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Improving token efficiency for GitHub Copilot in VS Code

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GitHub Copilot token efficiency improvements are highly relevant to AI-assisted development and developer experience.

Open Source code.visualstudio.com
Improving token efficiency for GitHub Copilot in VS Code
Summary

GitHub Copilot's VS Code agentic harness now uses prompt caching and on-demand tool search to reduce token consumption under usage-based billing. Cached input tokens cost up to 10x less, while deferred tool definitions keep the prompt prefix cache intact. Optimizations for OpenAI models include longer cache retention and WebSocket connections, maintaining task success rates while dropping token usage.

Author

Microsoft