Auterion vs Castelion
Which Defense AI AI tool is better in 2026?
Auterion
Software-defined autonomy and AI for drone swarms across air, land and sea
Castelion
Mass-producing affordable hypersonic weapons for defense
Side-by-side
Castelion is the more established option (raised $469M); pricing is comparable on both sides.
| Metric | Auterion | Castelion |
|---|---|---|
| Taglinei | Software-defined autonomy and AI for drone swarms across air, land and sea | Mass-producing affordable hypersonic weapons for defense |
| Foundedi | 2017🏆 | 2022 |
| HQi | Arlington, US | El Segundo, US |
| Employeesi | 201-500 | 201-500 |
| Neuron scorei | 76 | 76 |
| Total fundingi | $180M | $469M🏆 |
| Latest roundi | Series B · Sep 2025 | Series B · Dec 2025 |
| Valuationi | $600M🏆 | — |
| Cheapest paid plani | Pricing not disclosed | Pricing not disclosed |
| Free plani | ✗ | ✗ |
| Free triali | ✗ | ✗ |
| Top tier pricei | Pricing not disclosed | Pricing not disclosed |
| Pricing summaryi | Enterprise · Contact sales | Enterprise · Contact sales |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Auterion and Castelion.
| Capability | Auterion | Castelion |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✓ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✗ | ✗ |
| Free trial | ✗ | ✗ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Auterion
- More mature (2017)
🔵 Strengths of Castelion
- Has raised more capital ($469M vs $180M)
- Newer company (2022)
Which should you choose?
Choose Castelion if price matters most — it starts at Enterprise · Contact sales, which is friendlier for teams watching burn. Both Defense AI tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose Castelion if you want the most established option — it has raised $469M, suggesting more runway for enterprise features, support, and long-term roadmap. For mission-critical workflows or larger teams, that stability often outweighs a lower monthly price.
Frequently asked questions
Auterion vs Castelion — which is better?
It depends on your priority. Auterion is the leaner option; Castelion has broader feature depth. See the side-by-side table above.
Is Auterion cheaper than Castelion?
No — Castelion's cheapest paid plan is Enterprise · Contact sales, while Auterion's is Enterprise · Contact sales.
Do Auterion and Castelion offer free plans?
Auterion: Paid only. Castelion: Paid only.
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