o4-mini charges $1.10 per 1M input tokens and $4.40 per 1M output tokens (cached input: $0.275/M). Real bills depend on your input/output split — the tables below price o4-mini at 1K–1M tokens across common workload shapes. Verified Aug 16, 2026
Cost by token volume
| Volume | Input-heavy (90/10) | Balanced (70/30) | Output-heavy (30/70) | All input | All output |
|---|---|---|---|---|---|
| 1,000 tokens | $0.00143 | $0.00209 | $0.00341 | $0.0011 | $0.0044 |
| 10,000 tokens | $0.0143 | $0.0209 | $0.0341 | $0.011 | $0.044 |
| 100,000 tokens | $0.143 | $0.209 | $0.341 | $0.11 | $0.44 |
| 1 million tokens | $1.43 | $2.09 | $3.41 | $1.10 | $4.40 |
Uncached. Volume links open interactive pages with adjustable splits.
Prompt caching impact
| Cached share of input | Chat request (4K in / 800 out) | Monthly @ 10K req/day | Savings / month |
|---|---|---|---|
| 0% | $0.00792 | $2,376.00 | — |
| 50% | $0.00627 | $1,881.00 | −$495.00 |
| 75% | $0.005445 | $1,633.50 | −$742.50 |
Monthly projections
| Scale | Requests / day | Chat workload / month | Agentic workload / month* |
|---|---|---|---|
| 100 req/day | 3,000 | $18.81 | $87.45 |
| 1K req/day | 30,000 | $188.10 | $874.50 |
| 10K req/day | 300,000 | $1,881.00 | $8,745.00 |
| 100K req/day | 3,000,000 | $18,810.00 | $87,450.00 |
Chat: 4K in / 800 out, 50% cached. *Agentic: 40K in / 1.5K out, 65% cached. Model your exact mix in the monthly cost calculator.
FAQ
1M purely input tokens cost $1.10; 1M purely output tokens cost $4.40. A typical mixed workload lands in between — see the volume table for exact splits.
A chat-style request (4,000 input + 800 output) costs about $0.00627 with 50% cached input, or $0.00792 without caching.
At 1,000 requests/day of a chat workload (4K in / 800 out, 50% cached): $188.10/month. At 10,000 requests/day: $1,881.00/month. Model your exact mix with the monthly cost calculator.