This market will resolve to the first 50% time horizon, as reported by METR, for Grok 4.2 / Grok 4.20. If Grok 4.2 is never released, this market resolves N/A. If there is some coding- or other form of specialized version (e.g. Grok 4.20 Code), it will not count for the purpose if this market. A model expected to be called Grok 4.20 Heavy (using parallel test-time compute) would not count for this market, but Grok 4.20 Thinking, Grok 4.20 High, or Grok 4.20 xhigh, would all count for the purpose of this market.
50% time horizon is a measure of AI autonomy based on the length of tasks that AI can do: roughly, it is the time that humans take to complete tasks that an AI system can successfully do 50% of the time. See METR's "Measuring AI Ability to Complete Long Tasks" for the technical definition. Claude 3.7 Sonnet, released in February 2025, was the leading model with a 50% horizon of 59 minutes.
Left bounds inclusive, right bounds exclusive.
See also:
/jim/claude-45-opuss-metr50-horizon (jim's version)
/Bayesian/claude-opus-45s-metr50-time-horizon (my version)
/Bayesian/gemini-3s-50-time-horizon-per-metr
/Bayesian/grok-420s-metr-50-time-horizon (this market)
1,000