GLM 5.3 vs Kimi K3: price, context window and capabilities
GLM 5.3 (z-ai/glm-5.3) 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 costs less per token than Kimi K3: $1.19 against $3.00 per 1M input tokens (60% less) and $3.74 against $15.00 per 1M output tokens (75% less). Both have a 1.05M-token context window (1,048,576 tokens). Both support tool calling, reasoning and structured outputs; only Kimi K3 also lists image input and video input.
Side by side
| Spec | GLM 5.3 −25% | Kimi K3 |
|---|---|---|
| Model | GLM 5.3z- | Kimi K3moonshotai/ |
| Publisher | Z.ai | MoonshotAI |
| Kind | Text | Text, vision & video |
| Context window | 1.05M tokens1,048,576 | 1.05M tokens1,048,576 |
| Input price | $1.19 / 1M tokens | $3.00 / 1M tokens |
| Output price | $3.74 / 1M tokens | $15.00 / 1M tokens |
| Cached input price | $0.26 / 1M tokens | $0.30 / 1M tokens |
| Discount (vs official, top tier) | −25% | — |
| Inputs | text | text, images and video |
| Outputs | text | text |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Structured outputs | Yes | Yes |
About these prices
Which should you choose?
- Choose GLM 5.3 to spend less per token: 60% less for input and 75% less for output than Kimi K3.
- Context size does not separate them: both hold about 1.05M tokens.
- Choose Kimi K3 if you need image input and video input: GLM 5.3 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.
Frequently asked questions
Which is cheaper, GLM 5.3 or Kimi K3?
GLM 5.3. GLM 5.3 costs less per token than Kimi K3: $1.19 against $3.00 per 1M input tokens (60% less) and $3.74 against $15.00 per 1M output tokens (75% 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 or Kimi K3?
Neither. Both have a 1.05M-token context window (1,048,576 tokens).
Can I call both GLM 5.3 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 or moonshotai/kimi-k3.
Models and publishers
GLM 5.3 · Kimi K3 · All Z.ai models · All MoonshotAI models
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