Grok 4.3 vs Kimi K3
Grok 4.3 (xAI) vs Kimi K3 (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, Grok 4.3 is the cheaper option and Grok 4.3 is rated faster.
Specs side by side
| Spec | Grok 4.3 | Kimi K3 |
|---|---|---|
| Provider | xAI | Moonshot AI |
| Type | Text | Text |
| Context window | 1M | 1M |
| Max output | 400K | 400K |
| Input price | $1.25 / 1M | $3.00 / 1M |
| Output price | $2.50 / 1M | $15.00 / 1M |
| Speed | Fast | Medium |
| Arabic support | Partial | Partial |
Which should you choose?
- Lower cost, about 2.4× cheaper ($1.25 / 1M)
- Rated faster (Fast) for latency-sensitive workloads
- Moonshot's new flagship generation. A 1M-token context and the strongest measured reasoning in our catalog
One OpenAI-compatible endpoint, one bill. Switch between them with a single model id change, pay per use, credits never expire.
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FAQ
What's the difference between Grok 4.3 and Kimi K3?
Grok 4.3 costs less ($1.25 / 1M vs $3.00 / 1M); Grok 4.3 is rated faster. Both are available on thalam behind one OpenAI-compatible API.
Is Grok 4.3 or Kimi K3 cheaper?
Grok 4.3 is cheaper on input ($1.25 / 1M vs $3.00 / 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 Grok 4.3 and Kimi K3 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.