Forethought vs Sierra (2026)

Forethought

by Forethought AI

Sierra

by Sierra

Pros

• ✓Four agents cover support: Solve resolves issues end to end, Triage classifies and routes tickets, Discover drafts articles for knowledge gaps, and QA scores 100% of human agent tickets.
• ✓Solve is trained on a customer's historical support data and works across chat, email, voice, Slack and a headless API, with support for 100+ languages.
• ✓Forethought's integrations page lists 70+ helpdesk, knowledge, connector and call center integrations, including Zendesk, Salesforce, ServiceNow, HubSpot and Amazon Connect.

Limitations

• –Pricing is quote-only on every plan, so a buyer cannot estimate cost without a sales conversation, and Forethought does not publish its contract terms.
• –Email, voice and Slack agents start on the Professional plan, the Solve API and knowledge gap detection are Enterprise features, and Multibrand and Discover are sold as add-ons.
• –Zendesk completed its acquisition of Forethought on March 26, 2026, and now offers it as Forethought AI Agents by Zendesk.

Pros

• ✓Co-founded by Bret Taylor, a former Salesforce co-CEO and OpenAI board chair, and Clay Bavor, an 18-year Google veteran who led Google Labs and Lens. Sierra has raised $1B+, most recently at a $15.8B valuation, and said it passed $400M in ARR in October 2026.
• ✓Outcome-based pricing charges per resolved interaction rather than per seat or conversation, so what a buyer pays tracks resolutions delivered rather than seats purchased.
• ✓Compliance covers FedRAMP High, SOC 2 Type II, ISO 27001, ISO 42001, AIUC-1, HIPAA, GDPR and CCPA, with named audit reports for SOC 2 and HIPAA available under NDA through the trust center.

Limitations

• –Sierra publishes no pricing page, no rate card, no minimum commitment and no per-outcome rate. Every commercial term including the definition of a resolved outcome is negotiated directly.
• –Deployment is sales-led with no self-serve signup. Published customer go-live timelines run from two to ten weeks, and integrations with proprietary systems need custom work through Sierra's integration framework or Agent SDK.
• –Sierra counts 40+ pre-built integrations but does not list them publicly, so buyers confirm coverage in a sales conversation. The MCP route is scoped to ChatGPT Apps, so teams standardizing on another MCP client have no documented endpoint.