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Halcyon Labs

Revenue 2.2×

AI

Lisbon

Cohort 07

Halcyon Labs

Testing tools that tell product teams when a model change makes their AI features worse.

Founded by Nikhil Rao and Beatriz Lopes

Halcyon Labs

Week 0 against week 16.

Monthly revenue posted to the cohort board at the first and last Friday review.

Week 0
$22k
Week 16
$48k

2.2×

Growth in 16 weeks

$5M seed

Raised after Demo Day

Cohort 07

Autumn 2025

What changed.

Week 0

Halcyon arrived with strong usage among engineers and no budget owner at customers.

During the program

Pricing moved from usage-based to a platform fee sold to heads of product.

Week 16

Revenue grew 2.2× and average contract value tripled.

Applications close 30 November

Your numbers could be next.

Twelve places in Cohort 09. You’ll hear back within ten days, with notes either way.

Applications close 30 November

Your numbers could be next.

Twelve places in Cohort 09. You’ll hear back within ten days, with notes either way.

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