Moonshot AI vs Sierra
Which Agents AI tool is better in 2026?
Moonshot AI
Maker of Kimi — the long-context AI chatbot.
Sierra
Conversational AI agents for every business
Side-by-side
Moonshot AI leads on both fronts — more capital raised ($3B) and a lower entry price than Sierra.
| Metric | Moonshot AI | Sierra |
|---|---|---|
| Taglinei | Maker of Kimi — the long-context AI chatbot. | Conversational AI agents for every business |
| Foundedi | 2023 | 2023 |
| HQi | Beijing, CN | San Francisco, US |
| Employeesi | 201-500🏆 | 100-200 |
| Neuron scorei | 69🏆 | 66 |
| Total fundingi | $3B🏆 | $2.2B |
| Latest roundi | Series C · May 2026 | Series D · May 2026 |
| Valuationi | $20B🏆 | $15.8B |
| Cheapest paid plani | —🏆 | — |
| Free plani | ✓ Kimi Free | ✗ |
| Free triali | ✗ | ✗ |
| Top tier pricei | — | Enterprise · Contact sales |
| Pricing summaryi | 4 published plans | 1 published plans |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Moonshot AI and Sierra.
| Capability | Moonshot AI | Sierra |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✓ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | 2 (python, javascript) | — |
| Free plan | ✓ | ✗ |
| Free trial | ✗ | ✗ |
| Verified | ✗ | ✓ |
| Active deal | ✓ | ✗ |
🟢 Strengths of Moonshot AI
- Has raised more capital ($3B vs $2.2B)
- Higher Neuron score (69 vs 66)
- Offers a free plan
🔵 Strengths of Sierra
- Verified profile
Which should you choose?
Choose Moonshot AI if price matters most — it starts at Free, 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 Moonshot AI if you want the most established option — it has raised $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
Kimi by Moonshot — free chat with long context
Moonshot's Kimi assistant is free to use with up to 2M-token context — great for document analysis and long-form chat.
Frequently asked questions
Moonshot AI vs Sierra — which is better?
It depends on your priority. Moonshot AI has raised more capital and is the more established option; Sierra has broader feature depth. See the side-by-side table above.
Is Moonshot AI cheaper than Sierra?
Yes — Moonshot AI's cheapest paid plan is Free, while Sierra's is Enterprise · Contact sales.
Do Moonshot AI and Sierra offer free plans?
Moonshot AI: Yes, has a free plan. Sierra: Paid only.
Explore more AI Agents tools
Contextual paths to related AI startups, deals and rankings.