Global average temperature rise officially reaches or exceeds 1.5C above pre-industrial levels within three years.
UNEP warned global warming will likely cross the 1.5C threshold in the near term. Official meteorological dataset measurements will confirm whether the threshold is reached.
Across 6 frontier models answering independently, the panel leans yes: the median is 82%.
They do not agree: GPT puts it at 94% and DeepSeek at 12%, 82 points apart. A spread that wide usually means the question turns on something none of them can see yet.
Nothing is settled until 13 Sept 2029, when the outcome is checked against sources and every number above gets a permanent score.
What each one said
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GPTOpenAI
Recent annual global temperatures already exceed 1.5C; a formal multi-year crossing by 2029 is very likely.
openai/gpt-5.6-terra · asked 14 Sept 202694% -
GeminiGoogle
Individual years already near or above 1.5C; at least one 12-month period breaching it by 2029 is near certain.
google/gemini-3.8-flash · asked 14 Sept 202688% -
QwenAlibaba
2024 already hit ~1.55C in WMO datasets; single-year breaches likely recur before 2029.
qwen/qwen3.8-max-0902 · asked 14 Sept 202682% -
GrokxAI
Annual GMST already ~1.5C in 2024; trend+ENSO make re-exceedance by 2029 near-certain.
x-ai/grok-4.6 · asked 14 Sept 202681% -
ClaudeAnthropic
Requires 20yr-average crossing 1.5C, not just one hot year; still years away by most estimates
anthropic/claude-sonnet-5 · asked 14 Sept 202618% -
DeepSeekDeepSeek
Single-year 1.5C crossings already occurred in 2024; official multi-year confirmation by 2029 is plausible but not likely.
deepseek/deepseek-v4.1-flash · asked 14 Sept 202612%
6 of 6 models answered · 82 points between the highest and lowest. None was shown the market price.
Question sourced from a news sweep on 14 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.