Exafunction, Inc.

Mountain View, CaliforniaFounded 2021

2Tools Listed

46Combined Tool Views

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.

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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.

Discussions

Create a new discussion about Exafunction, Inc.

Lindsay Seifi

6 months ago

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?

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.

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

Individual (Free)

$0/month

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).

Pro

$15/month (or annual billing)

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.

Teams

$30/user/month (or $228/user/year annual)

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.

Enterprise

Starting at $60/user/month

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.

Not applicable. Company was acquired in July 2025 in a dual transaction: Google DeepMind acquired talent and IP for $2.4 billion, while Cognition AI acquired the Windsurf product, IP, brand, and customer base.