SIDE BY SIDE
GLM 5.3 Flash vs GLM 5.3 FlashX
Both are GLM models. GLM 5.3 FlashX was added to OpenRouter on 2026-09-18, GLM 5.3 Flash on 2026-08-26.
| Field | GLM 5.3 Flash | GLM 5.3 FlashX |
|---|---|---|
| Provider | Z.ai | Z.ai |
| Family | GLM | GLM |
| Province | Snow Country | Snow Country |
| Context window | 1.05M tokens | 1.05M tokens |
| Maximum output | 944K tokens | 131K tokens |
| Input / 1M tokens | $0.150 | $0.370 |
| Output / 1M tokens | $0.500 | $1.25 |
| Accepts | text, images, video | text, images, video |
| Produces | text | text |
| Reasoning | Yes | Yes |
| Tool use | Yes | Yes |
| Added to OpenRouter | 2026-08-26 | 2026-09-18 |
| Model ID | z-ai/glm-5.3-flash | z-ai/glm-5.3-flashx |
Questions and answers
Which is cheaper, GLM 5.3 Flash or GLM 5.3 FlashX?
GLM 5.3 Flash costs less for both input ($0.150 vs $0.370) and output ($0.500 vs $1.25) per million tokens. On input, GLM 5.3 Flash is 59% cheaper.
Which has the larger context window?
Both have a 1.05M-token context window.
What can one do that the other cannot?
Nothing among reasoning, tool use and image input: both support reasoning, tool use and image input.
Answers are computed from the 2026-10-24 catalog snapshot.