What I Learned Testing GPT-5.5

What I Learned Testing GPT-5.5

April 24, 2026 · 37 min

About this episode

Nathaniel Whittemore discusses the launch and implications of GPT 5.5, sharing insights from his testing across various applications.

GPT 5.5 is here, and the first reactions are split between benchmark dominance, coding debates, Anthropic comparisons, and questions about whether the upgrade will feel dramatic to everyday users. NLW breaks down the launch, the “real work” positioning, the Mythos backdrop, and what changed in OpenAI’s communication strategy, then shares what he learned testing GPT 5.5 across writing, coding, strategy, design, spreadsheets, and data analysis. AI Practitioner's Credential Survey - ⁠⁠⁠⁠https://tally.so/r/vGOLr4⁠⁠⁠⁠ Brought to you by: KPMG – Agentic AI is powering a potential $3 trillion productivity shift, and KPMG’s new paper, Agentic AI Untangled , gives leaders a clear framework to decide whether to build, buy, or borrow—download it at ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠www.kpmg.us/Navigate⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ Granola - The AI notepad for people in back-to-back meetings. 100% off your first 3 months with code AIDAILY at ⁠⁠⁠⁠⁠⁠⁠⁠http://granola.ai/aidaily⁠⁠⁠⁠⁠⁠⁠⁠ Mercury - Modern banking for business and now personal accounts. Learn more at…

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