SIDE BY SIDE
GLM 5.3 vs GLM 5.3 Flash
Both are GLM models. GLM 5.3 Flash was added to OpenRouter on 2026-08-26, GLM 5.3 on 2026-08-18.
| Field | GLM 5.3 | GLM 5.3 Flash |
|---|---|---|
| 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 | 944K tokens |
| Input / 1M tokens | $0.080 | $0.150 |
| Output / 1M tokens | $1.40 | $0.500 |
| Accepts | text | text, images, video |
| Produces | text | text |
| Reasoning | Yes | Yes |
| Tool use | Yes | Yes |
| Added to OpenRouter | 2026-08-18 | 2026-08-26 |
| Model ID | z-ai/glm-5.3 | z-ai/glm-5.3-flash |
Questions and answers
Which is cheaper, GLM 5.3 or GLM 5.3 Flash?
It depends on the mix: GLM 5.3 is cheaper for input ($0.080 vs $0.150), GLM 5.3 Flash for output ($0.500 vs $1.40) per million tokens. At three input tokens per output token, GLM 5.3 Flash costs less. On input, GLM 5.3 is 47% cheaper.
Which has the larger context window?
Both have a 1.05M-token context window.
What can one do that the other cannot?
Only GLM 5.3 Flash supports image input.
Answers are computed from the 2026-10-24 catalog snapshot.