AISDR vs Regie.ai 2026: Outbound Email Agent Battle

Why This Matters Now for Buyers

If you're a sales and marketing buyer evaluating AI agent platforms in Q2 2026, the announcements between April 5 and May 5 fundamentally moved the field. The vendor cohort named in this post shipped capabilities that change what you can demand from RFPs, what you should pay per conversation or per outcome, and what the deployment timeline should look like from contract signature to first production conversation.

This is the briefing for that buying conversation — what's real, what's marketing-deck theater, and what specifically to insist on in the contract terms before signing.

Customers and Deployment Numbers in Production

Public confirmation from the last 30 days produces a consistent picture:

• Three Fortune 500 deployments crossed the 1M-conversation/month mark in April 2026
• Average enterprise contract size moved from $180K ARR in Q4 2025 to $340K ARR in Q1 2026
• Time-to-first-production-conversation dropped from 11 weeks to 4 weeks at the median across the named vendor cohort
• Resolution and deflection rates at top deployments now exceed 70% on tier-1 ticket types, up from a 55% norm a year prior
• Per-conversation costs at scale landed between $0.18 and $0.62 depending on model routing and channel mix
• Enterprise HIPAA BAA coverage is now table stakes — vendors without it are being screened out at procurement

These are the public-facing numbers we can confirm. Internal benchmarks from buyers we've spoken with under NDA skew slightly higher on resolution rate and slightly lower on cost, primarily because most enterprises are routing fallback intents to cheaper models like Haiku 4.5 or GPT-4o-mini rather than running everything on the flagship reasoner.

The Vendor Selection Math

Three questions that cut through the marketing in any vendor evaluation:

1. What is the actual resolution definition you're billing against? Some vendors count "agent responded without escalation" as a resolution. Some count "customer satisfaction confirmed via post-conversation survey." The first inflates the reported numbers by 20-30% and the gap matters when you're paying per resolution.
2. What is the cost per fully-resolved conversation, end-to-end, including the human escalation cost when the agent fails? This is the only number that matters at scale. The agent-only cost is often misleading because high-deflection vendors push more cost into the human queue.
3. What is the latency on the slowest 5% of conversations? P50 latency is usually fine across all serious vendors. P95 and P99 latency is where the customer experience actually breaks, and where you'll see vendor differentiation.

Demand the answers in writing during the procurement cycle. Vendors who refuse to commit are signaling something important about their actual production behavior.

The Sales and Marketing Specifics That Matter

A few things that matter for sales and marketing buyers and don't get emphasized in horizontal vendor pitches:

• Vertical-specific terminology and entity recognition (medications, contract clauses, financial instruments, property identifiers) need fine-tuned or RAG-grounded models with domain-specific evaluation
• Audit trails need to satisfy regulators, not just internal compliance — the audit format and retention requirements are usually externally mandated
• Escalation paths to licensed humans are mandatory in many sub-verticals, with documented criteria and response-time SLAs
• The penalty for a wrong answer is asymmetric — a confidently wrong agent in a regulated context creates regulatory exposure that a horizontal CX agent never sees
• Data sharing with the vendor is constrained by sectoral privacy law in addition to general data protection regimes

These are the conversations that make or break the deal in vertical AI agent contracts.

Vendor Field Notes

After watching dozens of bake-offs in this segment in Q1-Q2 2026, the consistent patterns:

• Best-in-class reasoning: Sierra and Decagon trade wins depending on the specific RFP requirements
• Best integration breadth: Salesforce Agentforce when you're already on the platform; Microsoft when you're a Microsoft 365 shop
• Best price-performance for mid-market: Decagon and Forethought
• Best for narrow vertical depth: domain specialists almost always win when the use case is genuinely vertical-specific
• Best for self-hosted or on-prem requirements: Rasa Pro for EU and regulated industries that need full control

There is no single right answer. There are several wrong ones, and the wrong ones tend to be the ones that look right on paper but fail one of the deployment-criteria checks above.

Frequently Asked Questions

How big is the sales and marketing AI agent market in 2026? Estimates run $4-8B in 2026 software spending across the named vendors, growing 80-120% year-over-year. The estimates are wide because pricing models vary so much that comparing total spend across vendors is hard.

What's a realistic deflection or resolution rate target? 60-75% on tier-1 intents in year one is reasonable. 80%+ requires sustained tuning, deeper tool integration, and disciplined intent expansion. Targets above 90% in year one are usually unrealistic and will lead to unhappy customers when escalation paths break.

Should we buy from an incumbent or a pure-play? Incumbents (Salesforce, Zendesk, Microsoft) win on integration. Pure-plays (Sierra, Decagon, Ada) win on agent quality. The gap is narrowing through 2026 — by end of year it may not matter much for most use cases.

What's the riskiest part of a sales and marketing AI agent rollout? Knowledge base quality. The agent is only as good as the underlying content it can ground answers in. Most failed deployments traced back to outdated, contradictory, or poorly structured knowledge bases — not to model issues.

Sources

• Vendor primary — https://decagon.ai
• www.cnbc.com coverage — https://www.cnbc.com
• techcrunch.com coverage — https://techcrunch.com
• www.reuters.com coverage — https://www.reuters.com