AI support vs. AI personal agents
Jan-Erik Asplund
TL;DR: As consumers send personal AI agents to shop, cancel subscriptions & request refunds, Sierra is building tools for businesses to control how those agents access their services while expanding its own agents into sales & customer outreach. Sacra estimates Sierra hit $400M ARR in October 2026, up from $130M at the end of 2025. For more, check out our updated report and dataset on Sierra.
We first covered the AI transformation of customer support in our June 2023 interview with Intercom CEO Eoghan McCabe and CSO Des Traynor, and have since followed the space across Intercom (July 2023, March 2025), Sierra (December 2025), Decagon (December 2025), and the AI support agents vs help desk SaaS shift (February 2026).
Now, with Sierra at a Sacra-estimated $400M ARR as of October 2026, we're checking in to understand how the space is evolving after Salesforce’s acquisition of Fin (formerly Intercom) in September.
Key points via Sacra AI:
- With personal agents (Meta Muse, Instinct, Grok Bot, Town) threatening to dramatically increase cancellation & refund requests and to disintermediate retailers from the end-customer by handling research, shopping & checkout, retailers are turning to Sierra to counter AI with AI and take power back via Sierra’s OAuth-like Personal Agent Protocol (with Meta) to choose which 3rd-party agents to allow, which to block and what scope of actions they can take.
- Continuing its expansion across the enterprise (50% of its customers have $1B+ in revenue) with new logos like Banco Santander ($67B revenue), HP ($55B revenue) and Uber ($52B revenue), Sierra is accelerating at scale, doubling from $200M ARR to $400M ARR in five months.
- Compare Sierra at $400M ARR in October 2026, up from $130M at year-end 2025 (+400% YoY in 2025), last valued at $15.8B in its $950M May round (Tiger Global, GV) for a roughly 60x multiple to Fin (formerly Intercom) at roughly $400M ARR growing 27% year-over-year when Salesforce acquired it for ~$3.6B in September, a ~9x acquisition multiple.
- Given the extreme product-market fit of AI support, the space has gotten extremely competitive with Decagon at $100M annualized revenue in August, up from $44M at year-end 2025 (+340% YoY in 2025), valued at $4.5B for a ~100x revenue multiple, now reportedly exploring a sale, Wonderful ($70M annualized revenue in August 2026) raising $550M at a $5B valuation in September 2026, and Parloa ($52M ARR in 2025, up 117% YoY) raising $350M at a $3B valuation in January 2026.
- Just as long-running agents with inference-time reasoning transformed AI coding in early 2026, the same pattern is hitting AI support as AI agents now can make calls & send follow up texts over weeks and months for high-value transactions like loan refinancings, insurance sales & medical approvals (Sierra Horizon, launched July 2026), to drive customer revenue and monetize by taking a cut of the outcome, bringing it closer to its vision of disintermediating and then displacing Salesforce.
For more, check out this other research from our platform:
- Sierra (dataset)
- Eoghan McCabe & Des Traynor, CEO and CSO of Intercom, on the AI transformation of customer service
- Intercom (dataset)
- Decagon (dataset)
- Parloa (dataset)
- Wonderful (dataset)
- Retell AI (dataset)
- Sierra vs Decagon
- Decagon vs Sierra
- AI support agents vs help desk SaaS
- Intercom at $343M/year
- Front vs Intercom
- Retell AI at $60M/year up 650% YoY
