Governments agree on the AR7 publication schedule at the next IPCC meeting.

Question

Six frontier AI models put this at 49% by 27 Oct 2027. Full reasoning from every model.

WillHappen.ai · Accepted Answer

49% — the median of 6 frontier models, resolving by 2027-10-27.

Answer

Gemini (Google): 73% — Growing deadline pressure ahead of the second Global Stocktake makes further timeline obstruction diplomatically untenable. Developing nations and fossil fuel producers stalled previous sessions, but delaying past 2027 breaks the AR7 delivery cycle entirely. The IPCC Bureau faces mounting scientific pressure to finalize working group slots before authors can be formally scoped. A continued block by Saudi Arabia or like-minded delegations over GST alignment remains the sole barrier to consensus.

Answer

Claude (Anthropic): 35% — Hinges on whether IPCC Plenary 66/67 resolves the US funding/scope dispute that blocked agreement at IPCC-65. IPCC-65 failed partly due to US delegation disputes and budget uncertainty that likely persist into 2026-2027 sessions. Base rate for resolving deadlocked multilateral scheduling disputes within one meeting cycle is moderate, often taking 2-3 sessions historically. A change in US engagement or a compromise proposal from Bureau members before the next Plenary would most raise this probability.

Answer

GPT (OpenAI): 63% — This hinges on whether a compromise can bridge disputes over AR7 timing and workload before IPCC-66's decision window closes. The 195 IPCC member governments must reach consensus, likely at IPCC-66 in 2027, after AR7 scoping and calendar options are refined. A one-year window permits Bureau-led consultations, and prior assessment cycles generally secured schedules despite contentious negotiations. Further conflict over the synthesis report's timing or author workload could defer a decision again; a Bureau compromise package would raise the odds.

Answer

Grok (xAI): 62% — Whether IPCC-66 plenary (early 2027) adopts a decision text on AR7 cycle dates. Plenary must clear a Bureau-drafted schedule after IPCC-65 deadlock on 2028 vs later SYR; no other body can set it. Post-failure IPCC sessions historically succeed ~65-75% of the time (AR5/AR6 cycles); this sits slightly below due to ongoing US/Saudi/China friction. A walk-out or explicit rejection by one major emitter at the next session would most change the odds.

Answer

DeepSeek (DeepSeek): 14% — IPCC plenary scheduling fights have repeatedly slipped; a one-year window is too tight for consensus on AR7 timing. IPCC-65 (2025) deadlocked on AR7 timeline, with Saudi Arabia and India resisting tight schedules; no plenary is scheduled to force a binding decision before late 2027. Any agreement needs consensus from ~195 governments, and past schedule decisions (AR6, AR7 scoping) slipped 12-24 months beyond initial targets. The 2027 IPCC plenary could adopt a schedule, but only if the US and oil-producing states drop objections to a 2027-2028 special report cadence.

Answer

Qwen (Alibaba): 33% — Persistent gridlock at IPCC-65 signals substantive disagreement unlikely to dissolve in one intersessional gap. IPCC Plenary decisions require full consensus; the failure at IPCC-65 reflects real splits over scope, format, and pace that one intersessional period rarely resolves. Historically the IPCC has always eventually agreed on AR schedules, but typically after multiple failed sessions—AR6 scoping itself took two plenaries to finalize. A breakthrough would most likely require a bureau-facilitated compromise text circulated before the plenary; absent evidence of such a draft, the default is continued…

Governments agree on the AR7 publication schedule at the next IPCC meeting.

EU environment ministers reach agreement by December 2026 on the pending market-related climate file.

The European Commission presents its climate resilience plan during the final week of October 2026.

Global annual greenhouse gas emissions peak before 2030.

Global mean sea level rises by more than 10 centimeters above 2020 baselines by 2035.