GPT-5.4 vs OpenAI o3
A direct API-pricing comparison between GPT-5.4 and OpenAI o3. Below: every cost dimension side by side, then the bottom line for a typical workload.
Bottom line
For a typical 5K-in / 1K-out request, OpenAI o3 is the cheaper choice at $0.018 per call — 1.5× less than GPT-5.4 at $0.028.
| GPT-5.4OpenAI | OpenAI o3OpenAI | |
|---|---|---|
| Input / 1M tokens | $2.50 | $2.00 |
| Output / 1M tokens | $15.00 | $8.00 |
| Cached input / 1M | — | — |
| Context window | 400K | 200K |
| Provider | OpenAI | OpenAI |
Green = cheaper on that line. Prices are estimates from public pricing pages; verify against OpenAI and OpenAI before relying on them.
Which is cheaper, GPT-5.4 or OpenAI o3?
On output tokens — usually the dominant cost — GPT-5.4 charges $15.00 per million versus $8.00 for OpenAI o3. The right pick depends on your input/output ratio and how much you can serve from cache. Use the calculator to model your exact traffic.