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LLM Observability
Methodology

Langfuse vs LangSmith

LangfuseLALangfusevsLangSmithLALangSmith
LangfuseLangSmith
33%
67%

Leading: LangSmith (66.9%)

Statistics

MetricValue
Langfuse wins723
LangSmith wins1461
Abstains (no tool)57
Other tool chosen469
Decisive cases2184
Langfuse win rate (unweighted)33.1%
95% CI31.2% - 35.1%
Langfuse win rate (weighted)33.1%

Comments

Langfuse

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LangSmith

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Per-model breakdown

ModelTierLangfuseLangSmithNoneOtherA rate
GPT 5.3 CodexFrontier129150090%
Claude Sonnet 4.6Frontier341091024%
GPT 5.4 MiniMid261141319%
Gemini 2.5 ProFrontier1133641%
GPT 5.4Frontier119130090%
Claude Opus 4.6Frontier110220083%
GLM 5 TurboFrontier12120009%
DeepSeek R1 0528Frontier01291140%
Claude Haiku 4.5Small893901370%
DeepSeek V3.2Mid7120056%
Qwen3 Coder NextMid596711647%
MiMo V2 ProFrontier1125241%
Mistral Small 4Mid51201154%
Kimi K2.5Frontier50654043%
MiniMax M2.7Frontier11053211%
Llama 4 MaverickFrontier127925013%
Llama 4 ScoutSmall2501497100%
Devstral 2 2512Mid02217990%
GPT 5.5Frontier750058%
MiniMax M3Frontier750058%
Kimi K2.7 CodeFrontier570042%
GLM 5.2Frontier480033%
Gemini 3.5 FlashSmall2100017%
Claude Opus 4.8Frontier561045%
MiMo V2.5 ProFrontier380127%
DeepSeek V4 FlashMid641060%
DeepSeek V4 ProFrontier371130%
Gemini 2.5 FlashSmall14112620%

Per-prompt breakdown

PromptTierLangfuseLangSmithNoneOtherA rate
ai-support-agent-platformIntermediate8328017223%
ai-revenue-ops-copilotIntermediate9126416726%
ai-support-agent-platformBeginner167183137048%
ai-revenue-ops-copilotAdvanced10224328230%
ai-support-agent-platformAdvanced12621619237%
ai-revenue-ops-copilotBeginner109228297132%
ai-agent-applicationBeginner4133024%
ai-engineering-workflowAdvanced1150469%
ai-agent-applicationAdvanced6100338%
ai-agent-applicationIntermediate3130319%
ai-engineering-workflowIntermediate1310593%
ai-engineering-workflowBeginner857062%