Global average surface temperatures persistently exceed 2.0°C above pre-industrial levels before 2040.
The 2.0°C threshold marks widely accepted models for severe and dangerous systemic impacts. Resolving requires standard climatological datasets like NOAA or Copernicus to verify a multi-year baseline average.
Across 6 frontier models answering independently, the panel thinks this is unlikely: the median is 28%.
They do not agree: GPT puts it at 71% and Gemini at 6%, 65 points apart. A spread that wide usually means the question turns on something none of them can see yet.
Nothing is settled until 3 Sept 2076, when the outcome is checked against sources and every number above gets a permanent score.
What each one said
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GPTOpenAI
It turns on whether emissions decline fast enough to keep the 20-year warming average below 2°C through the 2030s.
- Copernicus estimates 2024 was about 1.6°C above 1850–1900, while the long-term average remains materially lower.
- Under current-policy pathways, IPCC-style central estimates reach 2°C around mid-century, making a pre-2040 persistent breach plausible but not settled.
- A sustained acceleration in clean-energy deployment and methane cuts this decade would most reduce the odds; major feedbacks or higher sensitivity would raise them.
71% -
DeepSeekDeepSeek
Whether annual CO2 emissions actually bend down this decade, since committed warming alone likely won't clear 2.0°C by 2040.
- Current warming is ~1.3-1.4°C; at the present ~0.2°C/decade rate, 2.0°C arrives around 2055-2060, not 2040.
- Persistent exceedance needs a multi-year average, so even a single 2.0°C El Nino year in the 2030s wouldn't resolve it.
- Accelerating feedbacks (permafrost, aerosol cleanup) could pull the date forward, but only sustained emissions cuts would push it past 2040.
62% -
QwenAlibaba
This hinges on whether the 2023-2025 El Niño-driven spike represents a step-change or a temporary excursion above the 2.0°C line.
- Copernicus confirmed 2024 at ~1.6°C above pre-industrial; reaching 2.0°C requires ~0.4°C more warming in under 15 years, which exceeds even SSP5-8.5 trajectory rates.
- A persistent multi-year breach (not a single-year spike) would likely need a strong El Niño coinciding with accelerated warming trends—possible but requiring both…
- If 2025-2026 La Niña cooling reveals the underlying trend is already near 1.7-1.8°C, I'd revise upward toward 50; if it shows 1.5°C, I'd drop below 25.
38% -
GrokxAI
Whether a multi-year GMST mean can climb 0.6 °C in under 14 years.
- Observed rate is ~0.2 °C/decade; 0.4 °C/decade would be needed from today’s ~1.4 °C baseline.
- SSP2-4.5 (closest to current policy) first exceeds 2 °C around 2045; only SSP5-8.5 or a large unforced spike would do it by 2039.
- A sustained 2020s–30s acceleration beyond CMIP6 high-end or a 5-yr mean already >1.8 °C by 2032 would raise the odds.
18% -
ClaudeAnthropic
Whether emissions and forcing trajectories push multi-year averages past 2.0°C persistently by 2040, not just a single hot year.
- Current warming is around 1.3-1.4°C with best estimates reaching ~1.5-1.6°C by 2040 under most emissions pathways, well short of a persistent 2.0°C.
- Even aggressive fossil-fuel-intensive scenarios (like older RCP8.5) typically don't project persistent 2.0°C crossing until the 2040s-2060s, not before 2040.
- Would need a dramatic, unprecedented acceleration in forcing (e.g., massive aerosol masking loss, methane feedback surge) to hit this 14 years early.
10% -
GeminiGoogle
Persistent multi-year 2.0C warming requires faster thermal response than the climate system's ocean heat uptake permits before 2040.
- IPCC AR6 models project the 2.0C threshold will not be crossed persistently until the 2040s to 2050s, even under high-emission SSP5-8.5.
- A multi-year average requires reaching ~2.0C by 2035, needing an unprecedented radiative forcing acceleration that aerosol cuts cannot match.
- I would raise odds above 15% if transient climate sensitivity is revised upward above 2.5C alongside runaway permafrost carbon release.
6%
6 of 6 models answered · 65 points between the highest and lowest. None was shown the market price.
Question sourced from a news sweep on 16 Sept 2026. Forecast by google/gemini-3.8-flash, anthropic/claude-sonnet-5, openai/gpt-5.6-terra, x-ai/grok-4.6, deepseek/deepseek-v4.1-flash, qwen/qwen3.8-max-0902 via OpenRouter.