Harvey AI and Silex are two artificial intelligence solutions for legal professionals, but they do not address exactly the same need. Harvey presents itself as a global AI platform for law firms, legal departments and professional services. Silex is a Swiss legal AI designed for legal research, analysis and reasoning in Swiss law.
To choose between Harvey AI and Silex, you therefore need to look at the use context: an international platform for legal productivity, workflows and large-scale collaboration, or a specialized assistant for Swiss legal research with sourced answers that local practitioners can use.
Quick comparison: Harvey AI and Silex
Harvey and Silex both use AI to help legal professionals, but their positioning differs. Harvey targets a broad platform for legal and professional work: drafting, document analysis, research, agents, integrations and collaborative spaces. Silex focuses on legal assistance for research and analysis in Swiss law.
Positioning
Harvey AI
AI platform for legal and professional services, used by law firms and companies internationally.
Silex
Swiss legal AI built for research, analysis and reasoning in Swiss law.
Use cases
Harvey AI
Drafting, document analysis, legal research, contract intelligence, workflows and agents.
Silex
Swiss legal research, source-grounded analysis, synthesis and preparation of legal answers.
Sources
Harvey AI
Harvey says it allows users to work with trusted sources and regional sources through its ecosystem.
Silex
Silex emphasizes structured and verifiable Swiss legal sources.
Swiss law
Harvey AI
Harvey mentions global presence and regional sources, but does not present itself as a solution exclusively dedicated to Swiss law.
Silex
Silex is designed specifically for professionals working with Swiss law.
Security
Harvey AI
Harvey states SOC 2 Type II, ISO 27001, ISO 27701, ISO 42001, encryption, access controls and no default training on customer data.
Silex
Silex highlights Swiss hosting, confidentiality and zero training on customer data.
What is Harvey AI?
Harvey describes itself as an AI platform built for legal and professional services. Its official page presents several modules: Assistant to ask questions, analyze documents and draft faster; Vault to store and analyze documents; Knowledge to research legal, regulatory and tax questions; Agents to execute workflows; and integrations with tools legal teams already use.
Harvey also states that it is used by law firms, in-house legal teams and professional service networks. Its Company page states 2,400+ customers, presence in 70+ countries and 75+ AmLaw 100 firms using Harvey. These figures are published by Harvey and should be read as such.
Harvey and OpenAI: what is publicly verified
OpenAI published a case study stating that Harvey worked with OpenAI to build a case-law-trained model for legal professionals. According to OpenAI, this work targeted tasks requiring complex reasoning, deep domain knowledge and capabilities beyond a single call to a general-purpose model.
The same source states that Harvey and OpenAI started with Delaware case law before expanding the model to all U.S. case law, and that OpenAI mentions adding the equivalent of 10 billion tokens of data for this case law model. OpenAI also reports that, in a test with large law firms, lawyers preferred the output from the specialized model over GPT-4 in 97% of cases. These data come from OpenAI and concern the context described in that publication, mainly U.S. case law research.
Why Harvey AI is powerful for large organizations
Harvey is particularly oriented toward organizations that want to deploy AI across multiple workflows: due diligence, contract analysis, research, litigation, compliance, drafting, knowledge management and team collaboration. Its platform page mentions uses in Word, Outlook, iManage, NetDocuments, SharePoint, Google Drive, APIs and other work environments.
This platform logic is useful for international firms, large legal departments or organizations that want to industrialize processes. Harvey also emphasizes agents and reusable workflows, which correspond to uses broader than one-off legal research.
Silex: legal AI designed for Swiss law
Silex addresses a more targeted need: helping legal professionals conduct Swiss legal research, analyze relevant sources, structure reasoning and produce a verifiable answer. The goal is not only to generate text, but to support a legal working method adapted to Switzerland.
Swiss law has important specific features: federal law, cantonal law, case law, multilingualism and official sources that must be checked. In this context, a specialized solution may be more relevant than a general international platform, even when that platform is technologically advanced.
To go further, see legal AI, legal analysis and AI case law.
Sources and reliability: the decisive criterion
For a legal professional, the quality of an AI answer depends on source verifiability. Harvey says its ecosystem lets users "ground every answer in sources you trust". Public documentation also shows specific work with OpenAI on U.S. case law research.
For Swiss legal research, the important criterion is different: whether the tool actually works with relevant Swiss sources, whether references are controllable and whether the reasoning remains adapted to the Swiss legal system. Silex was built precisely around this need: sourced answers in an environment designed for Swiss legal practice.
Security and confidentiality
Harvey publishes detailed security information. Its security page mentions enterprise controls, SAML SSO, audit logs, IP allow-listing, data lifecycle management, encryption at rest and in transit, logical separation of customer workspaces, no default training on customer data, and SOC 2 Type II and ISO 27001 audits. Harvey also states localization options, including EU and Switzerland, US or Australia.
Silex also emphasizes confidentiality, with Swiss hosting and a no-training policy on customer data. For lawyers, notaries and in-house counsel, this dimension must be checked contractually: hosting, subprocessors, logs, retention period, access rights, models used and data guarantees.
When Harvey AI may be the right choice
Harvey may be relevant for an international organization looking for a very broad AI platform capable of covering multiple legal and professional workflows: drafting, document analysis, due diligence, research, knowledge management, document integrations and agents. It is especially suited to teams that want to deploy AI at scale across several departments or jurisdictions.
Harvey may also fit law firms or legal departments that already have a complex document environment and want to connect AI to their daily work tools. In that case, the main issue is less specialized Swiss research than the orchestration of many internal uses.
When Silex may be the right choice
Silex may be more suitable when the main need is legal research in Switzerland: finding relevant sources, understanding their scope, obtaining a clear synthesis, checking references and preparing a usable answer. For a Swiss law firm, notarial office, legal department or legal professional working on Swiss law, this specialization is central.
Silex is also relevant if the team wants a solution more directly oriented toward Swiss legal reasoning rather than a global platform deployed across many workflows. For professional use cases, see also AI for lawyers and AI notary.
Harvey AI vs Silex: how to decide?
- Scope: international multi-workflow platform or specialized Swiss law assistant?
- Sources: regional sources and internal documents, or structured Swiss legal corpus?
- Daily use: broad process automation or source-grounded legal research and analysis?
- Organization: global deployment in a large structure or fast adoption by a Swiss legal team?
- Security: check hosting, subprocessors, retention, access and absence of training on your data.
To evaluate Silex on concrete Swiss law cases, you can book a demo. If you compare several tools, ChatGPT vs Silex also explains why a general AI and a specialized legal AI do not meet the same need.
FAQ: Harvey AI vs Silex
Is Harvey AI designed for lawyers?
Yes. Harvey presents itself as an AI platform for legal and professional services, with drafting, document analysis, research, knowledge management and workflow features.
Is Harvey AI specialized in Swiss law?
Harvey's public sources show a global platform used in many countries and oriented toward several legal and professional domains. They do not present Harvey as a solution exclusively specialized in Swiss law.
What is the main difference between Harvey AI and Silex?
Harvey is a global AI platform for legal and professional organizations. Silex is a Swiss legal AI focused on research, analysis and reasoning in Swiss law.
Does Harvey use customer data to train its models?
Harvey states in its security documentation that it does not, by default, use customer inputs, outputs or documents to train underlying models, and that it provides contractual commitments on this point.
Which tool should you choose for Swiss legal research?
If the main need is Swiss legal research with verifiable sources and reasoning adapted to the local context, Silex is built for that use. Harvey may be more relevant for a broad international platform covering many legal workflows.
