Updated 12 Oct 2026: OpenAI is shutting down Agent Builder and the Evals platform on 30 November 2026. ChatKit stays. See "What changed in 2026" below.

Key takeaway: If you want a polished chat assistant inside your product fast, start with OpenAI's Agents SDK and ChatKit. If you want to connect lots of apps and run reliable background workflows (with schedules, approvals, and retries), start with n8n. Many teams use a hybrid: AgentKit for the chat experience; n8n for the behind-the-scenes automation.
OpenAI: Introducing AgentKit (Oct 6, 2025) · OpenAI: ChatKit docs · OpenAI: Agents & Evals · n8n: 1,000+ integrations · n8n: Pricing · n8n: Self-hosting

OpenAI AgentKit vs n8n in 2026: What Changed

OpenAI is retiring two of AgentKit's main pieces. On 3 June 2026 it announced that Agent Builder, the visual workflow canvas, will shut down on 30 November 2026. The Evals platform becomes read-only on 31 October 2026 and also shuts down on 30 November. ChatKit, the embeddable chat UI, stays available. For new work, OpenAI recommends connecting ChatKit to your own server-side agent, for example one built with the Agents SDK. Teams that would rather build in plain language can recreate a workflow as a Workspace Agent in ChatGPT, which needs a ChatGPT Business, Enterprise or Edu workspace.

That changes the comparison. On the OpenAI side, AgentKit is no longer a visual builder you set against n8n. It is now a code path: the Agents SDK plus ChatKit. n8n is still a visual builder. It runs on n8n Cloud or as a free self-hosted Community edition, and its plans list AI Agent nodes, MCP support and human approval for tool calls.

So the choice is simpler than it was. If people who don't write code will maintain it, pick n8n. If you have developers and want a chat agent inside your own product, use the Agents SDK with ChatKit (see our comparison of AI agent frameworks, including the OpenAI Agents SDK). If you built on Agent Builder, export the workflow as Agents SDK code before 30 November.

The Basics First

What’s an “AI agent”? Think ChatGPT that can look up info, use tools or take actions to finish day to day tasks autonomously.
What’s an “automation”? Steps that move data between tools on a timer or trigger. Not sure which one you need? Here's how we decide when workflow automation is enough and when you need an AI agent.

• AgentKit (OpenAI) → Build agents and customer-ready chat interfaces inside your app/site with ChatKit, then add quality checks (“evals”) and safety (“guardrails”) without extra products. Tools are included with standard API pricing.
  Launch post · ChatKit · Agents/Evals overview · Guardrails (Python)

• n8n → Drag-and-drop automations with 1,000+ integrations, webhooks/schedules, error handling & retries, optional self-hosting.
  Integrations · Error handling · Self-hosting

The 60-Second Choice

ChatKit docs · Agents & evals · n8n integrations

What Each Platform Really Is

AgentKit (OpenAI)
Create a branded chat assistant with ChatKit, plug in actions/knowledge, then measure quality with evals and add guardrails for safe behavior. Most features live in the OpenAI platform; no extra license for these tools—just pay normal API usage.
Announcement (Oct 6, 2025) · Agents/Evals · MCP & connectors · Guardrails · Global Admin Console (rolling out)

n8n
A visual automation builder with 1,000+ integrations, webhooks/schedules, error workflows and retries, RBAC/SSO, and the option to self-host. It also includes AI nodes (e.g., AI Agent and Model Selector) for multi-model logic.
Integrations · Error handling · RBAC/SSO/OIDC · AI Agent node · Model Selector · Self-hosting

Projects You Can Get Started With Today

A simple website chat with AgentKit
1 - Use ChatKit to embed a chat widget on a page and connect it to your own agent backend (Agents SDK).
2 - Add a couple of actions (e.g., fetch FAQ from a doc, create a support ticket).
3 - Add basic evals to track correct/incorrect answers (OpenAI's Evals platform closes on 30 Nov 2026, and OpenAI's migration guide points to Promptfoo); add a guardrail to block unsafe prompts.
Docs: ChatKit · Agents/Evals · Guardrails quickstart

A “when email arrives, do X” automation in n8n
1 - Pick a trigger (Gmail/new row/webhook).
2 - Add steps (look up contact in CRM → draft reply → log to sheet).
3 - Add retry/error workflow so failures alert you, not your customers.
Docs: Integrations · Error handling

Side by Side Comparison

OpenAI connectors · Guardrails · n8n integrations · RBAC/SSO

What It Costs to Start

AgentKit pricing note · n8n pricing · Self-hosting guide

Real-World Scenarios and Which Platform to Choose

1 - Website support concierge

• Use AgentKit: ChatKit widget answers FAQs; add one action (create ticket). Add simple evals (for example with Promptfoo) to track “answered correctly”.

