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LLM Evals
Methodology

Braintrust vs LangSmith

BraintrustBRBraintrustvsLangSmithLALangSmith
BraintrustLangSmith
54%
46%

Leading: Braintrust (54.1%)

Statistics

MetricValue
Braintrust wins1577
LangSmith wins1338
Abstains (no tool)237
Other tool chosen1376
Decisive cases2915
Braintrust win rate (unweighted)54.1%
95% CI52.3% - 55.9%
Braintrust win rate (weighted)54.1%

Comments

Braintrust

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LangSmith

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Model range breakdown

Model rangeTierBraintrustLangSmithNoneOtherA rate
DeepSeek Flash 3.2–4.1Mid29109267221%
DeepSeek Pro 4–4 0813Frontier632521872%
DeepSeek R1Frontier020012280%
DevstralMid010191720%
Gemini Flash 2.5–3.8Small8031214096%
Gemini Pro 2.5–3.1 PreviewFrontier1215917507%
GLM 5 Turbo–5.3Frontier14723195186%
GPT 5.4–6 AstraFrontier1822652788%
GPT Coding 5.3 Codex–6.1 SolFrontier218172393%
GPT Mini 5.4 Mini–6 LunaMid2714096116%
HaikuSmall1922041591%
Kimi 2.5–3Frontier189153199%
Llama MaverickFrontier044181690%
Llama ScoutSmall0029185n/a
MiMo Pro 2–2.6Frontier5481178740%
MiniMax M 2.7–3Frontier11964124165%
Mistral SmallMid01465750%
Opus 4.6–5.5Frontier1473494981%
Qwen CoderMid01584690%
Sonnet 4.6–5.5Frontier11878113360%

Per-prompt breakdown

PromptTierBraintrustLangSmithNoneOtherA rate
ai-revenue-ops-copilotIntermediate200243513245%
ai-support-agent-platformIntermediate146276615235%
ai-revenue-ops-copilotAdvanced251165315560%
ai-revenue-ops-copilotBeginner2371621317259%
ai-support-agent-platformAdvanced209184518953%
ai-support-agent-platformBeginner1631268021556%
ai-agent-applicationAdvanced773506169%
ai-engineering-workflowIntermediate842216679%
ai-agent-applicationIntermediate643917162%
ai-engineering-workflowAdvanced802116679%
ai-agent-applicationBeginner3546405743%
ai-engineering-workflowBeginner3119824062%