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LLM Observability
Methodology

Langfuse vs LangSmith

LangfuseLALangfusevsLangSmithLALangSmith
LangfuseLangSmith
36%
64%

Leading: LangSmith (63.9%)

Statistics

MetricValue
Langfuse wins1365
LangSmith wins2417
Abstains (no tool)159
Other tool chosen648
Decisive cases3782
Langfuse win rate (unweighted)36.1%
95% CI34.6% - 37.6%
Langfuse win rate (weighted)36.1%

Comments

Langfuse

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LangSmith

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Model range breakdown

Model rangeTierLangfuseLangSmithNoneOtherA rate
DeepSeek Flash 3.2–4.1Mid481814621%
DeepSeek Pro 4–4 0813Frontier37681235%
DeepSeek R1Frontier12142230%
DevstralMid039291410%
Gemini Flash 2.5–3.8Small2581413024%
Gemini Pro 2.5–3.1 PreviewFrontier9217954%
GLM 5 Turbo–5.3Frontier541860023%
GPT 5.4–6 AstraFrontier176585175%
GPT Coding 5.3 Codex–6.1 SolFrontier208302087%
GPT Mini 5.4 Mini–6 LunaMid651656428%
HaikuSmall1535932172%
Kimi 2.5–3Frontier1061154148%
Llama MaverickFrontier23130176815%
Llama ScoutSmall37036149100%
MiMo Pro 2–2.6Frontier19207868%
MiniMax M 2.7–3Frontier5715352227%
Mistral SmallMid111814396%
Opus 4.6–5.5Frontier167649072%
Qwen CoderMid9111722944%
Sonnet 4.6–5.5Frontier781529134%

Per-prompt breakdown

PromptTierLangfuseLangSmithNoneOtherA rate
ai-support-agent-platformIntermediate11739118523%
ai-revenue-ops-copilotIntermediate13636217927%
ai-support-agent-platformBeginner227263178246%
ai-revenue-ops-copilotAdvanced14434139730%
ai-support-agent-platformAdvanced178303111037%
ai-revenue-ops-copilotBeginner155315349133%
ai-agent-applicationAdvanced689401342%
ai-agent-applicationIntermediate4511511428%
ai-engineering-workflowIntermediate1005002767%
ai-agent-applicationBeginner3711027425%
ai-engineering-workflowAdvanced914803465%
ai-engineering-workflowBeginner6725741273%