Home - Open Semantic Interchange

The Universal Standard for

Semantic Data

The Open Semantic Interchange is an industry-wide specification effort to standardize how we exchange semantic metadata across analytics, AI and BI platforms, providing a vendor neutral, single source of truth for semantic data.

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100%<br>Vendor Neutral

YAML<br>Configuration

Apache 2.0<br>Open Source

AI Ready<br>Semantic Context

Write Once,

Query Anywhere.

Stop redefining "Revenue" in every dashboard. OSI uses a declarative YAML standard to define metrics, dimensions, and joins — so every tool and agent in your stack works from the same source of truth.

Consistent Definitions

Ensure Marketing, Finance, and Sales all see the same numbers — no more metric drift.

AI-Ready Context

Give LLMs the semantic context they need to answer business questions accurately.

No Lock-In

Move your business logic between platforms freely. Your metrics belong to you.

sales_analytics.osi.yaml

semantic_model:<br>- name: ecommerce_analytics<br>description: Sales and customer analytics<br>ai_context:<br>instructions: "Use for sales analysis"

datasets:<br>- name: orders<br>source: sales.public.orders<br>primary_key: [order_id]<br>fields:<br>- name: order_date<br>dimension:<br>is_time: true

metrics:<br>- name: total_revenue<br>expression:<br>dialects:<br>- dialect: ANSI_SQL<br>expression: SUM(orders.amount)

About OSI

The Open Semantic Interchange (OSI) is a collaborative, open-source effort dedicated to standardizing and streamlining semantic model definitions across the data analytics, AI, and BI ecosystem.

Interoperability

Seamlessly exchange semantic models between AI agents, BI platforms, and analytics tools.

Consistency

Maintain consistent data definitions and values across every platform in your ecosystem.

Vendor-Agnostic

A common standard that works across all vendors, eliminating tool-specific inconsistencies and lock-in.

Efficiency

Reduce engineering debt and accelerate innovation by using a unified, governed semantic foundation.

The Challenge<br>Semantic Fragmentation

&times;

Metric Drift<br>Inconsistent KPIs across different dashboards.

&times;

Manual Translation<br>Costly, error-prone reconciliation efforts.

&times;

Hallucinations<br>Unreliable AI grounding from conflicting data logic.

&times;

Integration Debt<br>Complex N-to-N custom integrations between proprietary tools.

The Solution<br>A Unified Standard

Single Source of Truth<br>Unified semantic and metric definitions.

Native Interoperability<br>Direct exchange between platforms and AI agents.

Trusted AI Grounding<br>Agents reasoning accurately based on business logic.

Reduced TCO<br>Lower costs through automated model exchange.

Core Classes

The OSI specification defines these building blocks:

Semantic Model<br>Top-level container representing a complete model with datasets, relationships, and metrics.

Datasets<br>Logical business entities — fact and dimension tables with fields and structure.

Fields<br>Row-level attributes for grouping, filtering, and metric expressions.

Metrics<br>Aggregate calculations — sums, averages, ratios — spanning multiple datasets.

Dimensions<br>Categorical attributes: Where, When, Who.

Relationships<br>Foreign key constraints connecting datasets, supporting simple and composite keys.

Working Group Members

Leading organizations collaborating to build the future of semantic interchange

Alation

Ataccama

Anomalo

Atlan

AtScale

Bigeye

BlackRock

Blue Yonder

CARTO

Cloudera

Coalesce

Collate

Collibra

Cogniti

Count

Credible

Cube

Dataiku

Databricks

DataHub

Denodo

dbt Labs

Dremio

Domo

Elementum AI

Entropy Data

Firebolt

GoodData

Hex

Honeydew

Informatica

Instacart

JetBrains

Lightdash

Metabase

Mistral AI

Omni

Oracle

Preset

Qlik

RelationalAI

Salesforce

Select Star

ServiceNow

Sigma

Snowflake

Starburst Data

Strategy

Sundial

ThoughtSpot

Zeta Global

Working Groups

The initiative is organized into focused groups, each tackling a specific area of the specification.

Advanced Metrics & Expression Language<br>Complex metric calculations and a portable expression syntax

Composability<br>Enabling semantic models to reference and extend one another

Catalog Integration<br>Bridging OSI models with data catalog and governance platforms

Ontology Representation<br>Mapping OSI concepts to formal ontology standards

Model Converters & Developer Tools<br>Tooling for importing, exporting, and validating OSI models

Get Involved

Join our open-source community on GitHub. Help shape the future of semantic interchange.

View Repository<br>Browse the spec, raise PRs, and contribute code.

Start a Discussion<br>Share ideas, propose features, and ask questions.

Contribute Tools<br>Build converters, validators, and developer tooling.

Latest Updates

News and announcements from the OSI community

June 4, 2026

The FSI Semantic Working Group Is Live

The Financial Services Semantic Working Group has held its first formal meeting, bringing together practitioners from across banking, insurance, asset...