Kosa8 vs Upstash

Sandbox Benchmark Comparison · Updated November 13, 2026

Kosa8
Faster in
1of 1 benchmark
#33 of 33 in Sandbox Provider Rating
vs
Upstash
Faster in
0of 1 benchmark
#9 of 33 in Sandbox Provider Rating

Kosa8 was faster in the only sandbox benchmark with a speed verdict.

Head to head

  • Burst TTI
    Time to interactive · lower is better
    Kosa8 faster1.30x
    Kosa8
    1.83s
    Upstash
    2.37s
  • DAX
    Total workload time · lower is better
    No verdict
    Kosa8
    —
    Upstash
    54.22s

Burst TTI

November 13, 2026
Full leaderboard

Kosa8

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

Upstash

100% success
Median
2.37s
p95
4.45s
p99
4.51s
Upstash Burst TTI results

DAX

November 13, 2026
Full leaderboard

Kosa8

0% success

No measured time in this run.

Kosa8 DAX results

Upstash

100% success
Median
54.22s
Upstash DAX results
Work at Kosa8 or Upstash? 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

Have another question? Email us.

Kosa8 was faster in the only sandbox benchmark with a speed verdict. In Burst TTI (November 13, 2026), Kosa8 had a median time to interactive of 1.83s versus 2.37s for Upstash, 1.30x 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%, Upstash 100%; DAX: Kosa8 0%, Upstash 100%. DAX has no speed verdict because Kosa8 completed fewer than half of its runs; Upstash's median total workload time was 54.22s.

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