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LLM Evals
Methodology

Vellum vs MLflow

VEVellumvsMLMLflow
VellumMLflow
44%
56%

Leading: MLflow (55.8%)

Statistics

MetricValue
Vellum wins19
MLflow wins24
Abstains (no tool)183
Other tool chosen3596
Decisive cases43
Vellum win rate (unweighted)44.2%
95% CI30.4% - 58.9%
Vellum win rate (weighted)44.2%

Comments

Vellum

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MLflow

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Per-model breakdown

ModelTierVellumMLflowNoneOtherA rate
Llama 4 ScoutSmall024201410%
Devstral 2 2512Mid18014145100%
MiMo V2 ProFrontier108123100%
Claude Haiku 4.5Small003191n/a
Claude Opus 4.6Frontier000132n/a
Claude Opus 4.8Frontier00665n/a
Claude Sonnet 4.6Frontier006198n/a
DeepSeek R1 0528Frontier009195n/a
DeepSeek V3.2Mid0022106n/a
DeepSeek V4 FlashMid00467n/a
DeepSeek V4 ProFrontier00270n/a
Gemini 2.5 FlashSmall001126n/a
Gemini 2.5 ProFrontier0011191n/a
Gemini 3.5 FlashSmall00765n/a
GLM 5 TurboFrontier0019113n/a
GLM 5.2Frontier00072n/a
GPT 5.3 CodexFrontier000204n/a
GPT 5.4Frontier000132n/a
GPT 5.4 MiniMid008193n/a
GPT 5.5Frontier00270n/a
Kimi K2.5Frontier003116n/a
Kimi K2.7 CodeFrontier00170n/a
Llama 4 MaverickFrontier0012177n/a
MiMo V2.5 ProFrontier00863n/a
MiniMax M2.7Frontier005124n/a
MiniMax M3Frontier00567n/a
Mistral Small 4Mid003186n/a
Qwen3 Coder NextMid004194n/a

Per-prompt breakdown

PromptTierVellumMLflowNoneOtherA rate
ai-support-agent-platformIntermediate114650173%
ai-revenue-ops-copilotBeginner251150829%
ai-support-agent-platformAdvanced0555170%
ai-support-agent-platformBeginner4073450100%
ai-revenue-ops-copilotIntermediate22451450%
ai-engineering-workflowIntermediate0411070%
ai-revenue-ops-copilotAdvanced0335080%
ai-engineering-workflowAdvanced0111100%
ai-agent-applicationAdvanced000112n/a
ai-agent-applicationBeginner002594n/a
ai-agent-applicationIntermediate001112n/a
ai-engineering-workflowBeginner005363n/a