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Backend Framework
Methodology

Flask vs Fastify

FlaskFLFlaskvsFastifyFAFastify
FlaskFastify
29%
71%

Leading: Fastify (71.4%)

Insufficient data
This matchup has 7 decisive cases (minimum 30 required for publication).

Statistics

MetricValue
Flask wins2
Fastify wins5
Abstains (no tool)4
Other tool chosen675
Decisive cases7
Flask win rate (unweighted)28.6%
95% CI8.2% - 64.1%
Flask win rate (weighted)28.6%

Comments

Flask

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Fastify

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Per-model breakdown

ModelTierFlaskFastifyNoneOtherA rate
Claude Sonnet 4.6Frontier040320%
Devstral 2 2512Mid10029100%
Llama 4 ScoutSmall10035100%
GPT 5.3 CodexFrontier010350%
Claude Haiku 4.5Small00030n/a
Claude Opus 4.8Frontier00036n/a
DeepSeek R1 0528Frontier00134n/a
DeepSeek V4 FlashMid00030n/a
DeepSeek V4 ProFrontier00035n/a
Gemini 2.5 ProFrontier00135n/a
Gemini 3.5 FlashSmall00135n/a
GLM 5.2Frontier00036n/a
GPT 5.4 MiniMid00035n/a
GPT 5.5Frontier00036n/a
Kimi K2.7 CodeFrontier00035n/a
Llama 4 MaverickFrontier00129n/a
MiMo V2.5 ProFrontier00036n/a
MiniMax M3Frontier00036n/a
Mistral Small 4Mid00030n/a
Qwen3 Coder NextMid00036n/a

Per-prompt breakdown

PromptTierFlaskFastifyNoneOtherA rate
full-stack-web-appIntermediate0501130%
ai-agent-applicationIntermediate101117100%
full-stack-web-appBeginner100118100%
ai-agent-applicationAdvanced002117n/a
ai-agent-applicationBeginner000119n/a
full-stack-web-appAdvanced00191n/a