• Upgrade with n8n: Route escalations to Slack/Email; retry API calls; log everything to a sheet.
  Docs: ChatKit · Error workflows

2 - Leads to outreach

• Use n8n: Trigger when a form is submitted, enrich with an API, draft an email, wait for approval, send.

• Add AgentKit later: Surface a “why we reached out” explanation in your app’s chat.
  Docs: n8n integrations · Agents

3 - Internal answers bot

• Use AgentKit: Connect a few sources via connectors/MCP and add guardrails for sensitive data.

• Use n8n: Nightly refresh indexes, notify approvals for restricted topics.
  Docs: MCP/connectors · Guardrails

Risks and How to De-Risk

• Project failure risk: Analysts warn that 40%+ of agentic AI projects could be scrapped by 2027 without clear value and controls. Start tiny, measure one KPI, and expand.
  Source: Reuters on Gartner forecast

• Security & governance:

  • In AgentKit, use guardrails and org admin features as they roll out.
    Guardrails · Global Admin Console

  • In n8n, lean on RBAC/SSO, audit logs, and error workflows to keep automations safe.
    RBAC/SSO · Error handling

The No-Stress Hybrid (How They Work Together)

• Embed ChatKit for an on-brand chat.

• Define 2–3 actions (search doc → create ticket → update CRM).

• When work needs systems access or long runs, call n8n webhook.

• n8n handles approvals/retries and posts the result back to the chat.
  Docs: ChatKit · n8n integrations

Proof Points

• AgentKit stack: Launch notes outline ChatKit, Evals, Guardrails, Agent Builder (beta)—designed to ship customer-ready agents faster (Agent Builder and Evals shut down on 30 Nov 2026).
  OpenAI announcement

• n8n at scale: Teams report real savings and throughput (e.g., Delivery Hero ~200 hours/month saved; StepStone 200+ workflows).
  Delivery Hero case · StepStone case
  Market signal: mainstream coverage of growth and funding.
  Financial Times

30-Day Plan From Zero to First Win

• Days 1–3: Pick one use case + one KPI (“% questions answered w/o escalation”).

• Days 4–10: Ship a thin slice in AgentKit or n8n. Add evals (OpenAI's Evals platform closes on 30 Nov 2026, and OpenAI's migration guide points to Promptfoo) or an error workflow (n8n).

• Days 11–18: Add safety (guardrails in AgentKit; RBAC/approvals in n8n).

• Days 19–30: Pilot with 20–50 real users; keep/kill based on KPI trend; then connect the second tool (hybrid).
  Docs: Agents/Evals · Guardrails · n8n error handling

FAQ

Is OpenAI AgentKit or n8n better for AI agents?

It depends on who will maintain it. n8n suits teams that want a visual builder with lots of app integrations, on cloud or self-hosted. OpenAI's Agents SDK with ChatKit suits developer teams building a chat agent inside their own product. AgentKit's visual canvas, Agent Builder, shuts down on 30 November 2026.

What replaces OpenAI Agent Builder?

OpenAI suggests two paths. You can export the workflow as Agents SDK code (Python or TypeScript) and run it in your own app, or you can recreate it as a Workspace Agent in ChatGPT (Business, Enterprise or Edu). OpenAI says the export won't carry over every behaviour unchanged, so test before you switch. If you want to stay visual, n8n is a third option.

How much do n8n and OpenAI AgentKit cost to start?

n8n Cloud Starter costs €20 a month, billed annually. The Community edition is free to self-host, but you pay for your own hosting. OpenAI included the AgentKit tools in its standard API model pricing, so you pay for the model usage.