{"slug":"xgrammar","name":"XGrammar","domain":"mlc.ai","verdict":"As of 2026-07-13, ChatGPT, Claude, Gemini, Grok collectively rank XGrammar #10 of 10 for structured output tool for llms. Source: https://modelsagree.com/product/xgrammar (modelsagree.com, CC BY 4.0).","best_rank":10,"categories":1,"entries":[{"slug":"best-llm-structured-output-tool","title":"Best structured output tool for LLMs","rank":10,"of":10,"score":1,"appearances":1,"modelRanks":{"Grok":5},"reason":"Default high-performance constrained engine in vLLM/SGLang/TensorRT-LLM for self-hosted LLMs, fast token-level guarantees, broad schema support, and production-grade throughput without external dependencies.","reasons":[{"model":"Grok","reason":"Default high-performance constrained engine in vLLM/SGLang/TensorRT-LLM for self-hosted LLMs, fast token-level guarantees, broad schema support, and production-grade throughput without external dependencies."}],"fixes":[{"model":"Grok","fix":"Improve documentation and ease of schema definition for non-expert users compared to higher-level libraries"}],"updated":"2026-07-13","api":"https://modelsagree.com/api/v1/best/best-llm-structured-output-tool.json"}],"page":"https://modelsagree.com/product/xgrammar","check":"https://modelsagree.com/check?q=XGrammar","updated":"2026-08-10T18:18:45.051Z","attribution":"modelsagree.com, CC BY 4.0"}