Below are leading AI-enabled procurement platforms that automate purchasing workflows, grouped by typical buyer need (enterprise S2P, supplier discovery / autonomous sourcing, AP/invoice automation, and mid‑market). For each I include what it automates, where its AI strengths are, and who it’s best for.

Enterprise source‑to‑pay (S2P) suites — best for large organizations wanting end‑to‑end automation

• Coupa — AI‑driven source‑to‑pay platform: guided/guided buying, catalog/PO automation, spend analytics and growing Generative AI automation for RFPs, approvals and savings opportunities. Best for enterprises that want a single S2P suite with embedded AI. (Coupa.com)
• SAP Ariba / SAP Business Network — embeds SAP’s Joule copilot across Ariba and Business Network to automate intake, create RFPs, produce supplier summaries and speed buying tasks; strong if you’re already SAP/S4HANA. (news.SAP.com)
• Oracle Fusion Cloud Procurement — Oracle’s S2P with embedded AI and generative features (contract term extraction, guided PO/invoice generation) that integrate tightly into Oracle Fusion apps. Good for large Oracle customers. (Oracle.com)
• Ivalua — Source‑to‑pay platform with an “Intelligent Virtual Assistant” (GenAI) for document Q&A, contract extraction and no‑code GenAI use‑case building. Suited for organizations that want strong configurability plus GenAI features. (en.Ivalua.com)
• GEP SMART — unified AI‑first S2P with AI spend analysis, guided buying, sourcing automation and contract intelligence; designed for enterprises that want rapid deployment and integrated category/sourcing tools. (gep.com)
• JAGGAER — end‑to‑end procurement with a procurement‑native AI copilot/orchestrator (JAI) roadmap to assist and automate sourcing, contract and PO workflows; strong in direct materials and complex categories. (JAGGAER.com)

AI‑first / autonomous sourcing and supplier discovery — best for supplier discovery, tail‑spend automation and faster sourcing

• Fairmarkit — autonomous sourcing platform using agentic AI to automate sourcing events (esp. tail and tactical spend), run sourcing to award, and increase the number of events per buyer. Good for scaling sourcing coverage and automating repetitive sourcing. (Fairmarkit.com)
• Scoutbee — AI supplier intelligence and discovery: large supplier network and AI matching to find/qualify suppliers quickly; often used to augment Ariba/Coupa sourcing with supplier discovery. Good for supplier discovery, resiliency and nearshoring. (scoutbee.com)

Accounts‑payable / invoice automation (automates invoice capture, matching, exception handling)

• Basware — market leader in invoice lifecycle management and “touchless” invoice processing (AI/ML for capture, PO/invoice matching and exceptions). Strong for organizations whose primary need is AP automation and straight‑through processing. (news.basware.com)
• AppZen (often used integrated with S2P platforms) — AI audit and invoice validation to find compliance or duplicate‑payment risks; frequently embedded with platforms like JAGGAER to automate AP reviews. (See JAGGAER–AppZen partnership for example.) (businesswire.com)

Mid‑market / fast deployments — best for smaller procurement teams or rapid rollouts

• Procurify / Precoro / similar mid‑market eProcurement systems — simpler guided buying, approvals, PO issuance and basic analytics; many vendors are adding AI features (recommendations, invoice OCR). Good if you need quick wins and lower TCO. (Examples: Procurify, Precoro — compare by integration and AI features.) [vendor sites / market research]

How to pick the “best” one for your organization (practical checklist)

• Define the scope: Do you need full S2P (sourcing → contracts → P2P) or just AP/isolation (invoicing/PO matching) or supplier discovery/tail‑spend automation?
• Systems fit: prefer vendors with proven, native integrations to your ERP (SAP/Oracle/NetSuite/etc.), single‑sign‑on and data residency/SDLC controls.
• AI capability: evaluate concrete AI use cases (touchless invoice rate, RFP auto‑scoring, contract clause extraction, guided buying) and ask for measured outcomes from reference customers.
• Data/privacy & governance: confirm how models are trained, whether customer data is retained, and vendor controls for hallucination/mis‑automation.
• Measure success: pilot with KPIs such as touchless AP rate, cycle time for sourcing/RFP, percent spend under management, maverick spend reduction and near‑term ROI.

Quick recommended next steps

1. Shortlist 2–4 vendors by scope (S2P vs AP vs sourcing).
2. Run a 6–12 week pilot on a high‑volume, well‑scoped workflow (e.g., non‑PO invoices, tail‑spend sourcing, requisition→PO approvals). Track touchless % and cycle time.
3. Validate ERP integration, security & model governance, and collect reference customer outcomes.

If you want, I can:

• narrow this to platforms best for a particular ERP (SAP/Oracle/NetSuite), company size or industry; or
• create a short RFP / pilot checklist you can send to vendors.

Sources (examples used above): Coupa product/press materials; Zycus press + IDC recognition; SAP Ariba / SAP Joule announcements; Oracle Fusion Procurement press; Ivalua IVA pages; JAGGAER JAI materials and JAGGAER–AppZen partnership; GEP SMART product pages; Basware AP leader announcements; Fairmarkit and Scoutbee product pages. (Coupa.com)

Would you like a shortlist targeted to your environment (ERP, company size, priority workflow) or a sample RFP/pilot checklist I can generate now?