Try the Frontier Models Before You Pay for Them
Deciding which frontier model to pay for usually means paying for one first. GitLab's Duo Agent Platform offers a way round that: a 30-day GitLab Ultimate trial, no credit card, whose agentic coding chat includes a model picker. According to the guide, that picker lists GPT-6 Astra from OpenAI and Claude Fable 5.1 and Claude Haiku 4.5 from Anthropic, alongside other top models.
What You're Actually Getting
This is agentic coding chat that works inside your own repository — plan, build and edit code with whichever model you pick. It isn't an open chat playground, and it isn't a permanent free tier: it's a time-boxed trial with a credit allowance. Treat it as a way to compare models on your real code before committing money, which is exactly what it's good for.
Getting It Running
Go to GitLab's free-trial page, start the Ultimate trial (a company name and country, no card), open Duo Agentic Chat, pick a model and start building. The trial and its credits activate immediately.
A Note on the Hype
The guide is upfront that the social-media claims doing the rounds — whole sites or games built in a minute — are hype, and that results will vary. The genuinely useful part is simpler: a no-cost way to put several frontier models against the same codebase and see which one you'd actually pay for.
What's in the Guide
The models in the picker, the four-step setup, what the trial does and doesn't include, and the link to start.
The full field guide is in the PDF.
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