Answer · Coding
What AI models does Windsurf use?
Windsurf runs on Cascade (Cognition), Claude (Anthropic), Claude Sonnet 4.5 (Anthropic), Devin (Cognition), Fast (Cognition), Fusion (Cognition), Gemini (Google), GPT (OpenAI), GPT 5.2 Mini (OpenAI), GPT-5.2 (OpenAI), GPT-5.6 (OpenAI), Haiku (Anthropic), Kimi K2.5 (Moonshot AI), OpenAI frontier models (OpenAI), SWE 1.7 (Cognition), SWE-1.5 (Cognition) and Ultra (Cognition).
- Models used
- 17
- Primary model
- Claude Sonnet 4.5
- Public API
- Yes
- Last checked
- 2026-09-12
Model claims are labelled by how we know them: Cascade — unknown, Claude — inferred, Claude Sonnet 4.5 — disclosed, Devin — inferred, Fast — unknown, Fusion — unknown, Gemini — inferred, GPT — inferred, GPT 5.2 Mini — disclosed, GPT-5.2 — disclosed, GPT-5.6 — disclosed, Haiku — disclosed, Kimi K2.5 — disclosed, OpenAI frontier models — inferred, SWE 1.7 — disclosed, SWE-1.5 — disclosed and Ultra — unknown. "Disclosed" means the vendor says so in public; "inferred" means it was derived from documentation, headers or release notes.
Context window: Varies by model.
Other stack signals: vscode-extension.
Cite this answer
Tomorrow. “What AI models does Windsurf use?” Tomorrow AI & Emerging Tech Index, AlienSquad, updated 2026-09-12. https://tomorrow.aliensquad.ai/q/what-models-does-windsurf-use
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