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A recent study by Tencent showed that Elixir had the highest completion rate across models when compared among 20 different programming languages. When combining the results of all 30+ evaluated models, 97.5% of Elixir problems were solved by at least one model, the highest among all languages:
Even when evaluating models individually, Elixir was the top scorer for most models in both reasoning and non-reasoning modes. For example, Claude Opus 4 scored 80.3% on Elixir, followed by C# at 74.9% and Kotlin at 72.5%, with similar results in non-reasoning mode and for Sonnet.
The article has been getting some coverage lately, Theo recently published a video on the topic, so I thought I would add my own take on the possible reasons why Elixir does so well. This article will have two parts, exploring language features and then tooling.
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