GLM 5.3 Prime vs Grok Build 0.1: price, context window and capabilities
GLM 5.3 Prime (z-ai/glm-5.3-prime) is a language model from Z.ai and Grok Build 0.1 (x-ai/grok-build-0.1) a multimodal language model from SpaceXAI; both are on the OceanToken API. Grok Build 0.1 costs less per token than GLM 5.3 Prime: $1.00 against $2.80 per 1M input tokens (64% less) and $2.00 against $8.80 per 1M output tokens (77% less). GLM 5.3 Prime has the larger context window: 1M tokens (1,000,000) against 256K (256,000) for Grok Build 0.1. Both support tool calling and reasoning; only Grok Build 0.1 also lists structured outputs, image input and file input.
Side by side
| Spec | GLM 5.3 Prime | Grok Build 0.1 |
|---|---|---|
| Model | GLM 5.3 Primez- | Grok Build 0.1x- |
| Publisher | Z.ai | SpaceXAI |
| Kind | Text | Text & vision |
| Context window | 1M tokens1,000,000 | 256K tokens256,000 |
| Input price | $2.80 / 1M tokens | $1.00 / 1M tokens |
| Output price | $8.80 / 1M tokens | $2.00 / 1M tokens |
| Cached input price | $0.56 / 1M tokens | $0.20 / 1M tokens |
| Web search price | – | $0.005 / search |
| Inputs | text | 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 Grok Build 0.1 to spend less per token: 64% less for input and 77% less for output than GLM 5.3 Prime.
- Choose GLM 5.3 Prime for the longest inputs: its context window holds 1M tokens against 256K for Grok Build 0.1.
- Choose Grok Build 0.1 if you need structured outputs, image input and file 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 Grok Build 0.1
Frequently asked questions
Which is cheaper, GLM 5.3 Prime or Grok Build 0.1?
Grok Build 0.1. Grok Build 0.1 costs less per token than GLM 5.3 Prime: $1.00 against $2.80 per 1M input tokens (64% less) and $2.00 against $8.80 per 1M output tokens (77% 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 Grok Build 0.1?
GLM 5.3 Prime. GLM 5.3 Prime has the larger context window: 1M tokens (1,000,000) against 256K (256,000) for Grok Build 0.1.
Can I call both GLM 5.3 Prime 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-prime or x-ai/grok-build-0.1.
Models and publishers
GLM 5.3 Prime · Grok Build 0.1 · All Z.ai models · All SpaceXAI models
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