A nuclear fusion experiment achieves a net energy gain factor Q greater than 5 before 2030.

Question

Six frontier AI models put this at 17% by 4 Nov 2031. Full reasoning from every model.

WillHappen.ai · Accepted Answer

17% — the median of 6 frontier models, resolving by 2031-11-04.

Answer

Gemini (Google): 8% — Achieving Q > 5 requires major facilities like ITER or SPARC to operate at full DT spec, which delays make impossible before 2030. ITER's updated baseline delays first plasma to late 2034, completely taking the primary Q>10 candidate out of the running. CFS SPARC targeting Q>10 faces supply chain and magnet commissioning bottlenecks, pushing full-power DT campaigns past 2030. NIF target gain reached ~2.5, but scaling past 5 requires driver energy upgrades or target physics redesigns not funded this decade.

Answer

Claude (Anthropic): 6% — Needs a qualitatively bigger shot than NIF's ~1.5 target-gain record or ITER plasma results, in under 5 years. NIF's best verified result is roughly Q~1.5 (target gain), far short of Q>5, and no funded upgrade path targets that soon. ITER's first significant fusion power runs aren't scheduled until the early-to-mid 2030s, after this resolution date. Private fusion firms (Commonwealth, Helion, TAE) claim 2030s timelines for net-gain demos, not independently verified Q>5 results.

Answer

GPT (OpenAI): 78% — NIF has already demonstrated target gain above 5, so the key uncertainty is whether an independent body accepts the metric. NIF reported target gains above 5 in 2022–24, but those exclude the laser system’s wall-plug energy and invite metric disputes. A recognized facility must publish reproducible diagnostics and an outside verifier must accept its Q definition before 2030. The main downside is a resolution standard requiring whole-facility net electricity; no fusion plant is likely to clear that threshold this decade.

Answer

Grok (xAI): 22% — NIF or SPARC must deliver Q>5 shots in the remaining ~3 years. NIF peak Q remains ~2.4; 10 MJ yield from 2 MJ lasers has no funded 2029 campaign. SPARC first plasma 2026-27, design Q~11, but new tokamaks historically need multi-year commissioning before high-Q. JET 0.67 (1997) to NIF 1.5 (2022) shows slow Q growth; ITER slips past 2030, so case sits below base rate.

Answer

DeepSeek (DeepSeek): 12% — Whether NIF or a private inertial-fusion firm can scale from Q≈1.5 to Q>5 within four years. NIF's 2022 shot reached Q=1.5; scaling to Q>5 requires roughly 3-4x more laser energy or a much better hohlraum, and NIF is capped near 2.2 MJ. ITER's first DT campaign is scheduled for 2035, so the only credible path by 2030 is NIF or a private device like Helion/TAE, none of which has shown Q>1. The one development that would change my mind is a peer-reviewed Q>2 result from a private inertial-fusion firm before 2028, which would make Q>5 by 2030 plausible.

Answer

Qwen (Alibaba): 29% — NIF is the only credible path to Q>5 by 2030; the question is whether target physics scales fast enough from ~Q3. NIF went from Q≈1.5 (Dec 2022) to ~Q2–3 by 2024–25; reaching Q>5 requires another ~2× gain in roughly 4 years, which is plausible but not assured given diminishing… ITER's first D-T plasma is now projected no earlier than 2033–35, and no magnetic-confinement device (SPARC, JET, JT-60SA) is on a credible path to Q>5 before 2030, so… The main risk is that new hydrodynamic instabilities or laser-plasma interactions at higher compression create a wall that incremental target redesigns can't overcome on…

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