EleutherAI vs OpenAI
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
OpenAI
Creator of ChatGPT, GPT-4, and the leading frontier AI lab.
Side-by-side
OpenAI leads on both fronts — more capital raised ($193.3B) and a lower entry price than EleutherAI.
| Metric | EleutherAI | OpenAI |
|---|---|---|
| Taglinei | Non-profit open-source AI research lab behind GPT-J, GPT-NeoX, Pythia and The Pile | Creator of ChatGPT, GPT-4, and the leading frontier AI lab. |
| Foundedi | 2020 | 2015🏆 |
| HQi | United States | San Francisco, US |
| Employeesi | — | 1001-5000🏆 |
| Neuron scorei | 64 | 83🏆 |
| Total fundingi | Undisclosed | $193.3B🏆 |
| Latest roundi | — | Series E · Mar 2026 |
| Valuationi | — | $852B🏆 |
| Cheapest paid plani | Pricing not disclosed | ChatGPT Plus · $20/mo🏆 |
| Free plani | ✓ | ✓ Free |
| Free triali | ✗ | ✗ |
| Top tier pricei | Pricing not disclosed | ChatGPT Team · $25/mo |
| Pricing summaryi | Free | 4 published plans |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for EleutherAI and OpenAI.
| Capability | EleutherAI | OpenAI |
|---|---|---|
| MCP support | ✗ | ✓ |
| Public API | ✗ | ✓ |
| Webhooks | ✗ | ✓ |
| OAuth 2.0 | ✗ | ✓ |
| SDK languages | 1 (Python) | 6 (Python, Node.js, TypeScript, Go…) |
| Free plan | ✓ | ✓ |
| Free trial | ✗ | ✗ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✓ |
🟢 Strengths of EleutherAI
- Newer company (2020)
🔵 Strengths of OpenAI
- Has raised more capital ($193.3B vs Undisclosed)
- Higher Neuron score (83 vs 64)
- Lower starting price ($20/mo)
- More mature (2015)
Which should you choose?
Choose OpenAI if price matters most — it starts at Free · From $20/mo, 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 OpenAI if you want the most established option — it has raised $193.3B, 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.
💸 Deals
Free daily tokens via OpenAI data-sharing tier
Eligible OpenAI API tiers can earn free daily tokens on GPT-4.1, GPT-4o, and other models by opting in to share prompts and completions for model improvement.
Terms: Opt-in required. Token allotment varies by tier.
Frequently asked questions
EleutherAI vs OpenAI — which is better?
It depends on your priority. EleutherAI is the leaner option; OpenAI is cheaper to start. See the side-by-side table above.
Is EleutherAI cheaper than OpenAI?
No — OpenAI's cheapest paid plan is ChatGPT Plus · $20/mo, while EleutherAI's is Free.
Do EleutherAI and OpenAI offer free plans?
EleutherAI: Yes, has a free plan. OpenAI: Yes, has a free plan.
Explore more Foundation Models tools
Contextual paths to related AI startups, deals and rankings.