AI Cost Calculator / Comparison
Which is cheaper for your workload: Grok 4.1 Fast or Gpt 5.4 Mini? Both are scored against the same three canonical workloads below using per-1M-token list pricing as of 2026-08-15. Gpt 5.4 Mini is cheaper in 3 of 3 workloads — but your own token mix decides, so open the calculator with your numbers.
| Workload | Grok 4.1 Fast | Gpt 5.4 Mini | Cheaper | Try it |
|---|---|---|---|---|
Chat assistant 1.2K input / 400 output tokens per call, light prompt caching, 500 calls/day. | $240.00/mo | $41.40/mo | Gpt 5.4 Mini | Open in calculator |
Long-context RAG 100K input / 500 output tokens per call, heavy cache reads, 200 calls/day. | $3075.00/mo | $490.50/mo | Gpt 5.4 Mini | Open in calculator |
Bulk classification 3K input / 20 output tokens per call, no caching, 100K calls/day. | $46500.00/mo | $7020.00/mo | Gpt 5.4 Mini | Open in calculator |
| Model | Input /1M | Output /1M | Cache read /1M | Cache write /1M | Context | Source |
|---|---|---|---|---|---|---|
| Grok 4.1 Fast frontier | $5.00 | $25.00 | — | — | 131,072 | xAI |
| Gpt 5.4 Mini fast | $0.750 | $4.50 | $0.075 | — | 272,000 | OpenAI |
Cache rates of — mean the provider has not published that tier. Batch API discounts (typically 50%) and negotiated rates are not included — toggle Batch mode in the calculator for those.
Token mix, caching, and volume flip the ranking constantly. Enter your real numbers and compare Grok 4.1 Fast vs Gpt 5.4 Mini side by side — free, no account, runs in your browser.
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