LMArena vs Reflection AI
Which Foundation Models AI tool is better in 2026?
LMArena
Crowdsourced leaderboard for ranking AI models
Reflection AI
America's open frontier AI lab building autonomous coding agents
Side-by-side
Reflection AI leads on both fronts — more capital raised ($2.1B) and a lower entry price than LMArena.
| Metric | LMArena | Reflection AI |
|---|---|---|
| Taglinei | Crowdsourced leaderboard for ranking AI models | America's open frontier AI lab building autonomous coding agents |
| Foundedi | 2025 | 2024🏆 |
| HQi | Berkeley, United States | New York, US |
| Employeesi | — | 51-100🏆 |
| Neuron scorei | 73 | 82🏆 |
| Total fundingi | $250M | $2.1B🏆 |
| Latest roundi | Series A · Jan 2026 | Series B · Oct 2025 |
| Valuationi | $1.7B | $8B🏆 |
| 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 | Enterprise · Contact sales |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for LMArena and Reflection AI.
| Capability | LMArena | Reflection AI |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | 2 (python, typescript) |
| Free plan | ✓ | ✗ |
| Free trial | ✓ | ✗ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of LMArena
- Offers a free plan
- Offers a free trial
- Newer company (2025)
🔵 Strengths of Reflection AI
- Has raised more capital ($2.1B vs $250M)
- Higher Neuron score (82 vs 73)
- More mature (2024)
Which should you choose?
Choose Reflection AI 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 Reflection AI if you want the most established option — it has raised $2.1B, 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
LMArena vs Reflection AI — which is better?
It depends on your priority. LMArena is the leaner option; Reflection AI is cheaper to start. See the side-by-side table above.
Is LMArena cheaper than Reflection AI?
No — Reflection AI's cheapest paid plan is Enterprise · Contact sales, while LMArena's is Free.
Do LMArena and Reflection AI offer free plans?
LMArena: Yes, has a free plan. Reflection AI: Paid only.
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