Simon Willison tests Python 3.15's new profiler via a Codex agent, producing flame graphs and heatmaps
Simon Willison · rss · 2026-10-13
Simon Willison put Python 3.15's new profiler through its paces by delegating the task to a GPT-6 Astra Extra High agent in Codex. He issued a single prompt asking the agent to first research the web-edit app from PyPI, then generate a flame graph and source heatmap demo for it.
The result demonstrates an agent workflow that combines research and profiling visualization in one step, with example flame graph and heatmap outputs shown in the post.
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