Can generating three strings of numbers reveal which model you’re using?

Technology and Creation AI
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:green_circle:Introduction: Identify a model in just a few minutes

• Designed specifically to find out which model is actually running behind the third-party API you’re calling. It has the model under test complete three sets of special long-integer generation tasks, then compares the “model fingerprint” in the output against its built-in database to determine which model family and specific version it most closely resembles. The fingerprint database currently covers 17 GPT and Claude series models. It supports direct manual testing on the web, local deployment, and automated API detection. It also includes ModelTrace Guard, which continuously checks during Codex operations to see whether the model has been quietly switched. Super useful for people who frequently use proxy APIs and third-party model platforms. Completely free and open source; manual testing on the web is also free.

:desktop_computer:[Project page]

:link:[Online detection]

:+1:Open the notifications and leave a like — Treehouse updates always come with goodies.

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Badass Plus

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Useful :xhj006:

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Awesome!

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666

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Awesome

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I wonder if detection for modeloc could be added :xhj001:

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You old fool, DeepSeek-V4.1-Flash was rated as GPT-5.6-Sol in the test. When you get down to it, it’s all just for fun—yet you actually believe it?

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What’s the probability that this was written by GPT? Is it 99.99%?

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half

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So basically, it means it can’t be determined, right?

Maybe this one didn’t collect data from DeepSeek, so it can only provide the highest probability…