GPT-5.6 Luna charges $0.20 per 1M input tokens and $1.20 per 1M output tokens (cached input: $0.02/M). Real bills depend on your input/output split — the tables below price GPT-5.6 Luna at 1K–1M tokens across common workload shapes. Verified Aug 28, 2026
Quick answer
At 1 million tokens, GPT-5.6 Luna costs $0.20 for input and $1.20 for output. Your real monthly bill depends on the input/output split and cache rate.
Method & trust
The rate card separates input, output, and cached-input prices, then shows exact costs at common token volumes and workload splits. Provider rates can change, so the source link and verification date on this page are authoritative checkpoints.
Cost by token volume
| Volume | Input-heavy (90/10) | Balanced (70/30) | Output-heavy (30/70) | All input | All output |
|---|---|---|---|---|---|
| 1,000 tokens | $0.0003 | $0.0005 | $0.0009 | $0.0002 | $0.0012 |
| 10,000 tokens | $0.003 | $0.005 | $0.009 | $0.002 | $0.012 |
| 100,000 tokens | $0.03 | $0.05 | $0.09 | $0.02 | $0.12 |
| 1 million tokens | $0.30 | $0.50 | $0.90 | $0.20 | $1.20 |
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% | $0.00176 | $528.00 | — |
| 50% | $0.0014 | $420.00 | −$108.00 |
| 75% | $0.00122 | $366.00 | −$162.00 |
Monthly projections
| Scale | Requests / day | Chat workload / month | Agentic workload / month* |
|---|---|---|---|
| 100 req/day | 3,000 | $4.20 | $15.36 |
| 1K req/day | 30,000 | $42.00 | $153.60 |
| 10K req/day | 300,000 | $420.00 | $1,536.00 |
| 100K req/day | 3,000,000 | $4,200.00 | $15,360.00 |
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 $0.20; 1M purely output tokens cost $1.20. 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 $0.0014 with 50% cached input, or $0.00176 without caching.
At 1,000 requests/day of a chat workload (4K in / 800 out, 50% cached): $42.00/month. At 10,000 requests/day: $420.00/month. Model your exact mix with the monthly cost calculator.