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LLM Observability
Methodology

Langfuse vs LangSmith

LangfuseLALangfusevsLangSmithLALangSmith
LangfuseLangSmith
34%
66%

Leading: LangSmith (66.0%)

Statistics

MetricValue
Langfuse wins1119
LangSmith wins2170
Abstains (no tool)129
Other tool chosen587
Decisive cases3289
Langfuse win rate (unweighted)34.0%
95% CI32.4% - 35.7%
Langfuse win rate (weighted)34.0%

Comments

Langfuse

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LangSmith

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Per-model breakdown

ModelTierLangfuseLangSmithNoneOtherA rate
GPT 5.3 CodexFrontier187230089%
Claude Sonnet 4.6Frontier541497027%
GPT 5.4 MiniMid451565422%
Gemini 2.5 ProFrontier7192654%
DeepSeek R1 0528Frontier01882200%
Claude Haiku 4.5Small1325431771%
Qwen3 Coder NextMid7710322743%
Mistral Small 4Mid101593336%
Llama 4 MaverickFrontier19113146314%
GPT 5.4Frontier114120090%
Claude Opus 4.6Frontier106200084%
GLM 5 TurboFrontier121140010%
DeepSeek V3.2Mid7114056%
MiMo V2 ProFrontier1119241%
Kimi K2.5Frontier48624044%
MiniMax M2.7Frontier11003201%
GLM 5.2Frontier33510039%
MiniMax M3Frontier47351157%
Kimi K2.7 CodeFrontier40420149%
DeepSeek V4 ProFrontier16651220%
GPT 5.5Frontier43373154%
DeepSeek V4 FlashMid28514035%
Gemini 3.5 FlashSmall9701411%
Claude Opus 4.8Frontier36417047%
MiMo V2.5 ProFrontier10666213%
Llama 4 ScoutSmall36029133100%
Devstral 2 2512Mid030251250%
Gemini 2.5 FlashSmall14112020%

Per-prompt breakdown

PromptTierLangfuseLangSmithNoneOtherA rate
ai-support-agent-platformIntermediate10235517722%
ai-revenue-ops-copilotIntermediate11533017626%
ai-support-agent-platformBeginner199241177445%
ai-revenue-ops-copilotAdvanced12331328928%
ai-support-agent-platformAdvanced155275110236%
ai-revenue-ops-copilotBeginner137284308533%
ai-agent-applicationAdvanced477901037%
ai-agent-applicationIntermediate269811221%
ai-engineering-workflowIntermediate714302362%
ai-agent-applicationBeginner258921322%
ai-engineering-workflowAdvanced684002763%
ai-engineering-workflowBeginner512355969%