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Whether that will be achieved in time for 2030 is not settled.","posed_since":"","precise":"Determine whether the mandatory criteria of the CCTF roadmap (Dimarcq et al 2024), including repeated agreement of independent optical clocks and frequency ratios at the low-$10^{-18}$ level, continuous contributions to TAI and intercontinental comparisons at that level, are met by 2029 for one species or for an ensemble defining a weighted geometric-mean frequency.","problem_ref":"7f40ff2864398d0b188c2132ef7ad3152dc9fb621b66d148e7d5fc999667a4bf","references":"","settled_by":"BIPM and CCTF assessment confirming each mandatory criterion with published comparison data.","status_note":"The 28th CGPM (2026) is to consider the choice of option and species; adoption is expected at the earliest at the 29th CGPM in 2030.","title":"Can optical clocks meet the redefinition criteria by 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