Z.ai: GLM 5.3
Zhipu AI's mid-tier model. Long-context specialist with 1.0M window.
Scores by test
Methodology →What you need to know
GLM 5.3 distinguishes itself through high-tier reasoning and agentic capabilities, particularly in strategic analysis, tool calling, and creative problem solving. Its performance on complex technical benchmarks is significant, scoring 90.9% on GPQA Diamond and 91.1% on AIME 2025, indicating a strong aptitude for graduate-level science and advanced mathematics.
The model is highly capable across long-context windows of up to 1.3M tokens and maintains a high level of faithfulness and persona consistency. However, it struggles with safety calibration, frequently over-refusing benign requests. While it handles structured output and classification well, these are its weakest functional areas compared to its perfect scores in planning and multilingual tasks.
At a blended cost of $3.65/MTok, GLM 5.3 is positioned as a premium offering. The pricing reflects its rank as 49th out of 147 models, placing it in a tier where users pay for high-reasoning density and massive context handling rather than low-cost throughput.
Use this model for complex agentic workflows, deep strategic research, or projects requiring a massive context window and high mathematical accuracy. Skip this model if your application requires strict adherence to specific output schemas or if your users are likely to be frustrated by over-refusals of benign prompts.
Strengths — Top 3
Relative weaknesses — Bottom 3
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