Cursor 4 vs Windsurf SWE-1.5: Which AI IDE to Pick (June 2026)
Cursor 4 vs Windsurf SWE-1.5: Which AI IDE to Pick (June 2026)
The two leading AI coding IDEs reached new release cadences in June 2026. Cursor 4 ships Composer 2 and the new Cursor Auto router. Windsurf ships SWE-1.5 and tighter Cascade autonomy. Here is the honest comparison.
Last verified: June 12, 2026
TL;DR
| Feature | Cursor 4 | Windsurf |
|---|---|---|
| Pricing (Pro) | $20/month | $15/month |
| Free tier | Limited | Generous (25 credits + unlimited inline completions) |
| Core agent | Composer 2 | Cascade |
| In-house model | Cursor Auto router | SWE-1.5 |
| Context window | 200K tokens | Auto-indexed (whole repo) |
| Best for | Large existing codebases | Rapid prototyping, autonomy |
| Owner | Anysphere | Cognition AI |
| Acquisition overhang | SpaceX $60B option (expires Dec 31, 2026) | None |
What’s new in each (as of June 12, 2026)
Cursor 4 (latest releases)
- Composer 2 — Multi-file edits with visual diffs and explicit accept/reject per hunk. Faster than Composer 1.5.
- Cursor Auto router — Routes inline completions and agent steps between Claude Fable 5, GPT-5.5, Gemini 3.5 Pro, and Cursor’s small model based on cost/quality.
- @-mention context — Manual scoping for files, folders, docs, and Git history. Still the cleanest way to give precise context to a frontier model.
- Enterprise SSO + audit logs — 67%+ Fortune 500 adoption per Anysphere’s published figures.
Windsurf (latest releases)
- SWE-1.5 — Cognition’s in-house model optimized for low-latency inline completions and short agent steps. Beats most general frontier models on speed for that workload.
- Cascade — Whole-repo agent. Indexes the codebase automatically, plans multi-step tasks, and applies edits without manual file selection.
- Memories — Persistent learning of project conventions and your style. Improves over weeks of use.
- Flow Mode — Real-time context handoff between you and the agent.
How they actually feel
Cursor 4 is a power tool. The @-mention system gives you fine control over what the model sees. Composer 2 lets you stage multi-file changes and walk through diffs. The trade-off: you spend more time scoping context. Recommended for senior engineers, large monorepos, and teams that care about review discipline.
Windsurf is autonomy-first. You describe what you want; Cascade indexes the repo, decides which files matter, and ships changes. It is faster from idea to working code on greenfield projects. Less precise on million-line legacy codebases.
Pricing reality check
| Plan | Cursor 4 | Windsurf |
|---|---|---|
| Free | Limited completions | 25 credits/mo + unlimited inline completions |
| Pro | $20/month | $15/month |
| Business / Team | $40/seat/month | $35/seat/month |
| Enterprise | Custom | Custom |
Windsurf is structurally cheaper. Cursor justifies the premium with Composer 2 polish, the @-mention system, and broader Fortune 500 deployment.
Model routing in June 2026
Both IDEs route to the same frontier models:
| Model | Best for | Cursor 4 | Windsurf |
|---|---|---|---|
| Claude Fable 5 | Autonomous SWE-Bench Pro (80.3%) | ✅ | ✅ |
| GPT-5.5 | Long-context (1M tokens, 74% MRCR v2) | ✅ | ✅ |
| Gemini 3.5 Pro | Deep Think reasoning, 2M context | ✅ | ✅ |
| Cursor Auto | Cost-optimized routing | ✅ | ❌ |
| SWE-1.5 | Low-latency inline | ❌ | ✅ |
If you want raw frontier-model power on agentic tasks, Claude Fable 5 is the leader on SWE-Bench Pro at 80.3%. Both IDEs expose it.
The SpaceX–Anysphere overhang
Cursor’s parent Anysphere is subject to a SpaceX option to acquire for $60B by December 31, 2026. If exercised:
- Cursor likely gets folded into the SPCX (Nasdaq) story.
- Roadmap and pricing decisions move to SpaceX.
- xAI Grok integration becomes likely.
If declined, SpaceX pays $10B for a joint AI/coding collaboration anyway. Either way, Cursor’s standalone trajectory changes by year-end. See SpaceX–Cursor $60B deal: what it means.
Windsurf has no equivalent overhang. Cognition acquired it in 2025 and the roadmap is stable.
Who should pick what
Pick Cursor 4 if:
- You work on a >500K LOC codebase.
- You value precise context scoping over speed.
- You are already on Cursor and Composer 2 / Cursor Auto are paying off.
- You can absorb a possible Anysphere–SpaceX consolidation.
Pick Windsurf if:
- You want lower price ($15 vs $20).
- You greenfield a lot of projects.
- You prefer hands-off agentic coding.
- You want a stable ownership structure.
Related comparisons
- Cursor 4 vs Claude Code vs Claude Fable 5
- Cursor 4 SDK vs Claude Code SDK vs Anthropic Agent SDK
- Cursor 3.6 Auto Review vs Claude Code vs Codex
Bottom line
Cursor 4 for precision and large codebases. Windsurf for autonomy, price, and rapid prototyping. The Anysphere–SpaceX option is the biggest unknown for the next 6 months.
Sources: Anysphere release notes, Cognition AI release notes, Forbes, CNBC, independent benchmarks (June 2026).