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Comet to test flight calendars and coupons

Mrityunjay Nigam compared Comet and OpenAI's Atlas on a flight-booking task from Bangalore. The brief asked for the cheapest direct one-way option to one of four specified destinations during the week of November 30, with coupon checks and booking-site comparisons before checkout.

FROM THE SOURCE

Original prompt

Shared by the source author. See source notes for context.

book me the cheapest, direct, one-way flight home.

What happened

Comet reached coupon-tested checkout on MakeMyTrip but did not compare all requested sites or submit payment; Atlas required manual continuation.

Reported by Mrityunjay Nigam

How the agent did it

  1. Specify direct routes, destination options, travel week and comparison sites.
  2. Inspect the price-calendar selection and any coupon trials.
  3. Check the actual site coverage and take over any unfinished booking or payment step.

Where a person stepped in

Nigam supplied the constraints and used dummy details for testing; both agents stopped short of a completed booking.

Mrityunjay Nigam compared Comet and OpenAI's Atlas on a flight-booking task from Bangalore. The brief asked for the cheapest direct one-way option to one of four specified destinations during the week of November 30, with coupon checks and booking-site comparisons before checkout.

Comet used only MakeMyTrip despite the request to search across major platforms. Within that site it applied destination filters, read the price calendar and chose a date-and-destination combination. It then used dummy passenger details to reach checkout and tested multiple coupon codes. At the final step it stated that it could not complete payment or booking submission.

Atlas followed prior browsing context to Skyscanner. It examined fares but triggered unwanted fare or price-alert dialogs, struggled with the passenger email field and failed to continue reliably to the third-party booking site. It eventually asked the user to proceed manually.

The outcome was therefore a checkout experiment, not a purchased ticket or a demonstrated lowest fare across the market. No exact final fare is supplied. The useful procedure is to inspect whether the agent actually compared the requested sites, distinguish test passenger data from travel-ready details, and treat a checkout limitation as unfinished work rather than accepting a fake confirmation.

Prompt
Original prompt

Source: medium.com · Mrityunjay Nigam

Frequently asked questions

Did Comet compare every requested booking site?

No. It used only MakeMyTrip despite instructions to check across major platforms.

Were real passenger details used?

The Comet checkout experiment used dummy passenger information.

Did either browser purchase a flight?

No. Comet acknowledged its payment and submission limits, while Atlas asked for manual continuation after navigation failures.

More details

About this account

Comet filtered a fare calendar, selected a combination and tested coupon codes at checkout; Atlas attempted a parallel browser flow.

Firsthand source opened and read. Prompt is a verbatim excerpt of the published original instruction.

Credit: Mrityunjay Nigam

Source published 25 Oct 2025

Source checked 14 Oct 2026

Tools and topics

Perplexity Comet · MakeMyTrip · ChatGPT Atlas · Skyscanner

Flight calendars · Coupon trials · Checkout limits

Editorial completeness: 100/100. Measures documented fields, not agent performance or verified outcomes.