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Z.ai: GLM 5.3 Flash vs Z.ai: GLM 5.3 Prime

Z.ai: GLM 5.3 Flash is 81.7× cheaper for the sample workload; Z.ai: GLM 5.3 Flash has the larger context window.

MetricZ.ai: GLM 5.3 FlashZ.ai: GLM 5.3 Prime
Model IDz-ai/glm-5.3-flashz-ai/glm-5.3-prime
Prompt price$0.018 / 1M tokens$2.80 / 1M tokens
Completion price$0.1402 / 1M tokens$8.80 / 1M tokens
Context1,048,576 tokens1,000,000 tokens
Tool calling✓✓
Structured outputs✓–
Reasoning✓✓
Response format✓✓
Web search––
Input modalitiestext, image, videotext
Output modalitiestexttext
Added2026-08-262026-09-23

Sample workload

Chat app: 1,000 prompt + 500 completion tokens × 100 requests per day.

CostZ.ai: GLM 5.3 FlashZ.ai: GLM 5.3 Prime
Per day$0.0088$0.72
Per 30 days$0.26$21.60

Difference: $0.71 per day and $21.34 per 30 days.

Z.ai: GLM 5.3 Flash detailsZ.ai: GLM 5.3 Prime detailsOpen in the live compare viewTry your own workload

Data updated 2026-10-30