What Is Windsurf? Codeium's AI-Native Code Editor Explained
Windsurf is an AI-native code editor from Codeium. Here's what it is, how it compares to Cursor, and what developers are saying about it.
An AI-Native Editor Built Around Agentic Coding
Windsurf is a code editor built by Codeium that’s designed from the ground up for AI-assisted development. Unlike traditional editors with AI features bolted on, Windsurf treats the AI as a first-class collaborator — one that can read your codebase, execute multi-step tasks, and work across files without you directing every move.
The editor launched in late 2024 and quickly attracted attention as a direct competitor to Cursor. It runs on a VS Code foundation, so the interface feels familiar, but the underlying approach to AI integration is different enough to matter.
If you’ve been hearing about Windsurf and want to understand what it actually does, how it compares to other AI coding tools, and whether it’s worth switching to, this guide covers all of it.
What Codeium Built and Why It Matters
Codeium started as an AI code completion company. Before Windsurf, the company’s main product was an IDE plugin — similar to GitHub Copilot — that provided inline suggestions across VS Code, JetBrains, Vim, and other editors. It built a solid reputation for fast, accurate completions, and it offered a generous free tier that helped it grow quickly.
Windsurf represents a bigger bet. Rather than staying in the plugin business, Codeium decided to build an entire editor around AI-native workflows. The thesis: code completion is only the beginning of what AI can do in a development environment, and an editor designed around that assumption would outperform an editor where AI is an add-on.
In May 2025, OpenAI announced it would acquire Codeium — and with it, Windsurf — for approximately $3 billion. The acquisition signaled that OpenAI saw Windsurf as a serious competitive asset in the growing market for AI developer tools, particularly as an alternative to Microsoft’s GitHub Copilot and Anthropic’s Claude Code.
How Windsurf Actually Works
The Cascade Agent
The centerpiece of Windsurf is a feature called Cascade. It’s the agentic AI system that runs inside the editor and can take sequences of actions on your behalf.
Cascade isn’t just a chat window. It has awareness of your entire codebase — not just the file you have open. You can ask it to add a feature, fix a bug across multiple files, refactor a module, or write tests, and it will read the relevant files, make the changes, and explain what it did. It can also run terminal commands, execute code, and check output.
This multi-step, context-aware behavior is what separates Windsurf from simpler AI coding tools. It’s less about getting a suggestion and more about delegating a task.
Flows: Combining Copilot and Agent Modes
Windsurf uses a concept called “Flows” to describe how the AI operates. The idea is that the AI moves fluidly between acting as a copilot (making suggestions as you type) and acting as an agent (taking autonomous actions on your behalf) without you needing to switch modes manually.
In practice, this means you can be writing code and get inline completions, then shift to giving Cascade a multi-step task, and then return to manual editing — all within the same interface and conversation context.
The context continuity matters. One of the persistent problems with AI coding tools is context rot — the degradation of understanding that happens as long conversations accumulate and the AI loses track of earlier decisions. Windsurf’s architecture tries to mitigate this by maintaining codebase-level awareness rather than relying solely on the conversation window.
Model Support
Windsurf is model-agnostic. It supports Claude (Anthropic), GPT-4 and GPT-4o (OpenAI), and Codeium’s own internally-trained models. The availability of specific models depends on your plan tier.
Users can switch between models depending on the task. Some prefer Claude for complex reasoning and refactoring. Others use GPT-4o for speed. Codeium’s own models are optimized for code completion specifically.
Key Features at a Glance
- Cascade agent — multi-step task execution with full codebase context
- Inline completions — fast, context-aware suggestions as you type
- Multi-file editing — changes across files in a single Cascade session
- Terminal integration — the agent can run commands and read output
- Model flexibility — Claude, GPT-4, and Codeium’s own models
- VS Code compatibility — familiar interface, extensions largely carry over
- Live preview — see changes as they’re applied
- Built-in diff view — review everything Cascade touches before accepting
Windsurf vs Cursor: The Comparison Everyone Asks About
Cursor and Windsurf are the two names that come up most often in the AI code editor conversation. They share more similarities than differences on the surface — both are VS Code forks, both have agentic AI, both let you work across files. But there are real distinctions.
For a detailed breakdown, see Cursor vs Windsurf: Which AI Code Editor Should You Use?. The short version:
Where Windsurf stands out:
- Cascade’s codebase-level context tends to feel more coherent on longer tasks
- The Flows model blends copilot and agent behavior more fluidly
- The free tier has historically been more generous
- Some developers find it better at staying on task without going off-script
Where Cursor stands out:
- Larger ecosystem and more community resources at launch
- More granular control over how the agent operates
- Cursor’s Tab feature (multi-line completion) is particularly well-regarded
- More established integrations and extensions
Neither tool is strictly better. It depends on your workflow, the kinds of projects you work on, and which model you prefer to drive the agent.
If you want to go deeper on the three-way comparison, Windsurf vs Cursor vs Claude Code breaks down all three options against each other.
Windsurf vs GitHub Copilot
GitHub Copilot is the incumbent. It’s deeply integrated into VS Code, has a massive user base, and benefits from GitHub’s access to a huge corpus of public code for training.
But Copilot started as an inline completion tool, and it shows. The agentic features added to Copilot over time feel like additions rather than the core design. Windsurf’s agent mode was built from the start as the main event.
If your current workflow is VS Code + Copilot and you’re satisfied with completions but frustrated by the limits of what Copilot can do when you want it to actually handle a task end-to-end, Windsurf is worth trying. See Windsurf vs GitHub Copilot: AI Code Editors Head to Head for a full comparison.
