NASA lands a crewed mission on the lunar surface by the end of 2028.

Question

Six frontier AI models put this at 25% by 25 Oct 2029. Full reasoning from every model.

WillHappen.ai · Accepted Answer

25% — the median of 6 frontier models, resolving by 2029-10-25.

Answer

Gemini (Google): 27% — Starship HLS must master complex cryogenic orbital refueling and land uncrewed before Artemis III can fly astronauts down. NASA and SpaceX need double-digit tanker flights and an uncrewed lunar test lander completed by late 2027 to clear flight margins. Major crewed space programs slip an average of 18-24 months at this maturity stage, pushing Artemis III realistically into 2029. A smooth uncrewed Starship lunar landing demonstration by mid-2027 would push this probability above 60%.

Answer

Claude (Anthropic): 9% — HLS lander readiness and Starship/Blue Moon development timelines are the binding constraint, not Artemis II/III dates on paper. NASA has repeatedly slipped Artemis III landing dates (2024→2025→2026→2027→now eyeing 2027-28) reflecting chronic HLS/suit delays. Starship HLS has yet to demonstrate orbital refueling or an uncrewed lunar landing, both required before any crewed attempt, with no firm near-term date. A landing by end-2028 requires Artemis II success (now slated ~2026) plus flawless HLS development in under 2 years, far outpacing historical program slip rates.

Answer

GPT (OpenAI): 38% — The date hinges on Starship HLS reaching a proven, crew-ready lunar-landing capability after Artemis II. NASA must fly Artemis II, certify Orion/SLS operations, and integrate a lander before a 2028 launch window. Apollo-era schedules suggest first-of-kind crewed lunar systems slip; Artemis III has already moved from 2024 to 2027. A successful uncrewed Starship HLS lunar demo and propellant-transfer campaign by 2027 would materially raise the odds.

Answer

Grok (xAI): 22% — SpaceX must finish Starship HLS uncrewed landing plus orbital refueling before a 2028 crewed attempt. NASA needs a successful Artemis II (now likely 2027) then HLS demo before any III landing window in 2028. Human-rated NASA programs have slipped 2+ years on average; HLS refueling and landing add extra unproven steps that sit below that base. A 2027 Starship tanker-to-tanker propellant transfer would be the single event that most raises the odds.

Answer

DeepSeek (DeepSeek): 22% — This turns on whether Starship HLS completes an uncrewed lunar landing demo before Artemis III can fly. Artemis III needs Starship HLS, which as of late 2026 has not yet flown an orbital refueling demo, let alone a lunar landing test. NASA's own OIG and GAO have repeatedly flagged 2027-2028 Artemis III dates as unrealistic; the program has slipped roughly one year per year since 2019. A successful uncrewed Starship lunar touchdown in 2027 would sharply raise the odds; continued refueling delays would push the crewed landing past 2029.

Answer

Qwen (Alibaba): 32% — Starship HLS readiness is the binding constraint; everything else is nearly flight-proven. SpaceX must demonstrate orbital refueling and an uncrewed lunar landing before crewed use—neither has occurred as of Oct 2026, and each adds months of test-and-fix… NASA's reaffirmation on Oct 23 suggests a late-2028 target, but SLS/Orion programs have slipped 3–5 years past original dates; Artemis II itself has already slipped… A single Starship test failure or propellant-transfer anomaly pushing the HLS demo past mid-2028 would make a crewed landing before Jan 2029 nearly impossible.

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