Shane Legg
Co-founder & Chief AGI Scientist, Google DeepMind
50% chance of AGI by 2028
01 / THE ORIGINAL CLAIM
“I think there's a 50% chance that we have AGI by 2028. Now, it's just a 50% chance. I'm sure what's going to happen is we're going to get to 2029 and someone's going to say, “Shane, you were wrong.” Come on, I said 50% chance.”
Shane Legg ·
Deadline given: by 2028 (50% chance)
02 / THE REALITY CHECK
PendingResolves at the end of 2028, and it was a coin-flip forecast. Benchmarks are moving fast, but Legg's own CEO has given a slower timeline, and ARC Prize is 'not claiming' its top-scoring model is AGI.
2.3 years left
03 / FOLLOW THE EVIDENCE
What actually happened.
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01
In 2011 Legg blogged a log-normal forecast for human-level AGI with 'a mean of 2028 and a mode of 2025'. He reaffirmed 50% by 2028 on the Dwarkesh Podcast in October 2023.
dwarkesh.com ↗ -
02
In December 2025 he told Hannah Fry he sees a 50% chance of 'minimal AGI' by 2028, with full AGI following 3–6 years later.
the-decoder.com ↗ -
03
Google DeepMind CEO Demis Hassabis said in March 2025 that AGI capabilities would 'start coming to the fore' 'over the next five to 10 years'.
cnbc.com ↗ -
04
On ARC-AGI-3, which launched in March 2026 with frontier AI at 0.51%, the best September 2026 result is 62.7% (standard harness). ARC Prize says this does not prove AGI.
arcprize.org ↗ -
05
In AI Impacts' 2024 survey, researchers' aggregate forecast gave a 50% chance of human-level machine intelligence by 2042. That is 14 years later than Legg, though the survey series keeps moving earlier.
aiimpacts.org ↗
Where things stand
The deadline is more than two years away, and Legg framed it as a coin flip. He has held the forecast since a 2011 blog post (mean 2028, mode 2025). In December 2025 he narrowed it to 'minimal AGI', meaning AI that can do the cognitive tasks most people typically do, with full AGI 3–6 years later. His own CEO, Demis Hassabis, has given a slower '5 to 10 years' from 2025. Surveyed AI researchers put 50% odds on human-level AI only by 2042.