By Sagar Shankaran, Founder of CallSphere
Horizontal SaaS multiples down 35% YoY. Vertical SaaS up 3%. 60% of 2025 AI capital went to mega-rounds, but the alpha shifted to vertical AI. The full thesis.
Key takeaways
Horizontal SaaS multiples down 35% YoY. Vertical SaaS up 3%. 60% of 2025 AI capital went to mega-rounds, but the alpha shifted to vertical AI. The full thesis.
The investment thesis split in 2026 is now empirical, not theoretical. Key data points:
The "last mile" framing from NEA's Tiffany Luck: horizontal models like ChatGPT take a user from 0% to 80% on a generic task. Moats are built by solving the last 20% — the operational, integrated, regulated workflow that horizontals cannot serve at scale.
flowchart LR
subgraph Horizontal["Horizontal AI · 2026"]
HFunding[60% of capital · mega-rounds]
HMult[Multiples -35% YoY]
HMoat[Weak app-layer moat]
HFunding --> HMoat --> HMult
end
subgraph Vertical["Vertical AI · 2026"]
VFunding[Distributed Series A/B]
VMult[Multiples +3% · premium M&A]
VMoat[Domain data + workflow + reg]
VFunding --> VMoat --> VMult
end
User[Buyer / End user] --> Last[Last 20% workflow]
Last --> Vertical
User -. 0-80% generic .-> Horizontal
This is the most important investment-thesis shift since cloud-vs-on-prem. Horizontal AI is not dying; it is becoming infrastructure, like AWS, with corresponding margins (durable, but compressed by competition). The alpha — the outsized returns and outsized customer LTV — is moving to vertical AI players who own the workflow, the data, and the customer relationship.
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For founders, this means the playbook is different in 2026: don't build a horizontal AI product unless you have a foundation-model-lab-scale moat. Build for a vertical, own the integration depth, and let horizontals be your supplier. For buyers, this means choosing vertical-specific tools is no longer a "nice to have" — it's the only way to get the last-mile value.
CallSphere is the canonical vertical AI thesis in voice. We span 6 verticals (healthcare, real estate, salon, sales, escalation, behavioral health), with 37 agents, 90+ tools, and 115+ DB tables — every one of those tools and tables is vertical-specific workflow that a horizontal voice agent cannot replicate without rebuilding our last 18 months of customer-driven engineering.
50+ live businesses on a 4.8/5 rating prove the thesis: vertical depth + workflow integration + compliance posture is what sells. Pricing ($149/$499/$1,499) is unit-economically positive on day one because vertical workflow buyers value time-to-deploy over per-seat cost. The 14-day trial proves payback inside two weeks; the 22% affiliate program rewards channel partners who carry the vertical thesis into their networks.
Q: Is horizontal AI a bad investment in 2026? A: Only if you're not at the very top tier. ElevenLabs and Deepgram are still great horizontal infra plays. The middle of horizontal AI is the bad zone.
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CallSphere ships complete AI voice agents per industry — 14 tools for healthcare, 10 agents for real estate, 4 specialists for salons. See how it actually handles a call before you book a demo.
Q: How does CallSphere keep verticals from drifting horizontal? A: Each vertical owns its tool catalog, prompts, and KPIs. The 90+ tools are shared infrastructure but the configuration and workflows are vertical-specific.
Q: What about vertical AI agents that span multiple industries? A: That's what we're doing — the same agentic core powers 6 verticals. The trick is shared infrastructure with vertical-specific configuration, not horizontal product.
Q: Will horizontal AI agents win the SMB market? A: No. SMBs need plug-and-play vertical solutions. They will not configure a horizontal agent — they will buy a salon-specific or healthcare-specific tool that already works.
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Written by
Sagar Shankaran· Founder, CallSphere
Sagar Shankaran is the founder of CallSphere, where he builds production AI voice and chat agents deployed across healthcare, hospitality, real estate, and home services. He writes about agentic AI, LLM engineering, and shipping voice agents that handle real calls in production.
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