OpenAI · AI model API pricing
How much does GPT-5.4 Mini cost?
Previous-generation small model, still listed — cheap and capable for simple high-volume tasks.
Rate card
| Input tokens | $0.75 / 1M |
| Cached input | $0.075 / 1M |
| Output tokens | $4.5 / 1M |
| Context window | — |
What that means per month
| Workload | Tokens / month | Cost / month |
|---|---|---|
| Prototype | 1M in · 0.3M out | $2.10/mo |
| Small app | 10M in · 3M out | $21/mo |
| Production app | 50M in · 15M out | $105/mo |
| High volume | 200M in · 60M out | $420/mo |
| Heavy platform | 1B in · 300M out | $2,100/mo |
Standard on-demand rates from OpenAI's official pricing page, last checked 2026-07-28. Monthly figures exclude caching and batch discounts. Confirm live pricing before committing.
Where GPT-5.4 Mini sits on price
At the reference month of 10M input and 3M output tokens, GPT-5.4 Mini costs $21, which makes it the 13th cheapest of the 30 models tracked here. That is 12× the price of Qwen-Flash, the cheapest model at this mix ($1.70). Among the 9 budget-tier models it ranks 8th, behind Qwen-Flash at $1.70.
Cache economics
Cached input on GPT-5.4 Mini bills at $0.075 per 1M — 10% of its own input rate, against a 10% median across the models here that publish a cached-read price. 2 models discount cached reads more steeply than this. On the reference month, serving 80% of that input from cache takes the input side of the bill from $7.50 to $2.10, leaving output untouched at $13.5 — which is why a high reuse rate changes the ranking above rather than just shaving the total.
Cache reads only. Writes are billed separately by some providers and are excluded here — see the rate note above for OpenAI's terms. Try it at your own hit rate on the AI cost calculator.
Cheaper alternatives
At a reference workload of 10M input / 3M output tokens a month, these cost less than GPT-5.4 Mini ($21/mo):
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Grok 4.3 $20/mo -
GLM-4.7 $12.6/mo -
Mistral Large 3 $9.50/mo