Windsurf Pricing
Windsurf has a free tier, which is one reason it attracted users quickly. The free plan includes a limited number of Cascade “flow actions” per month and access to Codeium’s own models.
Paid plans (as of 2025) include:
| Plan | Price | What You Get |
|---|---|---|
| Free | $0/mo | Limited flow actions, basic completions |
| Pro | ~$15/mo | More flow actions, Claude and GPT-4 access |
| Pro Ultimate | ~$60/mo | High usage limits, priority access |
| Teams | Custom | Shared billing, admin controls |
Exact limits and pricing have shifted across updates — always check the Windsurf site directly for current numbers. But the structure has stayed roughly consistent: a functional free tier to get started, and paid tiers that unlock more model options and higher usage.
What Developers Are Actually Saying
Reception to Windsurf has been largely positive, particularly among developers who had grown frustrated with Cursor’s more complex configuration or the cost of Copilot at scale.
Common praise:
- Cascade feels more “in flow” than other agentic tools — it doesn’t constantly ask for confirmation on things that should be obvious
- The codebase context is more reliable for longer sessions
- The free tier is genuinely useful, not just a demo
- Switching between inline suggestions and agent mode is natural
Common criticisms:
- Some users report Cascade being overly confident — making changes it shouldn’t without enough hesitation
- Model availability can vary by region and plan
- Fewer community tutorials and resources than Cursor, at least initially
- Some VS Code extensions don’t fully carry over
The OpenAI acquisition in 2025 raised questions about the product’s direction — whether Windsurf would remain a neutral multi-model tool or shift toward favoring OpenAI models. As of early 2026, the multi-model stance has remained in place, but it’s worth watching.
Where Windsurf Fits in the Broader AI Dev Tool Landscape
Windsurf sits in the middle of a spectrum of AI development tools that ranges from code suggestion plugins all the way to full app-building environments.
On one end, you have tools like GitHub Copilot and inline completions — they assist but don’t act. On the other end, you have browser-based app builders like Replit Agent, Bolt, and Lovable that generate entire applications from prompts. Windsurf lives in the professional developer tier: it assumes you know what you’re doing, you have an existing codebase, and you want AI to help you move faster — not build for you from scratch.
This is different from what’s happening at the frontier of full-stack AI app builders, where the tools are aimed at people who may not write much code at all. Windsurf is squarely for developers who write code every day and want an AI that can keep up.
The question of what AI coding agents actually replace is worth thinking through. Tools like Windsurf don’t replace engineers — they change what engineers spend time on. Boilerplate, repetitive refactoring, and test generation get handed off. The harder design and architectural decisions stay with the human.
Beyond the Editor: Where Remy Takes a Different Approach
Windsurf is excellent at what it does: it makes working in an existing codebase faster and more capable. But it’s still a code-level tool. You start with code, you work in code, and the output is code.
Remy works at a different level of abstraction. Instead of editing TypeScript in an AI-assisted editor, you write a spec — a structured markdown document that describes what your application does. Remy compiles that spec into a full-stack app: real backend, SQL database, auth, deployment.
The spec is the source of truth. The code is derived output. If the generated code has problems, you fix the spec and recompile rather than hunting through files. As AI models improve, the compiled output improves automatically without rewriting anything.
This isn’t a replacement for Windsurf — they serve different use cases. If you’re maintaining a large production codebase, Windsurf’s agentic editing is the right tool. If you’re starting a new application and want a full-stack result from a structured description rather than writing infrastructure from scratch, Remy is worth exploring.
You can try Remy at mindstudio.ai/remy.
Frequently Asked Questions
What is Windsurf and who made it?
Windsurf is an AI-native code editor built by Codeium. It launched in late 2024 as a standalone editor — not just a plugin — with an agentic AI called Cascade at its core. Codeium was acquired by OpenAI in 2025 for approximately $3 billion.
Is Windsurf free to use?
Yes, Windsurf has a free plan that includes limited Cascade flow actions and access to Codeium’s own AI models. Paid plans starting around $15/month unlock Claude and GPT-4 access and higher usage limits.
How is Windsurf different from Cursor?
Both are VS Code-based editors with agentic AI. Windsurf’s differentiator is Cascade’s codebase-level awareness and the Flows model that blends copilot and agent behavior. Cursor has a larger community and more granular control options. The full comparison covers both in detail.
What is Cascade in Windsurf?
Cascade is Windsurf’s agentic AI system. Unlike a simple chat window, Cascade can read your full codebase, make changes across multiple files, run terminal commands, and execute multi-step tasks without you directing every action. It maintains context across a session rather than treating each prompt in isolation.
Is Windsurf good for beginners?
It’s more geared toward developers who already write code and want AI to accelerate their workflow. If you’re new to coding and want AI to build apps for you, tools like Replit Agent or Lovable are more beginner-friendly. Windsurf assumes familiarity with a codebase.
Does the OpenAI acquisition change anything for Windsurf users?
So far, Windsurf has maintained its multi-model approach post-acquisition. Users can still access Claude, GPT-4, and Codeium’s own models. Whether that changes longer-term remains to be seen, but as of early 2026, the product is largely operating as it did before.
Key Takeaways
- Windsurf is an AI-native code editor from Codeium (now part of OpenAI) that centers on an agentic AI called Cascade.
- Cascade works across your entire codebase — not just the open file — and can execute multi-step tasks including running terminal commands.
- The Flows model blends inline completions and agent behavior in a single continuous experience.
- Windsurf competes directly with Cursor and has a more generous free tier; the right choice depends on your workflow.
- It’s a professional developer tool — designed for people who already code and want AI to accelerate their work, not a no-code app builder.
- For a different level of abstraction — starting from a spec rather than a codebase — Remy takes a complementary approach worth understanding.
