Gradient Labs vs Sierra
Which Agents AI tool is better in 2026?
Gradient Labs
Procedural AI agents that deliver specialist customer support for regulated industries.
Sierra
Conversational AI agents for every business
Side-by-side
| Gradient Labs | Sierra | |
|---|---|---|
| Tagline | Procedural AI agents that deliver specialist customer support for regulated industries. | Conversational AI agents for every business |
| Founded | 2023 | 2023 |
| HQ | London, GB | San Francisco, US |
| Employees | 11-50 | 100-200 |
| Total funding | $13M | $2.2B |
| Latest round | Series A · Jul 2025 | Series D · May 2026 |
| Valuation | — | $15.8B |
| Cheapest paid plan | Pricing not disclosed | — |
| Free plan | ✗ | ✗ |
| Free trial | ✗ | ✗ |
| Top tier price | Pricing not disclosed | Enterprise · Contact sales |
| Pricing summary | Pricing not listed | 1 published plans |
| Categories |
Capability matrix
Developer-facing capabilities and access signals for Gradient Labs and Sierra.
| Capability | Gradient Labs | Sierra |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✓ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✗ | ✗ |
| Free trial | ✗ | ✗ |
| Verified | ✗ | ✓ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Gradient Labs
- Strong in AI Agents
🔵 Strengths of Sierra
- Has raised more capital ($2.2B vs $13M)
- Higher Neuron score (65 vs 43)
- Verified profile
Which should you choose?
Choose Sierra if price matters most — it starts at Enterprise · Contact sales, 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 Sierra if you want the most established option — it has raised $2.2B, 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
Gradient Labs vs Sierra — which is better?
It depends on your priority. Gradient Labs is the leaner option; Sierra has broader feature depth. See the side-by-side table above.
Is Gradient Labs cheaper than Sierra?
No — Sierra's cheapest paid plan is Enterprise · Contact sales, while Gradient Labs's is Pricing not listed.
Do Gradient Labs and Sierra offer free plans?
Gradient Labs: Paid only. Sierra: Paid only.
Explore more AI Agents tools
Contextual paths to related AI startups, deals and rankings.