All harnesses
Windsurf Cascade
Codeium
Windsurf is Codeium's standalone IDE, with Cascade as its multi-step agent loop. Codeium also trains an in-house SWE-1 model family that the IDE can route to as a cheaper alternative to frontier APIs, which is unusual among IDE harnesses and a real differentiator on price.
Type
ide
License
Proprietary
Model story
Multi-model, in-house option
Vendor
Codeium
Leaderboard Placements
| Benchmark | Best base model | Score | Rank |
|---|---|---|---|
| SWE-bench Verified | GPT-5.5 | 64.1 | #10 / 15 |
| Terminal-Bench | GPT-5.5 | 37.8 | #7 / 13 |
| Aider Polyglot | — | — | — |
| SWE-Lancer | — | — | — |
Distribution
Standalone IDE for macOS, Windows, and Linux.
Model Story
Multi-model. Claude, GPT, Gemini, plus Codeium's own SWE-1 family. Per-task routing.
Pricing
Per-seat subscription with included credits.
Who It's For
Teams that want a Cursor-style IDE but with a hosted in-house model option for cost-sensitive workloads.
Notable Features
- Cascade multi-step planning loop
- In-house SWE-1 model family
- Flow-state UX (live agent edits beside you)
- Per-task routing between frontier and house models
- Indexed repo retrieval
Vendor site for Windsurf Cascade:https://codeium.com/windsurf