GLM 5.3 FlashX vs Grok Build 0.1: price, context window and capabilities
GLM 5.3 FlashX (z-ai/glm-5.3-flashx) from Z.ai and Grok Build 0.1 (x-ai/grok-build-0.1) from SpaceXAI are both multimodal language models on the OceanToken API. GLM 5.3 FlashX costs less per token than Grok Build 0.1: $0.37 against $1.00 per 1M input tokens (63% less) and $1.25 against $2.00 per 1M output tokens (38% less). GLM 5.3 FlashX 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 and image input; only GLM 5.3 FlashX also lists video input; only Grok Build 0.1 also lists structured outputs and file input.
Side by side
| Spec | GLM 5.3 FlashX | Grok Build 0.1 |
|---|---|---|
| Model | GLM 5.3 FlashXz- | Grok Build 0.1x- |
| Publisher | Z.ai | SpaceXAI |
| Kind | Text, vision & video | Text & vision |
| Context window | 1.05M tokens1,048,576 | 256K tokens256,000 |
| Input price | $0.37 / 1M tokens | $1.00 / 1M tokens |
| Output price | $1.25 / 1M tokens | $2.00 / 1M tokens |
| Cached input price | $0.09 / 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 | Not listed | Yes |
About these prices
Which should you choose?
- Choose GLM 5.3 FlashX to spend less per token: 63% less for input and 38% less for output than Grok Build 0.1.
- Choose GLM 5.3 FlashX for the longest inputs: its context window holds 1.05M tokens against 256K for Grok Build 0.1.
- Choose GLM 5.3 FlashX 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 GLM 5.3 FlashX Grok Build 0.1
Frequently asked questions
Which is cheaper, GLM 5.3 FlashX or Grok Build 0.1?
GLM 5.3 FlashX. GLM 5.3 FlashX costs less per token than Grok Build 0.1: $0.37 against $1.00 per 1M input tokens (63% less) and $1.25 against $2.00 per 1M output tokens (38% 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 Grok Build 0.1?
GLM 5.3 FlashX. GLM 5.3 FlashX has the larger context window: 1.05M tokens (1,048,576) against 256K (256,000) for Grok Build 0.1.
Can I call both GLM 5.3 FlashX 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 z-ai/glm-5.3-flashx or x-ai/grok-build-0.1.
Models and publishers
GLM 5.3 FlashX · Grok Build 0.1 · All Z.ai models · All SpaceXAI models
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