GPT-5.5 vs Kimi K3.1 Pro
GPT-5.5 (OpenAI) vs Kimi K3.1 Pro (Moonshot AI), 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. At a glance, Kimi K3.1 Pro is the cheaper option.
Specs side by side
| Spec | GPT-5.5 | Kimi K3.1 Pro |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Type | Text | Text |
| Context window | 1M | 1M |
| Max output | 128K | 400K |
| Input price | $5.00 / 1M | $2.00 / 1M |
| Output price | $30.00 / 1M | $10.00 / 1M |
| Speed | Medium | Medium |
| Arabic support | Strong | Partial |
Which should you choose?
- Stronger Arabic support for Gulf and MENA use
- Lower cost, about 2.5× cheaper ($2.00 / 1M)
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 Kimi K3.1 Pro?
Kimi K3.1 Pro costs less ($2.00 / 1M vs $5.00 / 1M); GPT-5.5 has stronger Arabic support. Both are available on thalam behind one OpenAI-compatible API.
Is GPT-5.5 or Kimi K3.1 Pro cheaper?
Kimi K3.1 Pro is cheaper on input ($2.00 / 1M vs $5.00 / 1M). On thalam you pay per use, so you can route cheap-by-default and fall back to the other only when needed.
Can I use both GPT-5.5 and Kimi K3.1 Pro 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.