GLM 5.3 Prime vs Kimi K3: price, context window and capabilities
GLM 5.3 Prime (z-ai/glm-5.3-prime) is a language model from Z.ai and Kimi K3 (moonshotai/kimi-k3) a multimodal language model from MoonshotAI; both are on the OceanToken API. GLM 5.3 Prime costs less per token than Kimi K3: $2.80 against $3.00 per 1M input tokens (7% less) and $8.80 against $15.00 per 1M output tokens (41% less). Kimi K3 has the larger context window: 1.05M tokens (1,048,576) against 1M (1,000,000) for GLM 5.3 Prime. Both support tool calling and reasoning; only Kimi K3 also lists structured outputs, image input and video input.
Side by side
| Spec | GLM 5.3 Prime | Kimi K3 |
|---|---|---|
| Model | GLM 5.3 Primez- | Kimi K3moonshotai/ |
| Publisher | Z.ai | MoonshotAI |
| Kind | Text | Text, vision & video |
| Context window | 1M tokens1,000,000 | 1.05M tokens1,048,576 |
| Input price | $2.80 / 1M tokens | $3.00 / 1M tokens |
| Output price | $8.80 / 1M tokens | $15.00 / 1M tokens |
| Cached input price | $0.56 / 1M tokens | $0.30 / 1M tokens |
| Inputs | text | text, images and video |
| Outputs | text | text |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Structured outputs | Not listed | Yes |
About these prices
Which should you choose?
- Choose GLM 5.3 Prime to spend less per token: 7% less for input and 41% less for output than Kimi K3.
- Choose Kimi K3 for the longest inputs: its context window holds 1.05M tokens against 1M for GLM 5.3 Prime.
- Choose Kimi K3 if you need structured outputs, image input and video input: GLM 5.3 Prime does not list them.
- 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 GLM 5.3 Prime Kimi K3
Frequently asked questions
Which is cheaper, GLM 5.3 Prime or Kimi K3?
GLM 5.3 Prime. GLM 5.3 Prime costs less per token than Kimi K3: $2.80 against $3.00 per 1M input tokens (7% less) and $8.80 against $15.00 per 1M output tokens (41% less). These are OceanToken starting prices per use; the OceanToken console always shows the current price.
Which has the larger context window, GLM 5.3 Prime or Kimi K3?
Kimi K3. Kimi K3 has the larger context window: 1.05M tokens (1,048,576) against 1M (1,000,000) for GLM 5.3 Prime.
Can I call both GLM 5.3 Prime and Kimi K3 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 z-ai/glm-5.3-prime or moonshotai/kimi-k3.
Models and publishers
GLM 5.3 Prime · Kimi K3 · All Z.ai models · All MoonshotAI models
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