Z.ai: GLM 5.3 Flash
Zhipu AI's flagship model. Long-context specialist with 1.3M window.
Scores by test
Methodology →What you need to know
GLM 5.3 Flash is defined by its ability to maintain frontier-level performance at a minimal cost. With a blended cost of $0.206 per million tokens, it provides a high-efficiency alternative for complex tasks without the typical quality degradation associated with flash-tier models. This is evidenced by its top rank among 160 models and an average internal score of 4.85/5.0.
The model excels in high-reasoning and technical tasks, scoring 5/5 across strategic analysis, tool calling, and agentic planning. Its capabilities extend into extreme context handling with a 1.3M token window and a 5/5 long-context score. External benchmarks validate this strength, specifically in high-difficulty reasoning with a 93.9% score on AIME 2025 and 90.2% on GPQA Diamond.
While the model is highly capable, it shows slight relative weaknesses in classification and constrained rewriting, where it scores 4/5. However, its Epoch Capabilities Index of 151.64 places it firmly within the frontier model range, meaning these weaknesses are marginal compared to the overall utility of the model.
Use this model if you need a low-cost, high-context solution for agentic workflows, complex tool calling, or deep strategic analysis. Skip this model if your primary requirement is highly rigid constrained rewriting or simple high-volume classification where a more specialized, smaller model might suffice.
Strengths — Top 3
Relative weaknesses — Bottom 3
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