GLM 5.3 Prime vs Gemini 3.1 Pro Preview: price, context window and capabilities
GLM 5.3 Prime (z-ai/glm-5.3-prime) is a language model from Z.ai and Gemini 3.1 Pro Preview (google/gemini-3.1-pro-preview) a multimodal language model from Google; both are on the OceanToken API. GLM 5.3 Prime costs less for output: $8.80 against $10.80 per 1M output tokens (19% less); Gemini 3.1 Pro Preview costs less for input: $1.80 against $2.80 per 1M input tokens (36% less). Gemini 3.1 Pro Preview is 10% off its official price on OceanToken, for every account. Gemini 3.1 Pro Preview has the larger context window: 1.05M tokens (1,048,576) against 1M (1,000,000) for GLM 5.3 Prime. Both support tool calling and reasoning; only Gemini 3.1 Pro Preview also lists structured outputs, image input, file input, audio input and video input.
Side by side
| Spec | GLM 5.3 Prime | Gemini 3.1 Pro Preview −10% |
|---|---|---|
| Model | GLM 5.3 Primez- | Gemini 3.1 Pro Previewgoogle/ |
| Publisher | Z.ai | |
| Kind | Text | Text, vision, audio & video |
| Context window | 1M tokens1,000,000 | 1.05M tokens1,048,576 |
| Input price | $2.80 / 1M tokens | $1.80 / 1M tokens |
| Output price | $8.80 / 1M tokens | $10.80 / 1M tokens |
| Cached input price | $0.56 / 1M tokens | $0.20 / 1M tokens |
| Cache write price | – | $2.375 / 1M tokens |
| Web search price | – | $0.014 / search |
| Discount (vs official, top tier) | — | −10% |
| Inputs | text | text, images, files, audio and video |
| Outputs | text | text |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Structured outputs | Not listed | Yes |
About these prices
Which should you choose?
- Price depends on the mix: GLM 5.3 Prime costs less for output and Gemini 3.1 Pro Preview for input, so estimate both on your own volume of input tokens and output tokens.
- Choose Gemini 3.1 Pro Preview for the longest inputs: its context window holds 1.05M tokens against 1M for GLM 5.3 Prime.
- Choose Gemini 3.1 Pro Preview if you need structured outputs, image input, file input, audio input and video 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 Gemini 3.1 Pro Preview
Frequently asked questions
Which is cheaper, GLM 5.3 Prime or Gemini 3.1 Pro Preview?
It depends on the mix of tokens. GLM 5.3 Prime costs less for output: $8.80 against $10.80 per 1M output tokens (19% less); Gemini 3.1 Pro Preview costs less for input: $1.80 against $2.80 per 1M input tokens (36% less). Gemini 3.1 Pro Preview is 10% off its official price on OceanToken, for every account. The OceanToken console always shows the current price.
Which has the larger context window, GLM 5.3 Prime or Gemini 3.1 Pro Preview?
Gemini 3.1 Pro Preview. Gemini 3.1 Pro Preview has the larger context window: 1.05M tokens (1,048,576) against 1M (1,000,000) for GLM 5.3 Prime.
Can I call both GLM 5.3 Prime and Gemini 3.1 Pro Preview 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 google/gemini-3.1-pro-preview.
Models and publishers
GLM 5.3 Prime · Gemini 3.1 Pro Preview · All Z.ai models · All Google models
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