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skmtc/openapi-codegen-benchmarks: OpenAPI code generation performance comparison between Orval, Kubb, Hey API and Skmtc · GitHub

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OpenAPI to Zod Generation Benchmarks

Performance comparison of popular OpenAPI-to-Zod code generation tools using the GitHub REST API v3 OpenAPI specification (11.1MB JSON file).

🏆 Key Findings

  • Fastest: skmtc generates schemas in 0.51s
  • Speedup: skmtc is 23.3x faster than openapi-ts and 9.5x faster than orval
  • Most Consistent: skmtc has the lowest standard deviation (0.01s)

Results Summary

Rank Framework Mean Time Min Time Max Time Std Dev Relative Speed
🥇 #1 skmtc 0.512s 0.50s 0.533s 0.010s 1.0x (baseline)
🥈 #2 orval 4.853s 4.72s 5.155s 0.124s 9.5x slower
🥉 #3 kubb 7.632s 7.38s 7.981s 0.182s 14.9x slower
#4 openapi-ts 11.949s 11.70s 12.470s 0.262s 23.3x slower

Performance Visualization

🚀 Generation Time Comparison (lower is better)

skmtc-zod       0.51s   ██▎ 1.0x
orval-zod       4.85s   ████████████████████▎ 9.5x
kubb-zod        7.63s   ███████████████████████████████▉ 14.9x
openapi-ts-zod  11.95s  █████████████████████████████████████████████████▉ 23.3x
                        ◺ 0.00                                     12.00 ◿

Chart generated using wunderbar with partial block characters for precise visualization

Test Environment

  • Test Specification: GitHub REST API v3 OpenAPI spec (11.1MB JSON)
  • Iterations: 10 runs per tool with 1 warmup run
  • Last Updated: 2025-11-10

How to Run

Run the benchmarks yourself:

./benchmark.sh

The script automatically:

  • Runs benchmarks with hyperfine
  • Generates performance charts using wunderbar
  • Updates README.md with latest results and visualizations

Prerequisites:

  • Node.js v16+ - Runtime for chart generation
  • hyperfine - Command-line benchmarking tool
  • jq - JSON processor
  • pnpm - Package manager (for Node.js tools)
  • Deno - Runtime (for skmtc)

About the Tools

Tool Description Links
skmtc Deno-native OpenAPI code generator with Zod support GitHub • JSR
Orval OpenAPI client and schema generator GitHub • Docs
Kubb Plugin-based OpenAPI code generator GitHub • Docs
openapi-ts TypeScript client and schema generator GitHub • Docs

All tools generate Zod v4 schemas from the same OpenAPI specification.

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OpenAPI code generation performance comparison between Orval, Kubb, Hey API and Skmtc

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