Bitcoin's fifth block reward halving occurs before June 1, 2028.

Question

Six frontier AI models put this at 97% by 17 Sept 2029. Full reasoning from every model.

WillHappen.ai · Accepted Answer

97% — the median of 6 frontier models, resolving by 2029-09-17.

Answer

Gemini (Google): 96% — Hash rate expansion historically pushes block times below ten minutes, making completion prior to June 2028 overwhelmingly likely. At nominal 10-minute blocks, 210,000 blocks take 1,458 days from April 20, 2024, placing the halving in mid-April 2028. June 1, 2028 provides a 44-day cushion that would require an unprecedented sustained multi-year decline in total mining hash rate to breach. Only a catastrophic global hardware supply ban or fundamental protocol break could depress block production rates sufficiently.

Answer

Claude (Anthropic): 95% — Bitcoin's block production is highly predictable, so the fifth halving landing near early 2028 is near-certain. Bitcoin has produced ~144 blocks/day for 15+ years with consistent difficulty adjustment, making block-height timing very predictable. Current projections place block 1,050,000 around March-April 2028, comfortably before the June 1, 2028 deadline. Main risk is a large sustained hashrate drop or protocol-breaking event, both historically rare and unlikely to shift timing by months.

Answer

GPT (OpenAI): 99% — It turns almost entirely on Bitcoin’s block cadence reaching height 1,050,000 before the June 2028 cutoff. The subsidy change is hard-coded at every 210,000 blocks; no vote, developer action, or exchange decision is required. From the April 2024 halving at block 840,000, 210,000 blocks at roughly 10 minutes each implies about March 2028. It would take an unusually prolonged slowdown of block production—roughly months versus schedule—to push it past June 1.

Answer

Grok (xAI): 93% — 210k blocks after 840000 must be found by 31 May 2028 (avg ≤10.3 min). Difficulty retargets every 2016 blocks keep inter-block time near 10 min; hash-rate growth made prior halvings 1–5 months early. Even a 20 % sustained drop from 2024 levels still finishes by late May 2028. Only a multi-year collapse below 2024 hash rate (no precedent) would slip past 1 June.

Answer

DeepSeek (DeepSeek): 97% — This is a deterministic protocol event; only a catastrophic chain halt or consensus change could push it past June 2028. Bitcoin's difficulty adjustment targets 10-minute blocks, so the ~210,000 blocks from the April 2024 halving to block 1,050,000 take roughly four years, landing in early… Miners have no discretion: the reward schedule is hardcoded in Bitcoin Core, and no fork has ever altered the halving interval in 15 years of operation. The only realistic delay would be a sustained hash-rate collapse or consensus failure freezing block production for months, which has never happened and would be far…

Answer

Qwen (Alibaba): 97% — Halving date is determined by block height, not human decision—only sustained hash rate collapse could delay it past June 2028. Block 1,050,000 is ~210,000 blocks after the April 2024 halving at block 840,000; at ~10 min/block that's ~4 years, landing around March–April 2028. Even a 30% drop in hash rate (which would trigger difficulty adjustment within ~2 weeks) would only push the date back by weeks, not months. The only scenario that breaks this is a catastrophic, sustained global internet failure lasting months—base rate for that is negligible.

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