GLM 5.3 FlashX vs Kimi K3: price, context window and capabilities
GLM 5.3 FlashX (z-ai/glm-5.3-flashx) from Z.ai and Kimi K3 (moonshotai/kimi-k3) from MoonshotAI are both multimodal language models on the OceanToken API. GLM 5.3 FlashX costs less per token than Kimi K3: $0.37 against $3.00 per 1M input tokens (88% less) and $1.25 against $15.00 per 1M output tokens (92% less). Both have a 1.05M-token context window (1,048,576 tokens). Both support tool calling, reasoning, image input and video input; only Kimi K3 also lists structured outputs.
Side by side
| Spec | GLM 5.3 FlashX | Kimi K3 |
|---|---|---|
| Model | GLM 5.3 FlashXz- | Kimi K3moonshotai/ |
| Publisher | Z.ai | MoonshotAI |
| Kind | Text, vision & video | Text, vision & video |
| Context window | 1.05M tokens1,048,576 | 1.05M tokens1,048,576 |
| Input price | $0.37 / 1M tokens | $3.00 / 1M tokens |
| Output price | $1.25 / 1M tokens | $15.00 / 1M tokens |
| Cached input price | $0.09 / 1M tokens | $0.30 / 1M tokens |
| Inputs | text, images and video | 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 FlashX to spend less per token: 88% less for input and 92% less for output than Kimi K3.
- Context size does not separate them: both hold about 1.05M tokens.
- Choose Kimi K3 if you need structured outputs: GLM 5.3 FlashX 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 GLM 5.3 FlashX Kimi K3
Frequently asked questions
Which is cheaper, GLM 5.3 FlashX or Kimi K3?
GLM 5.3 FlashX. GLM 5.3 FlashX costs less per token than Kimi K3: $0.37 against $3.00 per 1M input tokens (88% less) and $1.25 against $15.00 per 1M output tokens (92% 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 FlashX or Kimi K3?
Neither. Both have a 1.05M-token context window (1,048,576 tokens).
Can I call both GLM 5.3 FlashX 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-flashx or moonshotai/kimi-k3.
Models and publishers
GLM 5.3 FlashX · Kimi K3 · All Z.ai models · All MoonshotAI models
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