One page: what each of the six 2026 newcomers is (Manus AI, Claude Agent SDK, OpenAI Agents SDK/Swarm, Google ADK + Vertex AI Agent Builder, n8n, Zapier); the buy-to-build spectrum; the head-to-head comparison; the pricing-unit warning (credits vs tasks vs tokens); and the decision rules — choose by who builds it, then model and cloud.
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