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Anthropic: Claude Opus 5.5 vs Z.ai: GLM 5.3 Prime

Z.ai: GLM 5.3 Prime is 1.9× cheaper for the sample workload; both have the same context window.

MetricAnthropic: Claude Opus 5.5Z.ai: GLM 5.3 Prime
Model IDanthropic/claude-opus-5.5z-ai/glm-5.3-prime
Prompt price$4.00 / 1M tokens$2.80 / 1M tokens
Completion price$20.00 / 1M tokens$8.80 / 1M tokens
Context1,000,000 tokens1,000,000 tokens
Tool calling✓✓
Structured outputs✓–
Reasoning✓✓
Response format✓✓
Web search––
Input modalitiestext, image, filetext
Output modalitiestexttext
Added2026-09-222026-09-23

Sample workload

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

CostAnthropic: Claude Opus 5.5Z.ai: GLM 5.3 Prime
Per day$1.40$0.72
Per 30 days$42.00$21.60

Difference: $0.68 per day and $20.40 per 30 days.

Data updated 2026-10-30