GPT-5.6 Sol
GPT-5.6 Sol is OpenAI's flagship reasoning model, released July 9, 2026, at $5 per million input tokens and $30 per million output. It scores 61 on the Artificial Analysis Intelligence Index — five places behind Claude Opus 5 — with a 1M-token context window and text-plus-image input.
Spec sheet
| Maker | OpenAI |
|---|---|
| Released | 2026-07-09 |
| API ID | gpt-5.6-sol |
| Parameters | Not disclosed |
| Context window | 1M tokens |
| Modalities in | text, image |
| Modalities out | text |
| API availability | OpenAI API · Azure AI Foundry (unverified) |
| Pricing (per MTok) | $5 in / $30 outas of · source |
Benchmarks
| Benchmark | Score | Measured | Source |
|---|---|---|---|
| AA Intelligence Index | 61 | artificialanalysis.ai |
Dashed values are vendor-published and not yet reproduced in our harness — methodology.
Changelog
- OpenAI ships the GPT-5.6 family: Sol, Terra, and Lunasource
Head-to-head
Profile published August 11, 2026; data last changed August 11, 2026. Every value carries its own measurement or verification date. Flagged values are best-known public figures pending confirmation.