Harmonic vs Recursive Superintelligence
Which Foundation Models AI tool is better in 2026?
Harmonic
Mathematical superintelligence with hallucination-free, verified reasoning
Recursive Superintelligence
Building AI systems that continuously improve themselves
Side-by-side
Recursive Superintelligence is the more established option (raised $650M); pricing is comparable on both sides.
| Metric | Harmonic | Recursive Superintelligence |
|---|---|---|
| Taglinei | Mathematical superintelligence with hallucination-free, verified reasoning | Building AI systems that continuously improve themselves |
| Foundedi | 2023🏆 | 2025 |
| HQi | Palo Alto, US | London, GB |
| Employeesi | 11-50 | 11-50 |
| Neuron scorei | 80🏆 | 72 |
| Total fundingi | $295M | $650M🏆 |
| Latest roundi | Series C · Nov 2025 | Seed · May 2026 |
| Valuationi | $1.4B | $4.7B🏆 |
| Cheapest paid plani | Pricing not disclosed | Pricing not disclosed |
| Free plani | ✓ | ✓ |
| Free triali | ✓ | ✓ |
| Top tier pricei | Pricing not disclosed | Pricing not disclosed |
| Pricing summaryi | Free | Free |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Harmonic and Recursive Superintelligence.
| Capability | Harmonic | Recursive Superintelligence |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✓ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✓ | ✓ |
| Free trial | ✓ | ✓ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Harmonic
- Higher Neuron score (80 vs 72)
- More mature (2023)
🔵 Strengths of Recursive Superintelligence
- Has raised more capital ($650M vs $295M)
- Newer company (2025)
Which should you choose?
Choose Recursive Superintelligence if price matters most — it starts at Free, which is friendlier for teams watching burn. Both Foundation Models tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose Recursive Superintelligence if you want the most established option — it has raised $650M, 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
Harmonic vs Recursive Superintelligence — which is better?
It depends on your priority. Harmonic is the leaner option; Recursive Superintelligence has broader feature depth. See the side-by-side table above.
Is Harmonic cheaper than Recursive Superintelligence?
No — Recursive Superintelligence's cheapest paid plan is Free, while Harmonic's is Free.
Do Harmonic and Recursive Superintelligence offer free plans?
Harmonic: Yes, has a free plan. Recursive Superintelligence: Yes, has a free plan.
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