Celestial AI vs Fluidstack
Which Infrastructure AI tool is better in 2026?
Celestial AI
Photonic Fabric optical interconnect for AI infrastructure
Fluidstack
London-based AI cloud platform providing large-scale GPU compute for training and inference
Side-by-side
Fluidstack is the more established option (raised $903M); pricing is comparable on both sides.
| Metric | Celestial AI | Fluidstack |
|---|---|---|
| Taglinei | Photonic Fabric optical interconnect for AI infrastructure | London-based AI cloud platform providing large-scale GPU compute for training and inference |
| Foundedi | 2020 | 2017🏆 |
| HQi | Santa Clara, United States | London, United Kingdom |
| Employeesi | — | 11-50🏆 |
| Neuron scorei | 77🏆 | 50 |
| Total fundingi | $515M | $903M🏆 |
| Latest roundi | Series C1 · Mar 2025 | Series B · Dec 2025 |
| Valuationi | — | $7.5B🏆 |
| Cheapest paid plani | Pricing not disclosed | Pricing not disclosed |
| Free plani | ✗ | ✓ |
| Free triali | ✗ | ✓ |
| Top tier pricei | Pricing not disclosed | Pricing not disclosed |
| Pricing summaryi | Custom | Free |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Celestial AI and Fluidstack.
| Capability | Celestial AI | Fluidstack |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✗ | ✓ |
| Free trial | ✗ | ✓ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Celestial AI
- Higher Neuron score (77 vs 50)
- Newer company (2020)
🔵 Strengths of Fluidstack
- Has raised more capital ($903M vs $515M)
- Offers a free plan
- Offers a free trial
- More mature (2017)
Which should you choose?
Choose Fluidstack if price matters most — it starts at Free, which is friendlier for teams watching burn. Both AI Infrastructure tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose Fluidstack if you want the most established option — it has raised $903M, 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
Celestial AI vs Fluidstack — which is better?
It depends on your priority. Celestial AI is the leaner option; Fluidstack has broader feature depth. See the side-by-side table above.
Is Celestial AI cheaper than Fluidstack?
No — Fluidstack's cheapest paid plan is Free, while Celestial AI's is Custom.
Do Celestial AI and Fluidstack offer free plans?
Celestial AI: Paid only. Fluidstack: Yes, has a free plan.
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