NASA / Boeing · USA
JAXA / Mitsubishi Heavy Industries · Japan
| SLS Block 1 | Metric | H3 |
|---|---|---|
| 95,000 kg+476% | Payload to LEO | 16,500 kg |
| 27,000 kg+315% | Payload to GTO | 6,500 kg |
| 98.1 m+72% | Height | 57 m |
| ~$40,000+/kg | Cost per kg | +627%~$5,500/kg |
| 100%+33% | Success Rate | 75% |
| 2022+0% | First Flight | 2024 |
| No | Reusable | No |
| NASA / Boeing | Company | JAXA / Mitsubishi Heavy Industries |
| USA | Country | Japan |
Payload to Low Earth Orbit (LEO) — relative scale
Payload to Geostationary Transfer Orbit (GTO)
5
SLS Block 1 wins
1
Tied
1
H3 wins
SLS Block 1 delivers 476% more payload to LEO, making it the heavier lifter.
H3 is more cost-effective at ~$5,500/kg vs ~$40,000+/kg.
SLS Block 1 has a higher success rate (100% vs 75%), indicating greater flight heritage.
Overall, SLS Block 1 wins on more metrics (5 vs 1), though each rocket is designed for different mission profiles.