Visual Studio Code | Code Editing. Redefined Follow How Prompt Tuning Improved GPT-5.5 in VS Code See how VS Code and OpenAI tested GPT-5.5 system prompt changes in a two-week experiment, cutting tool calls and tail-end token usage while speeding up edits. https://code.visualstudio.com/blogs/2026/07/06/optimizing-vscode-coding-harness-model-providers code.visualstudio.com
