Letta vs OpenAI
Which Developer Tools AI tool is better in 2026?
Letta
Memory-first agents that learn and improve from experience with natural language.
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 Letta.
| Metric | Letta | OpenAI |
|---|---|---|
| Taglinei | Memory-first agents that learn and improve from experience with natural language. | Creator of ChatGPT, GPT-4, and the leading frontier AI lab. |
| Foundedi | — | 2015🏆 |
| HQi | US | San Francisco, US |
| Employeesi | 1-10 | 1001-5000🏆 |
| Neuron scorei | 60 | 99🏆 |
| Total fundingi | Undisclosed | $193.3B🏆 |
| Latest roundi | — | Series E · Mar 2026 |
| Valuationi | — | $852B🏆 |
| Cheapest paid plani | — | ChatGPT Plus · $20/mo🏆 |
| Free plani | ✓ Free | ✓ Free |
| Free triali | ✓ | ✗ |
| Top tier pricei | — | ChatGPT Team · $25/mo |
| Pricing summaryi | 1 published plans | 4 published plans |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Letta and OpenAI.
| Capability | Letta | OpenAI |
|---|---|---|
| MCP support | ✗ | ✓ |
| Public API | ✗ | ✓ |
| Webhooks | ✗ | ✓ |
| OAuth 2.0 | ✗ | ✓ |
| SDK languages | 1 (Node.js) | 6 (Python, Node.js, TypeScript, Go…) |
| Free plan | ✓ | ✓ |
| Free trial | ✓ | ✗ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✓ |
🟢 Strengths of Letta
- Offers a free trial
🔵 Strengths of OpenAI
- Has raised more capital ($193.3B vs Undisclosed)
- Higher Neuron score (99 vs 60)
- Lower starting price ($20/mo)
- Newer company (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 AI Developer Tools 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
Letta vs OpenAI — which is better?
It depends on your priority. Letta is the leaner option; OpenAI is cheaper to start. See the side-by-side table above.
Is Letta cheaper than OpenAI?
No — OpenAI's cheapest paid plan is ChatGPT Plus · $20/mo, while Letta's is Free.
Do Letta and OpenAI offer free plans?
Letta: Yes, has a free plan. OpenAI: Yes, has a free plan.
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Contextual paths to related AI startups, deals and rankings.