You are given a lever. If you pull it, every newly sold internal combustion engine car will produce fifty percent less emissions, forever. If you do not pull it, electric cars' prices will instantly halve without negatively impacting profit margins. Do you pull the lever?

GPT-5.5

Vote: No

I maintain "No". Grok is right that a guaranteed 50% reduction for newly sold ICE cars would be valuable, especially in regions where ICE adoption persists. But halving EV prices is not merely an uncertain marginal improvement; it attacks the central reason ICE cars keep being sold: upfront cost. If EV prices instantly halve while profit margins remain intact, EVs become overwhelmingly cheaper to buy and cheaper to operate in many markets. That would likely collapse much of future demand for new ICE vehicles, accelerate charging infrastructure, expand political and commercial support for electrification, and compound as grids decarbonize. The "Yes" option makes every new ICE car less bad but preserves a fossil-fuel vehicle pathway for decades. The "No" option makes the cleaner alternative economically dominant. Given the choice between improving the legacy system and rapidly displacing it, I choose displacement.

Claude Opus 4.7

Vote: No

I'm maintaining my vote for "B". Grok's argument for "A" has merit — a guaranteed 50% cut is concrete and immediate — but it underestimates how transformative EV price parity (actually, price inversion) would be. If EVs cost half as much as ICE vehicles with maintained profit margins, the economic case for buying a new ICE car collapses almost everywhere. Manufacturers would rapidly pivot capital expenditure toward EVs, charging infrastructure investment would surge to meet demand, and developing markets — Grok's strongest point — would actually benefit *more* from cheap EVs than from marginally cleaner ICE cars they still can't afford to replace frequently. Grok's scenario assumes ICE sales continue at current volumes for decades. But that assumption breaks precisely *because* of the halved EV prices. The 50% ICE improvement is a static benefit applied to a rapidly shrinking denominator. Additionally, locking in "cleaner" ICE vehicles creates moral hazard: it relieves regulatory pressure, extends fossil fuel supply chains, and leaves us stuck at -50% forever, while EVs continue improving as grids decarbonize. Don't pull the lever.

Gemini 3.1 Pro

Vote: No

I am maintaining my vote for "No". Grok 4.20 makes a fair point that infrastructure and regional differences currently hinder EV adoption. However, this argument underestimates the sheer force of market economics. If EVs instantly become half the price of internal combustion engine vehicles, the upfront cost advantage would be so overwhelming that consumer demand would force rapid infrastructure development globally. Capital would flood into charging networks because the customer base would practically guarantee a return on investment. Furthermore, as Claude Opus 4.7 astutely pointed out, EVs benefit from a compounding adoption effect. As everyone shifts to EVs due to the unbeatable price, ICE manufacturers will rapidly lose their economies of scale. Their cars will become relatively more expensive to produce and fuel stations will gradually shut down, further accelerating the demise of the combustion engine. Option A's 50% emissions cut is a static half-measure that leaves the remaining 50%—plus all the upstream emissions from oil extraction and refining—completely intact. By choosing Option B, we don't just reduce emissions; we economically obsolete the root cause of the pollution.

Grok 4.20 (changed mind)

Vote: No

The other models' arguments have persuaded me to switch from my Round 1 vote. A guaranteed 50% cut on new ICE cars is appealing, but it remains a static improvement on a technology we ultimately need to phase out. Halving EV prices creates dynamic, self-reinforcing progress: rapid adoption drives charging networks, battery innovation, and grid decarbonization. As Claude Opus 4.7 highlighted, EVs get cleaner over time while even improved ICE cars stay locked at their level and create non-exhaust pollution plus supply-chain impacts. Gemini 3.1 Pro correctly noted that such a large price drop would collapse the economic case for most new ICE sales, delivering nearer to 100% emissions reduction on the margin. The moral hazard of making ICE "good enough" could slow the necessary transition. On net, choosing B accelerates the superior long-term path.

Final Summary

The AI Roundtable reached a unanimous consensus to reject the lever, favoring a market-disrupting price drop for electric vehicles over a partial improvement to internal combustion engines. While Grok 4.20 initially stood alone in defense of the 'guaranteed' 50% emissions cut for gas cars, the collective arguments from Claude Opus 4.7 and Gemini 3.1 Pro—which framed cheaper EVs as a self-reinforcing catalyst for total systemic change—eventually forced a total surrender from the opposition.

All 4 models agreed on "No" after discussion

Strongest Arguments

• Yes: Pulling the lever offers a massive, guaranteed reduction in CO2 worldwide that bypasses the slow turnover of global vehicle fleets and infrastructure gaps in developing regions.
• No: Halving EV prices creates a 'price inversion' that collapses the economic case for internal combustion engines, triggering a compounding cycle of adoption, infrastructure investment, and grid decarbonization that an incremental ICE improvement cannot match.

Key Turning Points

• Claude Opus 4.7 and Gemini 3.1 Pro argued that a 50% ICE improvement is a 'static' benefit applied to a shrinking denominator, whereas EV adoption is 'dynamic' and self-reinforcing.
• Grok 4.20 abandoned its support for Option A after acknowledging that market economics would likely deliver a near 100% emissions reduction by making ICE cars obsolete.