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Meta’s new AI model tests raise concerns over fairness and transparency

Meta’s AI model Maverick ranked high on LM Arena, but developers don’t get the same version tested, raising concerns over fairness.

Meta’s new AI model, Maverick, made headlines after it climbed to the second spot on LM Arena, a popular AI performance leaderboard where human reviewers compare and rate responses from various models. At first glance, this seems like a major success. But if you look closer, it’s not as clear-cut as it seems.

The version of Maverick that earned high marks in the LM Arena rankings isn’t the same version that developers like you can access today. This has raised questions across the AI community about fairness, transparency, and how benchmark results are presented.

LM Arena model is not the one you get

Meta clearly stated in its announcement that the Maverick model submitted to LM Arena was an “experimental chat version.” The company goes further on the official Llama website, revealing that the version tested was “Llama 4 Maverick optimised for conversationality.”

In other words, Meta fine-tuned a special version of the model to perform better in chat-style interactions—something that naturally gives it an edge in a test like LM Arena, where human reviewers prefer smooth, engaging conversations.

But here’s the issue: this version isn’t available to developers. The model you can download and use is a more standard, general-purpose version of Maverick—often called the “vanilla” variant. That means you’re not getting the same results that earned Meta a top spot on the leaderboard.

Why this matters to developers

Why does this difference matter? After all, companies often tweak their products for marketing purposes. But when it comes to AI models, benchmarks like LM Arena help developers, researchers, and businesses decide which model to use.

If a company releases one version of a model for testing but provides a less capable version to the public, it skews the expectations. You could end up basing your development plans on results that the model you get can’t match.

Some researchers on X (formerly Twitter) have even pointed out that the public version of Maverick behaves noticeably differently than the LM Arena one. It doesn’t use emojis as often, and its answers tend to be shorter and less conversational. These are clear signs that the models are not the same.

Benchmark results should reflect real-world use

The bigger concern here is about how benchmarks are used. Many in the AI field already agree that LM Arena isn’t perfect. It’s a valuable tool, but it doesn’t always provide a full or fair picture of what a model can do in every situation.

Most companies have avoided tuning their models precisely to score better on LM Arena. Or if they have done so, they haven’t made it public. Meta’s decision to test a customised version and promote its ranking without making the same model widely available sets a worrying precedent.

Benchmarks should help you understand a model’s strengths and weaknesses across various tasks—not just how well it performs in one specific setup. When companies tailor their models to game these benchmarks, it can lead to confusion and disappointment.

If you plan to use Maverick, remember that the version Meta showcased isn’t precisely what you’ll get. Testing models and focusing on specific use cases is important rather than relying too heavily on leaderboard rankings.

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