A fully lab-grown solid human organ is successfully transplanted into a patient before 2035.

Question

Six frontier AI models put this at 18% by 25 Oct 2036. Full reasoning from every model.

WillHappen.ai · Accepted Answer

18% — the median of 6 frontier models, resolving by 2036-10-25.

Answer

Gemini (Google): 18% — Vascularizing thick, metabolically active parenchyma at human scale requires bioengineering leaps that cannot clear clinical trials by 2034. Complex capillary networks remain unsolved in non-human primate trials, pushing FDA IND submissions for whole solid organs past 2030. Simpler bioengineered tissues like bladders and skin took over a decade to clear trials, while solid organs require multi-lineage functional integration. A successful non-human primate whole-kidney recellularization surviving past six months before 2029 would double this probability.

Answer

Claude (Anthropic): 17% — Hinges on whether decellularized-scaffold or bioprinted organs clear safety trials and reach human transplant by 2035. Current progress is at bladder, trachea, and simple tissue level, not fully functional solid organs like kidney or liver. Bioprinted mini-livers and kidney structures exist only in animal models or early-stage human trials as of 2026, with vascularization unsolved. A breakthrough in vascularized organoid scaffolding within 3-4 years could enable first-in-human transplant by 2035, but no such trial is currently close.

Answer

GPT (OpenAI): 63% — The key is whether vascularized, patient-safe organ constructs can clear first-in-human trials within nine years. Teams must manufacture, vascularize, and secure FDA/EMA authorization for a first-in-human transplant before 25 October 2036. Bladders, tracheas, skin and corneas set a precedent, but no fully lab-grown solid vascular organ has yet shown durable clinical function. A validated large-animal kidney, liver, or heart program with long-term perfusion data by 2030 would raise the odds sharply.

Answer

Grok (xAI): 18% — Vascularized, scaled in-vitro solid organs must work in animals by ~2030 to reach a human by 2035. No lab has yet grown a fully functional vascularized kidney/liver/heart that survives long-term even in large animals. Regulators would still need multi-year IND-enabling and first-in-human trials after that animal proof, leaving little slack. Xeno organs already in patients plus historical 15–25 yr lags on regenerative claims keep this well below base-rate biotech timelines.

Answer

DeepSeek (DeepSeek): 18% — Whether a solid organ grown entirely from cells in a lab reaches a human patient within nine years. Bladder and trachea scaffolds reached patients by 2008-2011, but those were hollow or tissue-coated, not solid vascular organs. Solid organs need billions of cells, a perfusable vascular tree, and immune tolerance; only kidney and liver have credible whole-organ programs. The 2023-2025 kidney and liver transplant attempts in pigs and humans used gene-edited animal organs, not lab-grown ones, so they do not resolve this.

Answer

Qwen (Alibaba): 9% — Vascularization of a full-scale solid organ in a transplantable form has not been demonstrated even in large-animal models as of 2026. No lab-grown solid organ (kidney, liver, heart) has shown sustained function in a large animal; the gap from organoids to transplantable scale is unresolved. Even if a team like United Therapeutics or a decellularization group achieves a milestone by 2029-30, FDA first-in-human approval for a novel bioengineered organ would… A breakthrough in perfusable vascular network fabrication at organ scale would be the single development that could push this above 20%.

A fully lab-grown solid human organ is successfully transplanted into a patient before 2035.

A clinical trial begins testing a vascularized, 3D-bioprinted human organ in patients before 2032.

Standard clinical turnaround for an ex vivo autologous gene editing therapy falls below 14 days before 2030.

An in vivo CRISPR gene editing therapy receives standard FDA approval before 2028.

Human germline gene editing results in a live birth before 2030.