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Methodology

Flask vs Fastify

FlaskFLFlaskvsFastifyFAFastify
FlaskFastify
25%
75%

Leading: Fastify (75.0%)

Insufficient data
This matchup has 8 decisive cases (minimum 30 required for publication).

Statistics

MetricValue
Flask wins2
Fastify wins6
Abstains (no tool)4
Other tool chosen783
Decisive cases8
Flask win rate (unweighted)25.0%
95% CI7.1% - 59.1%
Flask win rate (weighted)25.0%

Comments

Flask

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Fastify

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Per-model breakdown

ModelTierFlaskFastifyNoneOtherA rate
Claude Sonnet 4.6Frontier050370%
Devstral 2 2512Mid10029100%
Llama 4 ScoutSmall10041100%
GPT 5.3 CodexFrontier010410%
Claude Haiku 4.5Small00035n/a
Claude Opus 4.8Frontier00042n/a
DeepSeek R1 0528Frontier00140n/a
DeepSeek V4 FlashMid00034n/a
DeepSeek V4 ProFrontier00041n/a
Gemini 2.5 ProFrontier00141n/a
Gemini 3.5 FlashSmall00141n/a
GLM 5.2Frontier00042n/a
GPT 5.4 MiniMid00041n/a
GPT 5.5Frontier00042n/a
Kimi K2.7 CodeFrontier00041n/a
Llama 4 MaverickFrontier00134n/a
MiMo V2.5 ProFrontier00042n/a
MiniMax M3Frontier00042n/a
Mistral Small 4Mid00035n/a
Qwen3 Coder NextMid00042n/a

Per-prompt breakdown

PromptTierFlaskFastifyNoneOtherA rate
full-stack-web-appIntermediate0601300%
ai-agent-applicationIntermediate101136100%
full-stack-web-appBeginner100137100%
ai-agent-applicationAdvanced002136n/a
ai-agent-applicationBeginner000138n/a
full-stack-web-appAdvanced001106n/a