GLM 5.3 Prime vs Grok 4.5: price, context window and capabilities
GLM 5.3 Prime (z-ai/glm-5.3-prime) is a language model from Z.ai and Grok 4.5 (x-ai/grok-4.5) a multimodal language model from SpaceXAI; both are on the OceanToken API. Grok 4.5 costs less per token than GLM 5.3 Prime: $2.00 against $2.80 per 1M input tokens (29% less) and $6.00 against $8.80 per 1M output tokens (32% less). GLM 5.3 Prime has the larger context window: 1M tokens (1,000,000) against 500K (500,000) for Grok 4.5. Both support tool calling and reasoning; only Grok 4.5 also lists structured outputs, image input and file input.
Side by side
| Spec | GLM 5.3 Prime | Grok 4.5 |
|---|---|---|
| Model | GLM 5.3 Primez- | Grok 4.5x- |
| Publisher | Z.ai | SpaceXAI |
| Kind | Text | Text & vision |
| Context window | 1M tokens1,000,000 | 500K tokens500,000 |
| Input price | $2.80 / 1M tokens | $2.00 / 1M tokens |
| Output price | $8.80 / 1M tokens | $6.00 / 1M tokens |
| Cached input price | $0.56 / 1M tokens | $0.30 / 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 4.5 to spend less per token: 29% less for input and 32% less for output than GLM 5.3 Prime.
- Choose GLM 5.3 Prime for the longest inputs: its context window holds 1M tokens against 500K for Grok 4.5.
- Choose Grok 4.5 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 4.5
Frequently asked questions
Which is cheaper, GLM 5.3 Prime or Grok 4.5?
Grok 4.5. Grok 4.5 costs less per token than GLM 5.3 Prime: $2.00 against $2.80 per 1M input tokens (29% less) and $6.00 against $8.80 per 1M output tokens (32% 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 4.5?
GLM 5.3 Prime. GLM 5.3 Prime has the larger context window: 1M tokens (1,000,000) against 500K (500,000) for Grok 4.5.
Can I call both GLM 5.3 Prime and Grok 4.5 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-4.5.
Models and publishers
GLM 5.3 Prime · Grok 4.5 · All Z.ai models · All SpaceXAI models
More comparisons
DeepSeek V4.1 Flash vs Grok 4.5 · DeepSeek V4 Pro vs Grok 4.5 · DeepSeek V4 Flash 0731 vs Grok 4.5 · DeepSeek V3.2 vs Grok 4.5 · All comparisons