Kimi K3 vs Grok Build 0.1: price, context window and capabilities
Kimi K3 (moonshotai/kimi-k3) from MoonshotAI and Grok Build 0.1 (x-ai/grok-build-0.1) from SpaceXAI are both multimodal language models on the OceanToken API. Grok Build 0.1 costs less per token than Kimi K3: $1.00 against $3.00 per 1M input tokens (67% less) and $2.00 against $15.00 per 1M output tokens (87% less). Kimi K3 has the larger context window: 1.05M tokens (1,048,576) against 256K (256,000) for Grok Build 0.1. Both support tool calling, reasoning, structured outputs and image input; only Kimi K3 also lists video input; only Grok Build 0.1 also lists file input.
Side by side
| Spec | Kimi K3 | Grok Build 0.1 |
|---|---|---|
| Model | Kimi K3moonshotai/ | Grok Build 0.1x- |
| Publisher | MoonshotAI | SpaceXAI |
| Kind | Text, vision & video | Text & vision |
| Context window | 1.05M tokens1,048,576 | 256K tokens256,000 |
| Input price | $3.00 / 1M tokens | $1.00 / 1M tokens |
| Output price | $15.00 / 1M tokens | $2.00 / 1M tokens |
| Cached input price | $0.30 / 1M tokens | $0.20 / 1M tokens |
| Web search price | – | $0.005 / search |
| Inputs | text, images and video | text, images and files |
| Outputs | text | text |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Structured outputs | Yes | Yes |
About these prices
Which should you choose?
- Choose Grok Build 0.1 to spend less per token: 67% less for input and 87% less for output than Kimi K3.
- Choose Kimi K3 for the longest inputs: its context window holds 1.05M tokens against 256K for Grok Build 0.1.
- Choose Kimi K3 if you need video input: Grok Build 0.1 does not list it.
- Not sure? Call both with the same OceanToken API key and compare them on your own prompts; each request is billed per use from one prepaid balance.
Get API Key Kimi K3 Grok Build 0.1
Frequently asked questions
Which is cheaper, Kimi K3 or Grok Build 0.1?
Grok Build 0.1. Grok Build 0.1 costs less per token than Kimi K3: $1.00 against $3.00 per 1M input tokens (67% less) and $2.00 against $15.00 per 1M output tokens (87% less). These are OceanToken starting prices per use; the OceanToken console always shows the current price.
Which has the larger context window, Kimi K3 or Grok Build 0.1?
Kimi K3. Kimi K3 has the larger context window: 1.05M tokens (1,048,576) against 256K (256,000) for Grok Build 0.1.
Can I call both Kimi K3 and Grok Build 0.1 with one API key?
Yes. Both are on the OceanToken API at https://api.oceantoken.ai/v1: one API key and one prepaid balance call either model. Send the model id moonshotai/kimi-k3 or x-ai/grok-build-0.1.
Models and publishers
Kimi K3 · Grok Build 0.1 · All MoonshotAI models · All SpaceXAI models
More comparisons
Kimi K3 vs DeepSeek V4 Pro · Kimi K3 vs Claude Sonnet 5.5 · GLM 5.3 vs Kimi K3 · DeepSeek V4.1 Flash vs Grok Build 0.1 · All comparisons