Letta vs xAI
Which Agents AI tool is better in 2026?
Letta
Memory-first agents that learn and improve from experience with natural language.
xAI
AI designed to understand the universe
Side-by-side
xAI is the more established option (raised $56B); pricing is comparable on both sides.
| Metric | Letta | xAI |
|---|---|---|
| Taglinei | Memory-first agents that learn and improve from experience with natural language. | AI designed to understand the universe |
| Foundedi | — | 2023🏆 |
| HQi | US | Palo Alto, US |
| Employeesi | 1-10 | 500-1000🏆 |
| Neuron scorei | 60 | 90🏆 |
| Total fundingi | Undisclosed | $56B🏆 |
| Latest roundi | — | Series E · Jan 2026 |
| Valuationi | — | $230B🏆 |
| Cheapest paid plani | — | Pricing not disclosed |
| Free plani | ✓ Free | ✗ |
| Free triali | ✓ | ✗ |
| Top tier pricei | — | Pricing not disclosed |
| Pricing summaryi | 1 published plans | Paid |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Letta and xAI.
| Capability | Letta | xAI |
|---|---|---|
| MCP support | ✗ | ✓ |
| Public API | ✗ | ✓ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | 1 (Node.js) | — |
| Free plan | ✓ | ✗ |
| Free trial | ✓ | ✗ |
| Verified | ✗ | ✓ |
| Active deal | ✗ | ✓ |
🟢 Strengths of Letta
- Offers a free plan
- Offers a free trial
🔵 Strengths of xAI
- Has raised more capital ($56B vs Undisclosed)
- Higher Neuron score (90 vs 60)
- Newer company (2023)
- Verified profile
Which should you choose?
Choose xAI if price matters most — it starts at Paid, which is friendlier for teams watching burn. Both AI Agents tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose xAI if you want the most established option — it has raised $56B, 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
xAI Grok API — free tier on signup
xAI offers a free tier for the Grok API so developers can prototype with Grok-4 and Grok-Code before adding billing.
Terms: Rate-limited.
Frequently asked questions
Letta vs xAI — which is better?
It depends on your priority. Letta is the leaner option; xAI has broader feature depth. See the side-by-side table above.
Is Letta cheaper than xAI?
No — xAI's cheapest paid plan is Paid, while Letta's is Free.
Do Letta and xAI offer free plans?
Letta: Yes, has a free plan. xAI: Paid only.
Explore more AI Agents tools
Contextual paths to related AI startups, deals and rankings.