How Prompt Tuning Improved GPT-5.5 in VS Code

VS Code Update | July 5, 2026, 8 p.m. | Original

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.

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Visual Studio Code 1.128 (Insiders) Visual Studio Code 1.129 (Insiders)