Overview
- Transparency
- 5 / 10
- Trust
- 87 / 100
Trains on your data
- Free
- No
- Paid
- No
- Opt-out
- Not captured
Incidents
00
Assessed SEP 21, 2026 · Checked by hand SEP 21, 2026
Sierra asserts SOC 2, ISO 27001, GDPR and HIPAA and says agent data is not used for training; customer retention terms and a public subprocessor list were not found.
Trust breakdown
87 / 100
Overall trust score
Data and privacy
Trains on your data
No training on user data
Storage regions
Not disclosed
Sub-processors
Not disclosed
Data retention
Not disclosed
Powered by
Sierra uses a 'constellation-of-models' approach, orchestrating 15+ frontier, open-weight, and proprietary models. They also invest in fine-tuned models where off-the-shelf models fall short and have developed a custom voice activity detection (VAD) model. They utilize an adaptive routing client to dynamically select and route requests to various foundation model providers.
Integrations and access
Integrations
Available on
Pricing
Enterprise
Custom
Sierra does not publish pricing. They offer an outcome-based pricing model where you pay when the AI agent achieves a predefined successful outcome. The specific per-outcome rate is negotiated individually. Some deployments use a blended model that combines outcome fees with per-conversation pricing for lower-value interactions. Third-party sources estimate annual platform commitments starting around $150,000, with setup fees ranging from $50,000 to $200,000. These figures are not confirmed by Sierra.
Prices as listed on SEP 21, 2026; check the vendor's page.
Timeline
- 2026-03Sierra acquired Opera Tech, a Tokyo-based enterprise AI startup, and launched Ghostwriter, a tool to create agents using plain English prompts.
- 2025-12Sierra launched workspaces within Agent Studio, enabling structured collaboration for agent development.
- 2025-11Sierra launched Insights 2.0, which includes Explorer, a chatbot feature for natural language questions about customer interactions, and Expert Answers, a tool to create knowledge articles from human agent resolutions.
- 2025-09Sierra raised $350 million, also led by Greenoaks, valuing the company at $10 billion.
- 2024-10Sierra raised an additional $175 million led by Greenoaks at a $4.5 billion valuation.
- 2024-02Sierra announced the launch of its conversational AI platform for customer service and a $110 million funding round backed by Sequoia Capital and Benchmark.
Company
Sierra
- Founded
- 2023
- HQ
- San Francisco, California, United States
- Site
- sierra.ai
Popularity
262.3K
monthly visits
Notable customers
Sierra operates at the convergence of conversational AI, contact-center software, and outsourced CX labor, positioning itself as a strategic partner for large B2C enterprises seeking to automate customer support with AI agents.
Value and ROI
What it should move: It shortens resolution time and completes more requests without a handoff.
Best fit
It fits teams ready to connect an agent to billing, account, and fulfilment processes.
The catch
Sierra can change customer accounts. Teams must own permissions, action limits, and escalation rules.
- Rocket Mortgage: Uses Sierra for customer conversations about loans, rates, application status and payments.[1]
- Ramp: Uses Sierra to answer transaction questions and complete card, shipping and address support workflows.[2]
In our stacks for