Z.ai's GLM-5.3 scores 60 on the Artificial Analysis Intelligence Index, matching Kimi K3 but trailing Opus 5 (63) and Fable 5 (62)
reasoning
| Source: Techmeme | Original article
Z.ai's GLM-5.3 scores 60 on the Artificial Analysis Intelligence Index, matching Kimi K3 and trailing Opus 5 (63) and Fable 5 (62).
Z.ai’s newest language model, GLM‑5.3, has posted a score of 60 on the Artificial Analysis Intelligence Index, the independent benchmark that aggregates performance across reasoning, knowledge, mathematics and coding. The result ties the model with Moonshot AI’s Kimi K3, while trailing Opus 5 (63) and Fable 5 (62). According to the evaluator’s report dated 18 August 2026, GLM‑5.3 also improves by seven points over its predecessor, GLM‑5.2.
The rating matters because the Index has become a de‑facto yardstick for “general‑purpose” AI strength in the Nordic and broader European market. A 60 places Z.ai’s offering solidly in the top tier of reasoning‑focused models, signalling that the Chinese lab’s emphasis on always‑on reasoning and large context windows (1 million tokens) is bearing fruit. The model’s architecture now forces reasoning at low, high or max effort, with the max setting used for the benchmark, and it can generate up to 128 k tokens per request—features that could appeal to developers needing deep, multi‑step problem solving.
As we reported on 19 August 2026, GLM‑5.3’s performance on the Artificial Analysis Benchmarks marked a notable jump for Z.ai. The next steps to watch include whether Z.ai will release a version that re‑introduces a “reasoning‑off” mode, how the model fares on upcoming challenges such as the Unwritten Benchmark for abstract perceptual reasoning, and whether further score gains will close the gap with Opus 5 and Fable 5. Competitive pressure is likely to accelerate refinements in reasoning depth, token efficiency and tool integration across the leading multimodal LLMs.
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