GLM 5.3 vs Gemini 3.1 Pro Preview: price, context window and capabilities
GLM 5.3 (z-ai/glm-5.3) 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 costs less per token than Gemini 3.1 Pro Preview: $1.19 against $1.80 per 1M input tokens (34% less) and $3.74 against $10.80 per 1M output tokens (65% less). Gemini 3.1 Pro Preview is 10% off its official price on OceanToken, for every account. Both have a 1.05M-token context window (1,048,576 tokens). Both support tool calling, reasoning and structured outputs; only Gemini 3.1 Pro Preview also lists image input, file input, audio input and video input.
Side by side
| Spec | GLM 5.3 −25% | Gemini 3.1 Pro Preview −10% |
|---|---|---|
| Model | GLM 5.3z- | Gemini 3.1 Pro Previewgoogle/ |
| Publisher | Z.ai | |
| Kind | Text | Text, vision, audio & video |
| Context window | 1.05M tokens1,048,576 | 1.05M tokens1,048,576 |
| Input price | $1.19 / 1M tokens | $1.80 / 1M tokens |
| Output price | $3.74 / 1M tokens | $10.80 / 1M tokens |
| Cached input price | $0.26 / 1M tokens | $0.20 / 1M tokens |
| Cache write price | – | $2.375 / 1M tokens |
| Web search price | – | $0.014 / search |
| Discount (vs official, top tier) | −25% | −10% |
| Inputs | text | text, images, files, audio and video |
| Outputs | text | text |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Structured outputs | Yes | Yes |
About these prices
Which should you choose?
- Choose GLM 5.3 to spend less per token: 34% less for input and 65% less for output than Gemini 3.1 Pro Preview.
- Context size does not separate them: both hold about 1.05M tokens.
- Choose Gemini 3.1 Pro Preview if you need image input, file input, audio input and video input: GLM 5.3 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 Gemini 3.1 Pro Preview
Frequently asked questions
Which is cheaper, GLM 5.3 or Gemini 3.1 Pro Preview?
GLM 5.3. GLM 5.3 costs less per token than Gemini 3.1 Pro Preview: $1.19 against $1.80 per 1M input tokens (34% less) and $3.74 against $10.80 per 1M output tokens (65% 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 or Gemini 3.1 Pro Preview?
Neither. Both have a 1.05M-token context window (1,048,576 tokens).
Can I call both GLM 5.3 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 or google/gemini-3.1-pro-preview.
Models and publishers
GLM 5.3 · Gemini 3.1 Pro Preview · All Z.ai models · All Google models
More comparisons
Gemini 3.1 Pro Preview vs GPT-6 Sol · GLM 5.3 vs DeepSeek V4 Pro · GLM 5.3 vs Kimi K3 · DeepSeek V3.2 vs Gemini 3.1 Pro Preview · All comparisons