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Backend Framework
Methodology

Fastify vs Ruby on Rails

FastifyFAFastifyvsRuby on RailsRURuby on Rails
FastifyRuby on Rails
38%
62%

Leading: Ruby on Rails (62.5%)

Insufficient data
This matchup has 16 decisive cases (minimum 30 required for publication).

Statistics

MetricValue
Fastify wins6
Ruby on Rails wins10
Abstains (no tool)4
Other tool chosen775
Decisive cases16
Fastify win rate (unweighted)37.5%
95% CI18.5% - 61.4%
Fastify win rate (weighted)37.5%

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Fastify

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Ruby on Rails

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Per-model breakdown

ModelTierFastifyRuby on RailsNoneOtherA rate
Claude Sonnet 4.6Frontier5103683%
Gemini 2.5 ProFrontier031380%
GPT 5.5Frontier030390%
GPT 5.3 CodexFrontier10041100%
DeepSeek R1 0528Frontier011390%
Kimi K2.7 CodeFrontier010400%
Mistral Small 4Mid010340%
Claude Haiku 4.5Small00035n/a
Claude Opus 4.8Frontier00042n/a
DeepSeek V4 FlashMid00034n/a
DeepSeek V4 ProFrontier00041n/a
Devstral 2 2512Mid00030n/a
Gemini 3.5 FlashSmall00141n/a
GLM 5.2Frontier00042n/a
GPT 5.4 MiniMid00041n/a
Llama 4 MaverickFrontier00134n/a
Llama 4 ScoutSmall00042n/a
MiMo V2.5 ProFrontier00042n/a
MiniMax M3Frontier00042n/a
Qwen3 Coder NextMid00042n/a

Per-prompt breakdown

PromptTierFastifyRuby on RailsNoneOtherA rate
full-stack-web-appIntermediate62012875%
full-stack-web-appBeginner0601320%
full-stack-web-appAdvanced0211040%
ai-agent-applicationAdvanced002136n/a
ai-agent-applicationBeginner000138n/a
ai-agent-applicationIntermediate001137n/a