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Z.AI

GLM-5.3

glm-5.3

60Index
ClosedGenerally available1M context753BText

Pick this when

Frontier-class coding at a mid-tier API bill.

Skip when

You need multimodal input or weights you can host.

Ties Kimi K3 on the composite. Zhipu reports a lead on vulnerability spotting. Treat vendor security benches as claims until replicated.

Price

Input / 1M
$1.40
Output / 1M
$4.40
Measured task
$0.68

API only. Weights not released as of 28 Aug 2026.

Shape

Context
1M
Max output
64K
Released
2026-08-18
Tools
Yes
Reasoning
Yes

Scores

Intelligence index60
GPQA Diamond90
Terminal-Bench 2.182
Agentic index41
Arena
—
Speed
95/s
GPQA
90.1%
Term.
82.4%
  • AA Index. The single number most people mean by “how smart.” It is a blend, so a specialist can lose here and still win the job you care about.
  • GPQA. A clean test of hard reasoning. PhD experts sit around 65%. It says little about writing, tools, or taste.
  • Term.. Closest public proxy for coding agents that live in a terminal. A high index score with a weak terminal score is a warning.
  • Arena. Captures taste and usefulness that unit tests miss. Sample size varies by model, so treat gaps under ~100 Elo as noise.

Z.AI · Beijing. GLM. 5.3 matches Kimi on the composite at a lower API price. Weights are not public, so this is still a rental.

Compiled 2026-08-28 from public Artificial Analysis, LMSYS-style arena, and first-party price sheets. Scores move. Recheck before you spend.

A two-point gap on the intelligence index is noise for most work. Cost per finished task is the number that shows up on the invoice.