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Artificial Analysis Launches Endpoint Accuracy Index for Open Models

Artificial Analysis announces the Endpoint Accuracy Index, which measures how much accuracy serverless API endpoints preserve for open weights models. Initial coverage includes GLM-5.2, gpt-oss-120b, and DeepSeek V4 Pro, with Kimi K3 coming soon. The index evaluates endpoints on tool calling, scientific reasoning, and long context recall, comparing results against a self-hosted reference deployment. Key findings show that restrictive output limits and tool call handling can significantly reduce accuracy. Results are live on Artificial Analysis's website.