Castelion vs Overland AI
Which Defense AI AI tool is better in 2026?
Castelion
Mass-producing affordable hypersonic weapons for defense
Overland AI
Off-road ground autonomy for military vehicles in GPS-denied terrain
Side-by-side
Castelion is the more established option (raised $469M); pricing is comparable on both sides.
| Metric | Castelion | Overland AI |
|---|---|---|
| Taglinei | Mass-producing affordable hypersonic weapons for defense | Off-road ground autonomy for military vehicles in GPS-denied terrain |
| Foundedi | 2022 | 2022 |
| HQi | El Segundo, US | Seattle, US |
| Employeesi | 201-500 | 51-200🏆 |
| Neuron scorei | 76🏆 | 73 |
| Total fundingi | $469M🏆 | $142M |
| Latest roundi | Series B · Dec 2025 | Series A · Jan 2025 |
| Valuationi | — | — |
| 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 Castelion and Overland AI.
| Capability | Castelion | Overland AI |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✗ | ✗ |
| Free trial | ✗ | ✗ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Castelion
- Has raised more capital ($469M vs $142M)
- Higher Neuron score (76 vs 73)
🔵 Strengths of Overland AI
- Strong in Defense AI
Which should you choose?
Choose Overland AI 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
Castelion vs Overland AI — which is better?
It depends on your priority. Castelion has raised more capital and is the more established option; Overland AI has broader feature depth. See the side-by-side table above.
Is Castelion cheaper than Overland AI?
No — Overland AI's cheapest paid plan is Enterprise · Contact sales, while Castelion's is Enterprise · Contact sales.
Do Castelion and Overland AI offer free plans?
Castelion: Paid only. Overland AI: Paid only.
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