AI Desk · AI FingerprintingNew arrival
Why high: an exact fingerprint shared with 8 models.
Z.ai: GLM 5.3 Prime is Z.ai's model, and its measured tokenizer sits in Z.ai's own signature group alongside its sibling models. Measured models from Aion Labs carry the same vocabulary, which reads as reuse of Z.ai's tokenizer line and questions nobody's authorship; they are listed under "Shares this fingerprint" below.
| We checked | What we found | Where it came from |
|---|---|---|
| How it counts tokens | Counts every one of the 50 test strings exactly like 8 other models | tk_133b086c |
| How its API is set up | A combination of settings no other listing in the catalogue uses | api_1269e388 |
| How much it can read and write | Reads up to 1,000,000 tokens at once, writes up to 131,072 | its own listing |
| Whether it thinks before answering | Always reasons, and cannot be turned off, at max, high, low, max by default | its own listing |
| Who served our requests | Alibaba | we measured it, 5 October 2026 |
Click a row to open the full comparison.
We sent Z.ai: GLM 5.3 Prime fifty short pieces of text and recorded what each one cost it in tokens. The bars below are those costs. Two models built on the same tokenizer produce the same bars; a model built on a different one produces a different set, which is what makes this a fingerprint.
Overhead subtracted: 12 prompt tokens.
GLM-5.3-Prime is the high-speed variant of Z.ai's GLM-5.3, inheriting its full capabilities while delivering 1.5–2× the output throughput through inference acceleration. It supports text input and output with a 1M-token...
Supported parameters
frequency_penaltyinclude_reasoninglogprobsmax_tokenspresence_penaltyreasoningreasoning_effortresponse_formatseedstoptemperaturetool_choicetoolstop_ktop_logprobstop_p
defaults: {"temperature":1,"top_p":0.95}
