The weekly agent builder changelog: sample issue

1. Frontier Radar: what changed

• 2026-10-15
  Meta releases Muse Spark Open (816B MoE, 42B active, 1M context)
  Open-weight model built for coding and long-horizon agent work; available via OpenRouter, Together, Fireworks, Groq and others — a new self-host/API option for agent backends. Source
• 2026-10-13
  Gemini 4 Argon GA: $2 / $10 per 1M tokens through Nov 30, then $4 / $20
  Google’s new frontier model for long-horizon agent tasks; intro pricing ends Dec 1 — watch agent builder model pickers and Gateway credit burn. Source
• 2026-10-13
  n8n adds Gemini 4 Argon for Agents, Assistant, and MCP workflows
  One of the first builder platforms with Argon at launch; Cloud users can run it via Gateway credits without a separate Google key. Source

2. Price check: cheapest paid plans right now

• Make: $9/mo (Core, from 10k credits; Make compare page) (≈ $9/mo)
• Relevance AI: $19/mo billed annually (Pro; $29 monthly) (≈ $19/mo)
• Zapier: $19.99/mo (Professional); Agents Pro $33.33/mo billed annually (≈ $20/mo)
• Activepieces: $20/mo flat (Plus) (≈ $20/mo)
• n8n: €20/mo (Starter, billed annually) (≈ $22/mo)

Approximate USD/month; €1 = $1.1242 (open.er-api.com daily reference rate (EUR base), retrieved Oct 17, 2026).

3. Free plans worth knowing

• n8n: Self-hosted Community Edition free; Cloud has a free trial (1,000 executions, no card)
• Make: Yes: 1,000 credits/month, 2 active scenarios, 15-min interval
• Zapier: Yes: Zapier Free plan; Agents free tier 400 activities/month
• Activepieces: Yes, free forever (no card); self-host option
• Botpress: Yes: 100 conversations, no overages

4. From our hands-on tests

We've tested 3 of 10 builders hands-on so far (n8n, Make, and the AI step in Activepieces). See results.