Head to head

Soyuz U vs Vostok 8A92

Two vehicles in the same payload class. Every figure below comes from the same two sources for both rockets, and a row appears only when both publish the input.

Payload to low Earth orbit

Relative

Soyuz U: 6,900 kg

Vostok 8A92: 4,730 kg

Side by side

7 comparable figures

The highlighted value wins the row. Rows where neither direction is better, like length or stage count, highlight nothing.

Metric	Soyuz U	Vostok 8A92
Flights flown	714	44
Success rate	97.2%	90.9%
Payload to LEO (kg)	6,900	4,730
Length (m)	51.1	30.84
Diameter (m)	2.95	2.99
Launch mass (t)	313	281
Stages	3	2

Soyuz U

Flight record

97.2% success rate694 of 714 flown · 20 failed

1973peak 1979 · 47 flights2017

Maiden flight 1973-05-18. Retired.

Vostok 8A92

Flight record

90.9% success rate40 of 44 flown · 4 failed

1962peak 1966 · 10 flights1967

Maiden flight 1962-06-01. Retired.

Soyuz U is built by Russian Federal Space Agency (ROSCOSMOS) of Russia.Vostok 8A92 is built by RKK Energiya of Russia.

Full specifications and the complete launch history for each: Soyuz U · Vostok 8A92.

Specifications from Launch Library 2 by The Space Devs, launch records from Space Index. Derived figures are computed here; see sources and method.