Here's a B-21 Raider vs. B-2 Spirit comparison across design, technology, cost, and mission capability:
? Design & Stealth
| Feature |
B-2 Spirit (1997) |
B-21 Raider (Est. 2025) |
| Shape |
Flying wing |
Flying wing |
| Stealth |
Low-observable (1st gen) |
Next-gen stealth (esp. low-band radar) |
| Materials |
Composite stealth skin (complex) |
Advanced radar-absorbent materials (easier to maintain) |
| Maintenance |
High-maintenance surface coating |
Designed for easier, lower-cost upkeep |
B-21 features “open architecture”, making it easier to upgrade with new tech, sensors, and weapons.
Avionics & Software
| Feature |
B-2 |
B-21 |
| Computing |
1980s tech (upgraded over time) |
Digital-first; cloud-connected |
| Avionics |
Closed systems |
Modular open systems |
| Cyber Resilience |
Limited |
Designed-in cybersecurity |
| Automation |
Manual-intensive |
Greater autonomy, easier mission control |
B-21 can be crewed or optionally uncrewed in the future.
Weapons & Payload
| Feature |
B-2 |
B-21 |
| Payload |
~40,000 lbs |
Estimated ~30,000–35,000 lbs |
| Nuclear Capable |
Yes (B61, B83) |
Yes (B61-12, LRSO) |
| Conventional |
JDAM, JASSM, GBU-57 bunker buster |
All above + next-gen stand-off weapons |
| Future Weapons |
Limited upgrade path |
Designed for hypersonic and future AI-enabled weapons |
B-21 will carry Long-Range Stand-Off (LRSO) missiles and possibly hypersonic weapons in the future.
? Range & Endurance
| Feature |
B-2 |
B-21 |
| Range |
~6,000 nm (without refuel) |
Estimated +6,000–7,000 nm |
| Refueling |
Yes (KC-135, KC-46) |
Yes |
| Global Reach |
Yes (round-the-world flights) |
Yes with higher efficiency |
B-21 is smaller and more efficient, enabling longer loiter and deeper penetration with fewer tankers.
Cost & Production
| Feature |
B-2 |
B-21 |
| Unit Cost |
~$2.1B (adjusted for inflation) |
Estimated ~$692M per unit |
| Built |
21 units |
Target: 100–145 units |
| Support Cost |
High; stealth skin maintenance |
Lower; modular and scalable |
B-21 is designed for mass production, with easier logistics and lower cost per flight hour.
? Survivability & Modern Threats
| Feature |
B-2 |
B-21 |
| Air Defenses |
Vulnerable to newer radars |
Designed to defeat next-gen IADS |
| Counter-A2/AD |
Limited by older systems |
Built to survive in contested, denied environments |
B-21 is built to survive China's and Russia’s next-gen integrated air defenses.
Summary
| Category |
Winner |
Why? |
| Stealth |
B-21 |
New materials, better shaping vs low-frequency radar |
| Technology |
B-21 |
Digital-first, modular, cyber-secure |
| Cost-efficiency |
B-21 |
Mass production, streamlined upkeep |
| Payload |
B-2 |
Heavier payload, larger airframe |
| Survivability |
B-21 |
Designed for 2030s threats |
| Production Scale |
B-21 |
Over 100 expected vs only 21 B-2s built |
