NASA's Psyche spacecraft arrives at asteroid Psyche by the end of summer 2029.

Question

Six frontier AI models put this at 84% by 31 Oct 2029. Full reasoning from every model.

WillHappen.ai · Accepted Answer

84% — the median of 6 frontier models, resolving by 2029-10-31.

Answer

Gemini (Google): 91% — Arrival hinges on continuous Hall thruster operation and power system reliability over the remaining three-year cruise. NASA's baseline timeline schedules arrival for August 2029, leaving a two-month buffer before the October 31 deadline. Deep space SEP missions like Dawn demonstrate high cruise reliability, with critical hardware failures historically under 10%. A failure in two or more electric thruster strings or solar array degradation would be needed to derail the arrival schedule.

Answer

Claude (Anthropic): 80% — Hinges on continuous electric propulsion and trajectory maintenance holding through mid-2029 with no major fault. Mission timeline targets August 2029 arrival after the 2023 launch and 2026 Mars flyby already executed successfully. Ion propulsion missions (Dawn, Hayabusa2) show solid reliability once past early fault periods, supporting a high base rate for eventual arrival. Main risk is an extended safe-mode or thruster degradation event that could delay rendezvous beyond October 2029, which would most change this estimate.

Answer

GPT (OpenAI): 78% — The odds hinge on the solar-electric propulsion system sustaining its planned cruise and final approach after Mars. NASA must keep Psyche’s Hall thrusters, power, and navigation healthy through the planned August 2029 rendezvous. The mission already recovered from 2022 software delays and has completed its Mars flyby, materially reducing schedule risk. Deep-space missions commonly retain meaningful propulsion or spacecraft-fault risk; a major thruster anomaly would most change this estimate.

Answer

Grok (xAI): 82% — SEP thrusting and nav must stay healthy for the planned Aug 2029 insertion. JPL must keep Hall thrusters and TCMs on the post-Mars trajectory through summer 2029; flyby already complete. Post-launch NASA SEP asteroid missions (Dawn) arrive on time ~90% of the time; Psyche’s earlier pauses put it a bit below that. A 2027–28 thruster or power failure is the event that would slip arrival past end of summer.

Answer

DeepSeek (DeepSeek): 91% — Whether Psyche's electric propulsion keeps thrusting without a major failure through the 2029 rendezvous. Psyche launched October 2023 and completed its Mars gravity assist in May 2026, so the remaining cruise is a well-understood solar-electric spiral with no further… NASA has already demonstrated multi-year Hall thruster cruise on Dawn (2007-2011), and Psyche's thrusters and power margins are healthy, putting this above the ~85% base… The main risk is a thruster or power-system degradation forcing a trajectory replan, but even a partial failure would likely still permit arrival by late 2029 given the…

Answer

Qwen (Alibaba): 85% — Long-duration ion thrusting is the main risk; hardware must survive ~3 more years of near-continuous operation. Dawn's ion engines ran for years without critical failure, and Psyche carries redundant thrusters and power systems designed for this profile. Post-commissioning NASA deep-space missions fail at roughly 10-15% over multi-year cruises, mostly from single-point electronics or comm failures. A thruster degradation anomaly or safe-mode event from which recovery fails would be the most likely path to missing arrival.

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