Glean vs Sierra: 2026 comparison
Enterprise AI worker — unified search, work assistant, and custom agents grounded in your company knowledge.
Glean vs Sierra — specs
| Spec | Glean | Sierra |
|---|---|---|
| Agent Rank | 80 / 100 (A) | 78 / 100 (A) |
| Autonomy | Assistant | Autonomous |
| Pricing | Subscription · Free tier | Subscription · Free tier |
| Open source | No | No |
| Capabilities | RAG, Memory, Tool use | Voice, Tool use, Memory, RAG |
| Integrations | 6 apps | 3 apps |
| Verified | Verified | Verified |
| Released | Feb 2025 | Feb 2025 |
Agent Rank breakdown
- Autonomy fit
- 7
- Capabilities
- 6
- Integrations
- 10
- Pricing value
- 9
- Polish & maturity
- 6
- Verifiability
- 10
Auto-computed from autonomy, capabilities, integrations, pricing, maturity and editorial verification. Updated every deploy. How is this computed?
- Autonomy fit
- 9
- Capabilities
- 8
- Integrations
- 6
- Pricing value
- 9
- Polish & maturity
- 5
- Verifiability
- 10
Auto-computed from autonomy, capabilities, integrations, pricing, maturity and editorial verification. Updated every deploy. How is this computed?
Pros & cons
- +Single best enterprise knowledge agent in 2026 — instant grounding in your company data
- +Custom Agents (Glean Agents) let teams build internal workflows without code
- +Strong permission-aware retrieval — agents see only what users are allowed to
- −Enterprise-only — typically $50K+ ACV minimum
- −Initial connector setup takes weeks for full coverage
- −Pricier than ChatGPT Enterprise on a per-seat basis
- +Best-in-class for branded customer-facing agents (voice + chat parity)
- +Concierge onboarding from one of the strongest teams in AI
- +Indistinguishable-from-human quality in tier-1 deployments
- −Enterprise-only pricing — typical contracts $150–500k/year
- −Deployment is white-glove, not SaaS — multi-week setup
- −Overkill for SMB or mid-market support volumes
Pricing
- +Unified search across 100+ apps
- +Work assistant + custom agents
- +SSO + enterprise data isolation
- +Voice + chat
- +Custom persona
- +White-glove implementation
- +SOC 2 II + HIPAA option
Which one should you pick?
Pick Sierra if you want the highest autonomy and the verification loop is in place.
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Frequently asked
Should I pick Glean or Sierra in 2026?+
Pick Glean if your stack spans many tools and integration depth is the constraint. Pick Sierra if you want the highest autonomy and the verification loop is in place. Most working teams running both can use Glean for primary work and Sierra for the workflows where its specific strengths matter.
What's the price difference between Glean and Sierra?+
Both Glean and Sierra start in the same pricing range (Subscription · Free tier vs Subscription · Free tier). Total cost of ownership depends on your team size and volume — see the TCO calculator for your specific math.
Which is more autonomous, Glean or Sierra?+
Sierra is the more autonomous of the two (Autonomous vs Assistant). Higher autonomy ships throughput faster but requires verification loops in place — see our autonomous-vs-copilot framing for when each tier wins.