GPT-5.5 vs GPT-5.6 Sol
GPT-5.5 (OpenAI) vs GPT-5.6 Sol (OpenAI), compared on price, context, speed and Arabic support. Both run on thalam through one OpenAI-compatible API, so you can switch between them with a single model id change.
Specs side by side
| Spec | GPT-5.5 | GPT-5.6 Sol |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Type | Text | Text |
| Context window | 1M | 1M |
| Max output | 128K | 128K |
| Input price | $5.00 / 1M | $5.00 / 1M |
| Output price | $30.00 / 1M | $30.00 / 1M |
| Speed | Medium | Medium |
| Arabic support | Strong | Strong |
Which should you choose?
- OpenAI's flagship GPT-5.5. Top-tier general intelligence, coding, and agentic tasks with a 1M-token context
- The top tier of OpenAI's GPT-5.6 generation. Frontier reasoning, coding, and agentic work with a 1M-token context and image input
One OpenAI-compatible endpoint, one bill. Switch between them with a single model id change, pay per use, credits never expire.
Related comparisons
FAQ
What's the difference between GPT-5.5 and GPT-5.6 Sol?
They are closely matched on the headline specs; the best choice depends on your workload. Both are available on thalam behind one OpenAI-compatible API.
Is GPT-5.5 or GPT-5.6 Sol cheaper?
They are priced similarly ($5.00 / 1M vs $5.00 / 1M). On thalam you pay per use with no subscription, so you can A/B them on cost with no commitment.
Can I use both GPT-5.5 and GPT-5.6 Sol with one API key?
Yes. thalam is OpenAI-compatible, so both models are reachable through the same endpoint. Switching between them is a one-line model id change, no code rewrite.