Kosa8 vs Vercel

Sandbox Benchmark Comparison · Updated November 13, 2026

Kosa8
Faster in
0of 1 benchmark
#33 of 33 in Sandbox Provider Rating
vs
Vercel
Faster in
1of 1 benchmark
#12 of 33 in Sandbox Provider Rating

Vercel was faster in the only sandbox benchmark with a speed verdict.

Head to head

  • Burst TTI
    Time to interactive · lower is better
    Vercel faster3.51x
    Kosa8
    1.83s
    Vercel
    521ms
  • DAX
    Total workload time · lower is better
    No verdict
    Kosa8
    —
    Vercel
    72.27s

Burst TTI

November 13, 2026
Full leaderboard

Kosa8

100% success
Median
1.83s
p95
2.50s
p99
3.14s
Kosa8 Burst TTI results

Vercel

100% success
Median
521ms
p95
1.19s
p99
1.75s
Vercel Burst TTI results

DAX

November 13, 2026
Full leaderboard

Kosa8

0% success

No measured time in this run.

Kosa8 DAX results

Vercel

100% success
Median
72.27s
Vercel DAX results
Work at Kosa8 or Vercel? See where you stand every day, with full run logs, not just on benchmark Friday.Get stealth benchmarks →

Methodology

  • One workload, every provider. The same script, payload, and model hit every provider, addressed the way its own API expects. Nobody gets a tuned or special path.
  • Repeated on a schedule. Every suite runs many iterations per provider, automated on a recurring schedule, so results reflect steady state rather than one lucky request.
  • Raw results published. Every run is committed as JSON to the public benchmarks repo, next to the code that produced it. Nothing is cherry-picked or held back.
  • How this comparison is built. Each benchmark compares the two providers' medians; results within 5% count as roughly even. A comparison is published when both providers have at least one successful run in the same benchmark from the last 30 days. A benchmark only gets a verdict when both providers completed at least 50% of its runs. If a provider’s latest run of a benchmark failed, its most recent successful run from that window is used instead.
Read the full methodology →Raw results on GitHub ↗

Frequently asked questions

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Vercel was faster in the only sandbox benchmark with a speed verdict. In Burst TTI (November 13, 2026), Vercel had a median time to interactive of 521ms versus 1.83s for Kosa8, 3.51x faster.

Both providers have results in 2 sandbox benchmarks: Burst TTI and DAX. 1 of them has a speed verdict.

Success rates in the latest runs: Burst TTI: Kosa8 100%, Vercel 100%; DAX: Kosa8 0%, Vercel 100%. DAX has no speed verdict because Kosa8 completed fewer than half of its runs; Vercel's median total workload time was 72.27s.

Burst TTI and DAX results are from November 13, 2026.