EleutherAI vs Physical Intelligence
Which Foundation Models AI tool is better in 2026?
EleutherAI
Non-profit open-source AI research lab behind GPT-J, GPT-NeoX, Pythia and The Pile
Physical Intelligence
Foundation models for physical world AI
Side-by-side
Physical Intelligence is the more established option (raised $600M); pricing is comparable on both sides.
| Metric | EleutherAI | Physical Intelligence |
|---|---|---|
| Taglinei | Non-profit open-source AI research lab behind GPT-J, GPT-NeoX, Pythia and The Pile | Foundation models for physical world AI |
| Foundedi | 2020🏆 | 2023 |
| HQi | United States | San Francisco, US |
| Employeesi | — | 100-200🏆 |
| Neuron scorei | 27 | 67🏆 |
| Total fundingi | Undisclosed | $600M🏆 |
| Latest roundi | — | Series B · Nov 2025 |
| Valuationi | — | $5.6B🏆 |
| Cheapest paid plani | Pricing not disclosed | — |
| Free plani | ✓ | ✗ |
| Free triali | ✗ | ✗ |
| Top tier pricei | Pricing not disclosed | Enterprise · Contact sales |
| Pricing summaryi | Free | 1 published plans |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for EleutherAI and Physical Intelligence.
| Capability | EleutherAI | Physical Intelligence |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✓ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | 1 (Python) | 1 (Python) |
| Free plan | ✓ | ✗ |
| Free trial | ✗ | ✗ |
| Verified | ✗ | ✓ |
| Active deal | ✗ | ✗ |
🟢 Strengths of EleutherAI
- Offers a free plan
- More mature (2020)
🔵 Strengths of Physical Intelligence
- Has raised more capital ($600M vs Undisclosed)
- Higher Neuron score (67 vs 27)
- Newer company (2023)
- Verified profile
Which should you choose?
Choose Physical Intelligence if price matters most — it starts at Enterprise · Contact sales, 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 Physical Intelligence if you want the most established option — it has raised $600M, 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
EleutherAI vs Physical Intelligence — which is better?
It depends on your priority. EleutherAI is the leaner option; Physical Intelligence has broader feature depth. See the side-by-side table above.
Is EleutherAI cheaper than Physical Intelligence?
No — Physical Intelligence's cheapest paid plan is Enterprise · Contact sales, while EleutherAI's is Free.
Do EleutherAI and Physical Intelligence offer free plans?
EleutherAI: Yes, has a free plan. Physical Intelligence: Paid only.
Explore more Foundation Models tools
Contextual paths to related AI startups, deals and rankings.