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

Z.ai: GLM 5.3 Flash is 11.3× cheaper for the sample workload; both have the same context window.

MetricZ.ai: GLM 5.3 FlashZ.ai: GLM 5.3 FlashX
Model IDz-ai/glm-5.3-flashz-ai/glm-5.3-flashx
Prompt price$0.018 / 1M tokens$0.37 / 1M tokens
Completion price$0.1402 / 1M tokens$1.25 / 1M tokens
Context1,048,576 tokens1,048,576 tokens
Tool calling✓✓
Structured outputs✓–
Reasoning✓✓
Response format✓✓
Web search––
Input modalitiestext, image, videotext, image, video
Output modalitiestexttext
Added2026-08-262026-09-18

Sample workload

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

CostZ.ai: GLM 5.3 FlashZ.ai: GLM 5.3 FlashX
Per day$0.0088$0.0995
Per 30 days$0.26$2.99

Difference: $0.0907 per day and $2.72 per 30 days.

Data updated 2026-10-30