frontier lab

xAI

Organization of Grok 4 in METR's historical TH1 table.

Published evidence

Benchmark2026-01-29

Task-completion time horizons

Benchmark by METR

TH1 (historical estimates)

109 minutes

Grok 4 / METR horizon evaluation

Time Horizon 1.1 ↗

Benchmark2026-09-18

PostTrainBench

Benchmark by PostTrainBench team

PostTrainBench v1.1 · September 2026 results

23.45%

Grok 4.5, High reasoning / Cursor CLI

Benchmark2026-09-30

PostTrainBench

Benchmark by PostTrainBench team

PostTrainBench v1.2 · September 30 release

22.62%

Grok 4.5, High reasoning / Cursor CLI

Relevant sources