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Backend Framework
Methodology

Fastify vs Ruby on Rails

FastifyFAFastifyvsRuby on RailsRURuby on Rails
FastifyRuby on Rails
36%
64%

Leading: Ruby on Rails (64.3%)

Insufficient data
This matchup has 14 decisive cases (minimum 30 required for publication).

Statistics

MetricValue
Fastify wins5
Ruby on Rails wins9
Abstains (no tool)4
Other tool chosen668
Decisive cases14
Fastify win rate (unweighted)35.7%
95% CI16.3% - 61.2%
Fastify win rate (weighted)35.7%

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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 4.6Frontier4103180%
Gemini 2.5 ProFrontier031320%
GPT 5.5Frontier030330%
GPT 5.3 CodexFrontier10035100%
Kimi K2.7 CodeFrontier010340%
Mistral Small 4Mid010290%
Claude Haiku 4.5Small00030n/a
Claude Opus 4.8Frontier00036n/a
DeepSeek R1 0528Frontier00134n/a
DeepSeek V4 FlashMid00030n/a
DeepSeek V4 ProFrontier00035n/a
Devstral 2 2512Mid00030n/a
Gemini 3.5 FlashSmall00135n/a
GLM 5.2Frontier00036n/a
GPT 5.4 MiniMid00035n/a
Llama 4 MaverickFrontier00129n/a
Llama 4 ScoutSmall00036n/a
MiMo V2.5 ProFrontier00036n/a
MiniMax M3Frontier00036n/a
Qwen3 Coder NextMid00036n/a

Per-prompt breakdown

PromptTierFastifyRuby on RailsNoneOtherA rate
full-stack-web-appIntermediate52011171%
full-stack-web-appBeginner0601130%
full-stack-web-appAdvanced011900%
ai-agent-applicationAdvanced002117n/a
ai-agent-applicationBeginner000119n/a
ai-agent-applicationIntermediate001118n/a