ImprovementModels ·
GLM 5.3 and GLM 5.3 Flash
Try in the builder
Create an agent or open an existing agent in the builder, then follow the steps below. Model and feature availability may depend on your plan.
What it does
Z.ai's latest pair joined the model selector — 5.3 for hard reasoning and tool use, 5.3 Flash for the same work at speed, with images on top.
Why it matters
A million tokens of context and Actions support on every plan, which is not a combination the frontier tiers offer.
The specs
Both are open models reached through OpenRouter, and they share a context budget — the split between them is speed and whether the model can see.
- Context
- 1,048,576 tokens in, up to 131,072 out, on both.
- Input
- GLM 5.3 is text only. GLM 5.3 Flash also takes images.
- Actions
- Supported on both.
- Reasoning
- Fast ($$), Smartest ($$$$), or Maximum ($$$$$) — they skip the middle tier.
- Plans
- Every plan.