GPT-5.6 pricing
OpenAI · list prices as of 2026-09-29
| Input | $4 per 1M tokens |
|---|---|
| Output | $20 per 1M tokens |
| Cached input (read) | $0.40 per 1M tokens |
| Cache write | $5 per 1M tokens |
| Batch / async | 50% off |
| Context window | 922K tokens |
| Longest answer | 128K tokens |
What a call costs
| Typical call | Input tokens | Output tokens | Per call | Per month at 1,000 a day |
|---|---|---|---|---|
| Chat reply | 1,000 | 300 | $0.0100 | $300.00 |
| Document summary | 6,000 | 400 | $0.0320 | $960.00 |
| Code change | 3,000 | 1,200 | $0.0360 | $1,080 |
No caching or batch discount. Your own prompt will differ: count it exactly below.
Price your own prompt on GPT-5.6Similarly priced models
- Claude Opus 5.5 (Anthropic): about the same
- Claude Opus 4.5 (Anthropic): 1.3× more
- Claude Opus 4.6 (Anthropic): 1.3× more
- Claude Opus 4.7 (Anthropic): 1.3× more
- Claude Opus 4.8 (Anthropic): 1.3× more
Questions
How much does GPT-5.6 cost?
GPT-5.6 costs $4 per million input tokens and $20 per million output tokens, as of 2026-09-29.
How much is one GPT-5.6 call?
A call with 1,000 input tokens and a 300-token answer costs about $0.0100, or $300.00 a month at 1,000 calls a day.
How big is the GPT-5.6 context window?
922,000 tokens.