GLM 5.3 FlashX vs Gemini 3.5 Flash: price, context window and capabilities
GLM 5.3 FlashX (z-ai/glm-5.3-flashx) from Z.ai and Gemini 3.5 Flash (google/gemini-3.5-flash) from Google are both multimodal language models on the OceanToken API. GLM 5.3 FlashX costs less per token than Gemini 3.5 Flash: $0.37 against $1.35 per 1M input tokens (73% less) and $1.25 against $8.10 per 1M output tokens (85% less). Gemini 3.5 Flash 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, image input and video input; only Gemini 3.5 Flash also lists structured outputs, file input and audio input.
Side by side
| Spec | GLM 5.3 FlashX | Gemini 3.5 Flash −10% |
|---|---|---|
| Model | GLM 5.3 FlashXz- | Gemini 3.5 Flashgoogle/ |
| 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 | $0.37 / 1M tokens | $1.35 / 1M tokens |
| Output price | $1.25 / 1M tokens | $8.10 / 1M tokens |
| Cached input price | $0.09 / 1M tokens | $0.15 / 1M tokens |
| Cache write price | – | $1.583 / 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 | Not listed | Yes |
About these prices
Which should you choose?
- Choose GLM 5.3 FlashX to spend less per token: 73% less for input and 85% less for output than Gemini 3.5 Flash.
- Context size does not separate them: both hold about 1.05M tokens.
- Choose Gemini 3.5 Flash if you need structured outputs, file input and audio input: GLM 5.3 FlashX 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 FlashX Gemini 3.5 Flash
Frequently asked questions
Which is cheaper, GLM 5.3 FlashX or Gemini 3.5 Flash?
GLM 5.3 FlashX. GLM 5.3 FlashX costs less per token than Gemini 3.5 Flash: $0.37 against $1.35 per 1M input tokens (73% less) and $1.25 against $8.10 per 1M output tokens (85% less). Gemini 3.5 Flash 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 FlashX or Gemini 3.5 Flash?
Neither. Both have a 1.05M-token context window (1,048,576 tokens).
Can I call both GLM 5.3 FlashX and Gemini 3.5 Flash 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-flashx or google/gemini-3.5-flash.
Models and publishers
GLM 5.3 FlashX · Gemini 3.5 Flash · All Z.ai models · All Google models
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