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In Cascade, you can easily switch between different models of your choosing. Under the text input box, you will see a model selection dropdown menu containing the following models:
For the most up-to-date pricing and availability, please refer to the model selector in Cascade within the Windsurf IDE.
Your quota and extra usage is billed based on the token cost of the model you select. You can view the cost of each model in the table below.

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SWE-1.5, swe-grep, SWE-1

Our SWE model family of in-house frontier models are built specifically for software engineering tasks. Our latest frontier model, SWE-1.5, achieves near-SOTA performance in a fraction of the time. Our in house models include:
  • SWE-1.5: Our best agentic coding model we’ve released. Near Claude 4.5-level performance, at 13x the speed. Read our research announcement.
  • SWE-1: Our first agentic coding model. Achieved Claude 3.5-level performance at a fraction of the cost.
  • SWE-1-mini: Powers passive suggestions in Windsurf Tab, optimized for real-time latency.
  • swe-grep: Powers context retrieval and Fast Context

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Bring your own key (BYOK)

This is only available to free and paid individual users.
For certain models, we allow users to bring their own API keys. In the model dropdown menu, individual users will see models labled with BYOK. To input your API key, navigate to this page in the subscription settings and add your key. If you have not configured your API key, it will return an error if you try to use the BYOK model. Currently, we only support BYOK for these models:
  • Claude 4 Sonnet
  • Claude 4 Sonnet (Thinking)
  • Claude 4 Opus
  • Claude 4 Opus (Thinking)