harvey's agents can incorporate the Jus Mundi agent as part of automated workflows.
• Vault: the firm's document repository connects with external research without taking documents out of the secure environment.
• Workflows: predefined flows can integrate consultation of arbitration sources as one more step in the process.

The declared result is "citation-backed" research within the environment where legal work happens, instead of the traditional back-and-forth between the database and the word processor.

Arbitration-specific workflows

The announcement details several concrete capabilities of the integration. Jus AI runs inside Harvey's Workflows, Agents and Assistant for the recurrent work of a litigation team: from drafting a Request for Arbitration and verifying the authority of a source mid-document to reviewing exhibit bundles against precedent and flagging clauses that cite superseded international rules. The integration is delivered, moreover, within Harvey's existing security, confidentiality and data governance controls, at the enterprise grade characteristic of the platform.

Jus AI runs on Jus AI Tenet v5, Jus Mundi's proprietary model trained for arbitration, which draws on its arbitration database —described by the company as the most comprehensive in the world— with content from leading arbitral institutions and publishers, including the reference work Redfern and Hunter on International Arbitration, and with every answer traceable to its source.

The companies' statements

"We built Jus AI to reason the way arbitration and international law practitioners reason," says Jean-Rémi de Maistre, CEO and co-founder of Jus Mundi, stressing that every answer is traceable to its source and that, with Harvey, "that intelligence now reaches the matter itself, at the world's most sophisticated firms." John Haddock, Chief Business Officer of Harvey, highlights for his part that "lawyers no longer have to leave their workspace to reach specialised arbitration research: they have it next to the context of their own matter in Harvey." Emmanuel Jacomy, partner at A&O Shearman —the first firm to adopt Harvey at enterprise scale— adds that AI "is most useful when anchored in sources lawyers can trust, like Jus AI", and that the combination of the two offers arbitration teams "a new way of working, with more time to advocate for clients and for strategic tasks".

Availability

Jus AI will be available in Harvey to joint customers worldwide at no additional cost before the end of the year. Firms with a Harvey subscription and a Jus AI plan will be able to activate it through their Jus Mundi account team. The announcement also coincides with Harvey's physical expansion, which has communicated the opening of offices in Tokyo and Boston.

The agent-to-agent pattern

The formula chosen by both companies follows a growing trend in the industry: instead of each provider building its own generalist model for everything, specialised agents connect with one another. Jus Mundi brings coverage and specialisation in international arbitration —awards, treaties, rules of arbitral institutions— and Harvey brings the work environment where the firm reviews documents, drafts and coordinates the case.

For the sector, the interest of the announcement lies in the architecture: legal AI is being reorganised into layers, with orchestration platforms integrating third-party specialised capabilities. It is a different pattern from monolithic deployment and raises new practical questions: what case data is shared with the integrated agent, under what conditions it is processed, and how the traceability of answers involving two systems is documented.

The usual cautions, now with two systems

For the firm evaluating this kind of integration, the due diligence questions do not disappear; they double. Legal research generated or assisted by AI requires verification of citations —the awards and rules referenced must exist and say what is attributed to them— and when two chained systems are involved it is worth knowing which of them provides each statement. The questions about processing of case file data, retention, providers and traceability are the same ones raised by any procurement of legal AI with specific clauses, now adding the layer of agent interoperability.

It is also worth placing the announcement in context: it is corporate news from the two companies, without quantified results on accuracy or savings. As with other launches in the sector, serious evaluation will come with real use by arbitration teams.

Context: the consolidation of the legaltech ecosystem

The alliance comes at a time of intense activity for Harvey, which in recent weeks has presented its proposal for legal work orchestration with agents and has seen third parties such as Legatics connect their live operations with its platform. The market is also witnessing a funding race among the major providers —Harvey and Legora concentrated 1.1 billion in one month— and massive deployments such as Legora's across Fieldfisher's 1,400 professionals. In that map, the integration with Jus Mundi strengthens Harvey in a high-value segment —international arbitration— where the quality and comprehensiveness of sources is the decisive argument.

Frequently asked questions

What have Harvey and Jus Mundi announced?

An alliance under which Jus AI, Jus Mundi's agent specialised in arbitration and international law, is integrated into Harvey's Assistant, Agents, Vault and Workflows.

What is Jus AI?

The AI agent of Jus Mundi, a platform specialised in legal intelligence for international arbitration and cross-border litigation.

What does it mean that the alliance is "agent-to-agent"?

That two specialised AI systems interoperate: Jus Mundi's agent provides arbitration research inside Harvey's work environment, without the case file leaving it.

When was it announced?

On 4 November 2026, on Harvey's corporate blog.

What should firms using it verify?

The existence and accuracy of the citations provided, which system generates each answer, and the conditions of processing and traceability of the case file data.

Sources

• Harvey: "Harvey & Jus Mundi Announce an Agent-to-Agent Partnership Bringing Jus AI within Harvey" (4-11-2026)