Kimi K3 vs Grok 4.20 Beta
moonshotai/kimi-k3 · x-ai/grok-4.20-beta
As of November 3, 2026, Kimi K3 is the cheaper API on UberLLM: $0.0017 per million input tokens and $0.0781 per million output, versus $0.1750 / $0.3500 for Grok 4.20 Beta, about 81% less when output is 3 tokens for every input token. These are the best prices on the market right now. Both work with one OpenAI-compatible key and UberLLM adds no fee. Choose Kimi K3 to cut cost; choose Grok 4.20 Beta when context size wins. Grok 4.20 Beta carries the larger context window (2,000,000 vs 1,000,000 tokens), which can matter for long-document work.
Kimi K3 vs Grok 4.20 Beta, side by side
| Spec | Kimi K3 | Grok 4.20 Beta |
|---|---|---|
| Price · input / 1M | $0.0017 | $0.1750 |
| Price · output / 1M | $0.0781 | $0.3500 |
| Context length | 1,000,000 | 2,000,000 |
| Max output tokens | 131,072 | 128,000 |
| Input modalities | text, image | text, image |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | Yes | Yes |
| Reasoning | Yes | Yes |
| % off list | 99.3% off | 86% off |
| First token, median (7 days) | 3.3 s (1,160 requests) | — |
Best prices on UberLLM right now. No UberLLM fee on requests; adding credit by card costs 5.5% + $0.50. Updated November 3, 2026. A price more than 70% below list is what buyers were billed, not an error. Why so cheap?
Kimi K3 vs Grok 4.20 Beta — FAQ
Is Kimi K3 or Grok 4.20 Beta cheaper?
Kimi K3 is cheaper on a blended token mix, by about 81%. A request costs what its provider charged, UberLLM adds no fee, and every request is listed with its cost in Activity.
What's the price difference between Kimi K3 and Grok 4.20 Beta?
Kimi K3: $0.0017 in / $0.0781 out per 1M tokens. Grok 4.20 Beta: $0.1750 in / $0.3500 out per 1M tokens. That's roughly a 81% blended difference. Prices are live; UberLLM adds no fee.
Can I use both Kimi K3 and Grok 4.20 Beta with one API?
Yes. Both are served through a single OpenAI-compatible endpoint — set the base URL to https://api.uberllm.dev/v1 and your UberLLM key, then switch between them by changing the model id. Anthropic SDKs work via https://api.uberllm.dev/v1/messages.