GPT-5.6 Sol is a flagship model in the GPT-5.6 family. It roughly corresponds to the unsuffixed model tier used in earlier GPT-5 families. The `gpt-5.6` alias routes requests to GPT-5.6 Sol. Reasoning.effort supports: none, low, medium (default), high, xhigh, and max.
function_callinghttps://api.openai.com/v1/responses| Input | Output | Cached input | 30m write | 12h write | |
|---|---|---|---|---|---|
| Standard | $4 | $20 | $0.4 | $5 | $10 |
| Batch | $2 | $10 | $0.2 | $2.5 | $5 |
| Fast | $8 | $40 | $0.8 | $10 | $20 |
| Model | Context | Max out | Pricing |
|---|---|---|---|
| GPT-5.6 Luna | 1.1M | 128K | $0.2$1.2 |
| GPT-5.6 Terra | 1.1M | 128K | $2$12 |
/v1/models/openai/gpt-5.6-sol