GLM 5.3 Flash vs Gemini 3.1 Pro Preview: price, context window and capabilities
GLM 5.3 Flash (z-ai/glm-5.3-flash) from Z.ai and Gemini 3.1 Pro Preview (google/gemini-3.1-pro-preview) from Google are both multimodal language models on the OceanToken API. GLM 5.3 Flash costs less per token than Gemini 3.1 Pro Preview: $0.15 against $1.80 per 1M input tokens (92% less) and $0.50 against $10.80 per 1M output tokens (95% 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, structured outputs, image input and video input; only Gemini 3.1 Pro Preview also lists file input and audio input.
Side by side
| Spec | GLM 5.3 Flash | Gemini 3.1 Pro Preview −10% |
|---|---|---|
| Model | GLM 5.3 Flashz- | Gemini 3.1 Pro Previewgoogle/ |
| Publisher | Z.ai | |
| Kind | Text, vision & video | Text, vision, audio & video |
| Context window | 1.05M tokens1,048,576 | 1.05M tokens1,048,576 |
| Input price | $0.15 / 1M tokens | $1.80 / 1M tokens |
| Output price | $0.50 / 1M tokens | $10.80 / 1M tokens |
| Cached input price | $0.03 / 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, images and video | 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 Flash to spend less per token: 92% less for input and 95% 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 file input and audio input: GLM 5.3 Flash 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 Flash Gemini 3.1 Pro Preview
Frequently asked questions
Which is cheaper, GLM 5.3 Flash or Gemini 3.1 Pro Preview?
GLM 5.3 Flash. GLM 5.3 Flash costs less per token than Gemini 3.1 Pro Preview: $0.15 against $1.80 per 1M input tokens (92% less) and $0.50 against $10.80 per 1M output tokens (95% 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 Flash 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 Flash 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-flash or google/gemini-3.1-pro-preview.
Models and publishers
GLM 5.3 Flash · Gemini 3.1 Pro Preview · All Z.ai models · All Google models
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