Pricing comparison
GPT-5.4 vs o4-mini
Per-token pricing, full-workload cost ladders, and monthly volume projections. Numbers sourced directly from each provider's rate card.
OpenAI
GPT-5.4
- Input
- $2.50 / 1M
- Output
- $15.00 / 1M
- Cached input
- $0.250 / 1M
- Context
- 1.1M
- Max output
- 128K
OpenAI
o4-mini
- Input
- $1.10 / 1M
- Output
- $4.40 / 1M
- Cached input
- $0.275 / 1M
- Context
- 200K
- Max output
- 100K
Cost per request
Four common workload shapes, input tokens and a 1:2 output ratio (a standard chat/completion pattern). Long-context surcharges apply automatically where the provider charges them.
| Scenario | Tokens (in / out) | GPT-5.4 | o4-mini | Winner |
|---|---|---|---|---|
| Short prompt | 100 / 200 | $0.0033 | $0.0010 | o4-mini |
| Typical request | 1,000 / 2,000 | $0.0325 | $0.0099 | o4-mini |
| Long document | 10,000 / 5,000 | $0.1000 | $0.0330 | o4-mini |
| Large prompt | 100,000 / 10,000 | $0.4000 | $0.1540 | o4-mini |
Monthly bill at scale
Projected monthly cost at typical request volume, assuming the "typical request" shape above (1k in, 2k out).
| Traffic | Req / month | GPT-5.4 | o4-mini | Delta |
|---|---|---|---|---|
| Small SaaS | 1,000 | $32.50 | $9.90 | o4-mini -$22.60 |
| Growing product | 10,000 | $325.00 | $99.00 | o4-mini -$226.00 |
| Heavy usage | 100,000 | $3,250 | $990.00 | o4-mini -$2,260 |
Which should you use?
For the typical chat-shape request (~1k input, 2k output), o4-mini comes out 228% cheaper. If you're picking one as the default, that's usually the right choice on cost alone.
o4-mini wins on both sides of the bill - cheaper input and cheaper output. If the quality gap is in your favour, there's no cost argument for the other side.
Context window differs: GPT-5.4 holds 1.1M of input vs 200K on the other side. If you regularly push past the smaller ceiling, the comparison ends there.
Live cost calculator
Type in any token counts - both prices update instantly. Uses base input/output rates (no cache discount, no long-context tier).
GPT-5.4
$0.0100
per request
o4-mini
$0.0033
per request
Try both in the estimator →
Drop your actual prompt in, tokens are counted with the provider's own tokenizer, and the dollar number matches what lands on your invoice.
Frequently asked
- Which is cheaper, GPT-5.4 or o4-mini?
- On a typical 1,000-input / 2,000-output request, o4-mini costs ~$0.0099 vs ~$0.0325 on GPT-5.4. Input or output rates can flip the answer for very lopsided workloads - see the cost ladder above.
- What's the difference in per-token pricing?
- GPT-5.4 charges $2.50 per 1M input tokens and $15.00 per 1M output tokens. o4-mini charges $1.10 / $4.40 per 1M.
- Which has the bigger context window?
- GPT-5.4 is larger (1.1M) vs 200K on the other.
- Is there a cached-input discount on either?
- GPT-5.4 caches at $0.250 per 1M (90% off). o4-mini caches at $0.275 per 1M (75% off). Workloads with repeated static prefixes see the biggest savings.
- How fresh is this comparison?
- GPT-5.4 was re-verified on 2026-04-06 and o4-mini on 2026-04-06 against each provider's published rate card. Calcis re-checks every row on a rolling schedule and re-deploys when a provider changes pricing.
GPT-5.4 verified 2026-04-06 · o4-mini verified 2026-04-06. Rate cards at OpenAI and OpenAI.