GPT-5.4 Mini vs Kimi K2.5
OpenAI against Moonshot AI, costed on the same three workloads. Kimi K2.5 is cheaper on all three workloads.
Monthly bill, side by side
| Workload | GPT-5.4 Mini | Kimi K2.5 | Difference |
|---|---|---|---|
| Support chatbot 2,500 six-turn conversations a day |
$3,324 | $2,417 | $908 (+38%) |
| Document summariser 1,000 single-shot summaries a day |
$383 | $292 | $90.90 (+31%) |
| Coding agent 200 twelve-turn sessions a day |
$2,241 | $1,685 | $556 (+33%) |
No prompt caching and no batch discount on either side, so the comparison is like for like. Both figures assume 30 days a month.
The rate cards
| GPT-5.4 Mini | Kimi K2.5 | |
|---|---|---|
| Input, per 1M tokens | $0.75 | $0.6 |
| Output, per 1M tokens | $4.5 | $3 |
| Cached input | $0.075 | $0.1 |
| Context window | 272K | 262K |
| Maximum output | 128K | 262K |
| Reasoning model | yes | yes |
| Vision | yes | yes |
Run this comparison on your own numbers
Full detail: GPT-5.4 Mini pricing · Kimi K2.5 pricing