Lightmatter vs PSI Quantum
Which + Quantum AI tool is better in 2026?
Lightmatter
Photonic chips that move data with light for next-gen AI data centers
PSI Quantum
Photonic quantum computing for fault-tolerant AI workloads.
Side-by-side
PSI Quantum is the more established option (raised $2.3B), but Lightmatter is cheaper to start.
| Metric | Lightmatter | PSI Quantum |
|---|---|---|
| Taglinei | Photonic chips that move data with light for next-gen AI data centers | Photonic quantum computing for fault-tolerant AI workloads. |
| Foundedi | 2017 | 2016🏆 |
| HQi | Boston, US | Palo Alto, US |
| Employeesi | 201-500 | 201-500 |
| Neuron scorei | 65🏆 | 59 |
| Total fundingi | $850M | $2.3B🏆 |
| Latest roundi | Series D · Oct 2024 | Series E · Sep 2025 |
| Valuationi | $4.4B | $7B🏆 |
| Cheapest paid plani | —🏆 | Pricing not disclosed |
| Free plani | ✗ | ✗ |
| Free triali | ✗ | ✗ |
| Top tier pricei | Enterprise · Contact sales | Pricing not disclosed |
| Pricing summaryi | 1 published plans | Enterprise · Contact sales |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Lightmatter and PSI Quantum.
| Capability | Lightmatter | PSI Quantum |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✓ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | 1 (CUDA-Q) |
| Free plan | ✗ | ✗ |
| Free trial | ✗ | ✗ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Lightmatter
- Higher Neuron score (65 vs 59)
- Newer company (2017)
🔵 Strengths of PSI Quantum
- Has raised more capital ($2.3B vs $850M)
- More mature (2016)
Which should you choose?
Choose Lightmatter if price matters most — it starts at Enterprise · Contact sales, which is friendlier for teams watching burn. Both AI + Quantum tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose PSI Quantum if you want the most established option — it has raised $2.3B, 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
Lightmatter vs PSI Quantum — which is better?
It depends on your priority. Lightmatter is the leaner option; PSI Quantum has broader feature depth. See the side-by-side table above.
Is Lightmatter cheaper than PSI Quantum?
Yes — Lightmatter's cheapest paid plan is Enterprise · Contact sales, while PSI Quantum's is Enterprise · Contact sales.
Do Lightmatter and PSI Quantum offer free plans?
Lightmatter: Paid only. PSI Quantum: Paid only.
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