EF English Proficiency Index 2025
An AI-generated podcast episode based on the Deep Research report:
From a critical analysis of the Deep Research report (by GPT 5.1 Thinking):
The report repeatedly treats EF EPI as a near-authoritative “diagnostic of the world’s communicative competence” and leans toward reading it as a proxy for the true English level of whole national populations.
That is a big stretch.
EF itself is explicit that the data is self-selected, internet-connected, and biased toward more educated young adults, and that this can push scores both upwards (excluding poorer, less connected people) and asymmetrically between countries.
Academic and critical commentary has hammered this point for years: the EPI “suffers from self-selection bias” and should not be treated as a representative sample of national populations.
An AI-generated podcast episode based on GPT 5.1 Thinking’s critique of the Gemini Deep Research report:
