Serge and Adsonomy: two ways to run ChatGPT ads

I build Serge, so read this knowing that. I've tried to describe Adsonomy the way its own site does, and every claim about it below comes from adsonomy.com as I read it on 28 September 2026. If something there has changed, their site is right and this post is out of date.

The short version: we both make software on top of OpenAI's Ads API, and with both you keep your own ad account and pay OpenAI directly for the ads. After that we made opposite bets. Serge puts its effort into the campaign before it runs and keeps every spending decision with you. Adsonomy puts its effort into the account while it runs and lets you hand over more of the day-to-day decisions, step by step.

What each one is

Serge is made by Superstellar LLC in Zug, Switzerland. You give it your website; it builds a business profile you confirm, proposes a campaign (buyer, problem, angle and reasons), writes chat card ads with artwork you can edit, and saves a daily or total budget. You connect your OpenAI account with an API key, the campaign is built paused, and it runs only when you approve the exact amount and currency. After that it shows OpenAI's review verdict and serving status for each ad, daily impressions, clicks and conversions, and lets you edit a built ad, change the cap, pause, or bring an existing campaign from your account into Serge. It doesn't change a bid or a budget on its own.

Adsonomy is built in the Netherlands and calls itself "the ChatGPT Ads manager". Its AI manager, Nomy, syncs the account every 15 to 30 minutes, runs an optimisation hourly, daily or weekly, scouts each week for products and pages without ads, and writes a daily brief of at most 150 words. How much Nomy may do is a policy you choose: suggest only (the default), act on high confidence, or full auto within guardrails. It can apply pause, activate, budget, bid, context hint and daily cap changes itself; new campaigns, new ad groups, creative, conversion settings, objective or bidding changes and archiving always wait for a person. Shadow mode records what it would do without sending anything to OpenAI, and every change goes into a journal you can revert, with a seven-day before-and-after check.

Side by side

Where Adsonomy is the better fit

If you already run campaigns and the work is keeping them tuned, Adsonomy is built for that and Serge isn't. Adsonomy describes scheduling, pacing and CPA or ROAS targets within its optimisation workflow. You can let Nomy act on its own once you trust it, with shadow mode as the rehearsal. Its daily spend cap is checked before every change, whoever or whatever makes it.

Shops are its home ground. It connects Shopify, WooCommerce and BigCommerce directly, reads a Google Shopping or Channable feed from anything else, delivers OpenAI's product feed, sends orders back as server-side conversions, and checks for stock-outs in every optimisation run. Serge supports chat card ads only and has no product feed.

It also covers more ground: advertisers in the EU, the US and Asia, several ad accounts on the bigger plans, and an agency plan with a separate workspace, guardrails and reporting per client. Serge is available only in Switzerland for now and has no agency plan.

Where Serge is the better fit

If you're starting from a website and nothing else, Serge does the part before the first campaign. It reads the site, asks you to confirm the facts, and gives you a reasoned plan and finished ads with artwork, so the first thing you review is a campaign rather than an empty form. A lean team that doesn't have a copywriter or a media buyer gets the brief, the words and the picture in one place.

It suits people who want to decide spend themselves. Nothing in Serge raises a bid or a budget, and running needs a separate approval of the exact amount and currency, checked again against what OpenAI reads back. That's a narrower product than an autopilot, on purpose.

And the price doesn't move with spend. CHF 159 a month is the same at CHF 1,000 of ad spend as at CHF 50,000. On Adsonomy's plans the fee starts once spend passes what the plan includes: Control, for example, is EUR 99 including EUR 10,000, so at EUR 20,000 of monthly spend it comes to EUR 99 plus 1.3% of the extra EUR 10,000, which is EUR 229 before VAT. Below the included spend, Starter and Control cost less than Serge's monthly fee.

Choosing

• Starting ChatGPT ads from your website, and you want to see the reasoning and approve every franc: Serge.
• A shop with a catalogue, or campaigns already live that you want optimised, with the option to delegate: Adsonomy.
• Outside Switzerland: Adsonomy, for now.

If you connect both tools, give each campaign one owner. Two tools making changes to the same campaign, or either of us alongside edits in OpenAI's Ads Manager, can overwrite each other without warning.

If Serge sounds like the right fit, you can build your first campaign here.

Sources

• Adsonomy, homepage and pricing, Autopilot: guardrails and accountability and llms.txt, read 28 September 2026.
• Serge, homepage and pricing, read 28 September 2026.
• OpenAI Ads API reference, Campaigns.