GPT-5.6 Sol vs GPT-5.5
Facts only. This page does not pick a winner. For a picked winner, see the use case comparison on Tools.
| GPT-5.6 Sol | GPT-5.5 | |
|---|---|---|
| API model IDs | gpt-5.6-sol | gpt-5.5, gpt-5.5-2026-04-23 |
| Context window | 1,050,000 | 1,050,000 |
| Lifecycle | active | active |
| License | proprietary | proprietary |
| Trains on API data | No | No |
| Zero data retention | on-request | on-request |
| Input per 1M tokens | $4 (verified 2026-09-08) | $5 (verified 2026-09-08) |