Head to head
GPT-5.6 Sol vs GPT-6 Sol
GPT-5.6 Sol (OpenAI) and GPT-6 Sol (OpenAI) compared on intelligence, speed, context, and price — and which to choose. Both run on just4o.chat from one chat.
| Metric | GPT-5.6 Sol | GPT-6 Sol |
|---|---|---|
| Intelligence (AA index) | — | — |
| Output speed (tokens/sec) | — | — |
| Context window | 1.1M | 1.1M |
| Max output | 128K | 128K |
| Input price / 1M | $5 | $2 ✓ |
| Output price / 1M | $30 | $10 ✓ |
| Released | 2026-07-09 | 2026-09-22 |
Choose GPT-5.6 Sol if you want…
- A comparable all-rounder — they trade blows on the headline metrics.
Choose GPT-6 Sol if you want…
- Lower price ($4 / 1M blended)
FAQ
Which is better, GPT-5.6 Sol or GPT-6 Sol?
GPT-6 Sol leads on 1 of the headline metrics (lower price ($4 / 1m blended)), while GPT-5.6 Sol wins on other factors. The right pick depends on your priorities.
Is GPT-5.6 Sol or GPT-6 Sol cheaper?
GPT-6 Sol is cheaper at $4 per 1M tokens (blended), versus $11.25.
Can I use both GPT-5.6 Sol and GPT-6 Sol?
Yes. Both are available on just4o.chat from a single chat — you can switch between them per message with no separate subscriptions.