When editing code, Chat and Edit model output often doesn’t clearly align with existing code. A model with the apply role is used to generate a more precise diff to apply changes to a file. We recommend Morph Fast Apply or Relace’s Instant Apply model for the fastest Apply experience. You can sign up for Morph’s free tier here or get a Relace API key here. However, most Chat models can also be used for applying code changes. We recommend smaller/cheaper models for the task, such as Claude 3.5 Haiku.
Explore all apply models in the Hub

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Prompt templating

You can customize the prompt template used for applying code changes by setting the promptTemplates.apply property in your model configuration. Continue uses Handlebars syntax for templating. Available variables for the apply template:
  • {{{original_code}}} - The original code before changes
  • {{{new_code}}} - The new code after changes
Example: 
models:
  - name: My Custom Apply Template
    provider: anthropic
    model: claude-3-5-sonnet-latest
    promptTemplates:
      apply: |
        Original: {{{original_code}}}
        New: {{{new_code}}}

        Please generate the final code without any markers or explanations.