Exafunction, Inc.
Windsurf builds AI-powered coding tools that empower developers to dream bigger and be more productive. The company develops the Windsurf Editor, an AI-native IDE with Cascade, an agentic coding assistant that enables developers to code faster and more efficiently.
At a Glance
- Individual developers and software engineers
- Technology startups
- Enterprise software development teams
- Government agencies and defense contractors (DoD, federal agencies)
- +5 more
AI Tools by Exafunction, Inc.
(2)
Windsurf Live
Real Time Collaborative Coding
Windsurf
AI Native Coding Editor
Discussions
Exafunction's Vision for AI in Software Development
Beyond Windsurf, what seems to be Exafunction's broader vision for the future of AI in software engineering? What problems are they trying to solve?
Latest News
GPT-5.2-Codex is now available in Windsurf
Windsurf Wave 13: Merry Shipmas - Parallel agents, Git worktrees, multi-pane Cascade, dedicated terminal, and SWE-1.5 Free
GPT 5.2 is now available in Windsurf
Opus 4.5 is now available in Windsurf - Most capable model yet, available at Sonnet prices for limited time
Products & Services
An AI-native IDE (Integrated Development Environment) that keeps developers in flow. Available on Mac, Windows, and Linux. Features Cascade, an agentic coding assistant that tracks edits, terminal, clipboard, and browser context for context-aware suggestions.
Tool designed to streamline large-scale codebase transformations with agentic capabilities that codes, fixes, and thinks multiple steps ahead.
Intelligent code suggestions, auto-completions, and error corrections available as extensions for VS Code, JetBrains IDEs, Visual Studio, Vim, NeoVim, Jupyter, and Chrome.
Predictive coding experience combining Autocomplete and Supercomplete for fast code generation.
Market Position
Windsurf positions itself as an enterprise-grade AI coding assistant and AI-native IDE that competes directly with GitHub Copilot, Cursor, and other AI coding tools. Key differentiators include: (1) Context-aware everything - proprietary Riptide reasoning engine that analyzes entire codebases; (2) Agentic IDE with Cascade that thinks multiple steps ahead; (3) Free-forever tier with generous features to drive adoption; (4) Enterprise focus with FedRAMP High and DoD IL6 compliance; (5) Multi-model support (GPT, Claude, Llama); (6) Built on expertise from GPU infrastructure optimization background. Windsurf claims to be 'the world's most advanced AI coding assistant' and emphasizes keeping developers 'in flow' rather than just autocomplete. The company grew from 0 to 1 million users in just 4 months after launching the Windsurf Editor.
Leadership
Founders
Varun Mohan
MIT graduate who previously worked at Nuro as a Tech Lead Manager from January 2018 to May 2021, managing the company's autonomy infrastructure teams. He interned at multiple companies including Quora, LinkedIn, Samsung, and Cloudian during his education.
Douglas Chen
MIT graduate who previously worked as a software engineer at Facebook/Meta, where he helped build tooling for devices like the Oculus Quest VR headset.
Executive Team
Varun Mohan
Co-Founder and CEO (through July 2025)
MIT graduate, former Tech Lead Manager at Nuro managing autonomy infrastructure teams. Joined Google DeepMind in July 2025 as part of acquisition.
Douglas Chen
Co-Founder (through July 2025)
MIT graduate, former software engineer at Facebook/Meta working on Oculus Quest tooling. Joined Google DeepMind in July 2025 as part of acquisition.
Founding Story
Varun Mohan and Douglas Chen, who first met in middle school and later became classmates at MIT, founded Exafunction in June 2021. Before starting Exafunction, they saw first-hand the promise and challenges of deploying deep learning models in the real world. The company initially focused on building serverless infrastructure that abstracts away the challenges of deep learning and GPU virtualization. In 2022, they pivoted from Exafunction to Codeium, transforming the company's focus from GPU management to AI-powered developer tools. In April 2025, they rebranded to Windsurf, reflecting a shift from an autocomplete plugin to a full AI-native IDE.
Business Model
Revenue Model
Subscription-based freemium model with monthly and annual plans. Revenue from Individual (free), Pro, Teams, and Enterprise tiers based on usage credits and feature access. Also offers API-based access and integrations.
Pricing Tiers
Free forever plan with unlimited autocomplete, Chat, and Command. Default and slow speeds. Access to AI models based on compute availability. Limited to 25 prompt credits per month (equivalent to 100 prompts with GPT-4.1 and o4-mini).
500 prompt credits per month. Blazing fast autocomplete speed. Unlimited use of larger models like Claude 3.5 Sonnet, GPT-4o, Llama 3.1 405B for Chat. Uncapped advanced reasoning. No artificial limits on code indexing. Massively expanded use of Riptide reasoning backend. Significantly larger context lengths. Pro-tier badge on public profile. Originally $10/month, increased to $15/month with 2000 steps (500 User Prompt credits and 1500 Flow Action credits). Grandfathered pricing available for early users.
500 prompt credits per user per month. Unlimited access to large models. Advanced and expanded reasoning capabilities. Originally $18-24/user/month with existing customers grandfathered at lower rates.
1,000 prompt credits per user per month. Advanced reasoning about existing codebases. Unlimited access to large models. Custom features, security, and compliance. Government tier available with FedRAMP High and IL5/IL6 compliance.
Target Markets
- Individual developers and software engineers
- Technology startups
- Enterprise software development teams
- Government agencies and defense contractors (DoD, federal agencies)
- Autonomous vehicle companies
- Computer vision and AI/ML development teams
- AI-assisted code generation and completion
- Large-scale codebase transformations and refactoring
- Code review and navigation
- Debugging and error correction
- Learning new programming languages and frameworks
- Government and defense software development (FedRAMP/IL6)
- ServiceNow
- Over 800,000 to 1 million individual developers
- 1,000+ enterprise customers
- Sophisticated autonomous vehicle companies