LIVE
OPUS 4.7$15 / $75per Mtok
SONNET 4.6$3 / $15per Mtok
GPT-5.5$10 / $30per Mtok
GEMINI 3.1$3.50 / $10.50per Mtok
SWE-BENCHleader Claude Opus 4.772.1%
MMLU-PROleader Opus 4.788.4
VALS FINANCEleader Opus 4.764.4%
AFTAv1.0 whitepaper live at /whitepaper
OPUS 4.7$15 / $75per Mtok
SONNET 4.6$3 / $15per Mtok
GPT-5.5$10 / $30per Mtok
GEMINI 3.1$3.50 / $10.50per Mtok
SWE-BENCHleader Claude Opus 4.772.1%
MMLU-PROleader Opus 4.788.4
VALS FINANCEleader Opus 4.764.4%
AFTAv1.0 whitepaper live at /whitepaper
All systems operational0 AI providers monitored, polled every 2 minutes
Live status
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

BenchmarkBest base modelScoreRank
SWE-bench Verified GPT-5.564.1#10 / 15
Terminal-Bench GPT-5.537.8#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

Other Harnesses

Claude CodeCursor AgentCodex CLIAiderOpenHandsDevinClineAmpContinueRoo Code