GPT-5.5 vs GPT-5.6 Sol
Price, context and benchmark scores side by side — every number from the live model catalogue.
| GPT-5.5openai | GPT-5.6 Solopenai | |
|---|---|---|
| Input / 1M tokens | $5.00 | $5.00 |
| Output / 1M tokens | $30.00 | $30.00 |
| 1M in + 300K out | $14.00 | $14.00 |
| Context window | 1.1M | 1.1M |
| Intelligence index | 54.8 | 58.9 |
| Coding index | 74.9 | 77.4 |
| Agentic index | 44.9 | 54.0 |
| Cheapest provider | Azure | Azure |
| Providers serving it | 2 | 2 |
| Weights | Closed | Closed |
| Image input | Yes | Yes |
| Tool calling | Yes | Yes |
| Reasoning mode | Yes | Yes |
| Released | Apr 24, 2026 | Jul 9, 2026 |
Which one to pick
Pick GPT-5.5 if…
Pick GPT-5.6 Sol if…
- You want the higher general-intelligence score (58.9).
- Code quality is the priority — it leads on the coding index (77.4).
- You are running agent loops — higher agentic index (54.0).
- Token cost matters: $30.00 per 1M output vs $30.00.
- You need the bigger context window (1.1M).
FAQ
Is GPT-5.5 better than GPT-5.6 Sol?
GPT-5.6 Sol scores higher on general intelligence (54.8 vs 58.9), while GPT-5.6 Sol is 1.0× cheaper per output token ($30.00 vs $30.00). For code, GPT-5.6 Sol leads (77.4 coding index). GPT-5.6 Sol takes the larger context at 1.1M.
Which is cheaper, GPT-5.5 or GPT-5.6 Sol?
GPT-5.6 Sol, at $30.00 per 1M output tokens versus $30.00. On a 1M input + 300K output workload that is $14.00 against $14.00.
Can I self-host GPT-5.5 or GPT-5.6 Sol?
GPT-5.5: closed weights, API only. GPT-5.6 Sol: closed weights, API only.