Models / comparison
gpt-5.4 vs gpt-5.5
List prices as of 2026-07-02 — the same table ReasonRank uses to compute verified savings in production.
| Model | Provider | Input / 1M | Output / 1M |
|---|---|---|---|
| gpt-5.4 | openai | $2.5 | $15 |
| gpt-5.5 | openai | $5 | $30 |
At your volume
gpt-5.4
$750.00/mo
cheaper by $750.00/mo at this volume
gpt-5.5
$1,500/mo
List-price math only. Whether the cheaper one holds quality on your workload is the question ReasonRank answers with a statistical gate + production verification.
Price answers “which is cheaper” — not “which is good enough for my workload.” ReasonRank runs both models on your own test cases, applies a statistical non-inferiority gate, and verifies realized savings on your live traffic. Run this comparison on your real workload.