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GLM-5.1 versus GLM-5.3-Flash on price, context, and capabilities. Both are in the GLM group. Costs use a shared reference workload. Prices from Models.dev. Data last refreshed Oct 14, 2026, 05:43 PM UTC.

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GLM · canonical pair

GLM-5.1vsGLM-5.3-Flash

Alphabetical by model id, so this URL is the one to index. GLM-5.1 is zhipuai/glm-5.1. GLM-5.3-Flash is zhipuai/glm-5.3-flash. Both are among the models the most providers list, inside the GLM group.

A

GLM-5.1

$15.00

per month at the reference workload

vs

100 requests a day, 2,000 input tokens and 500 output tokens, no cache hits. A light chat workload so the rate cards are comparable.
SpecGLM-5.1GLM-5.3-Flash
Monthly, reference workload$15.00$1.65
Input / 1M$1.40$0.15
Output / 1M$4.40$0.50
Cache read / 1M$0.26$0.03
Cache write / 1M$0$0
Context200,0001,000,000
Max output131,072131,072
ReasoningYesYes
Tool callsYesYes
VisionNoYes
Open weightsYesYes
Providers4573
Released2026-04-072026-08-26

Same workload, your numbers

Prices are USD per 1M tokens. A month is 30 days. Cache hits use the cache-read rate when the model has one; otherwise the cache field is ignored.

Estimated monthly cost

GLM-5.1

$15.00

GLM-5.1 costs $13.35 more per month than GLM-5.3-Flash at these inputs.

monthly = requests/day × 30 × (input tokens × (1 − cache hit) × input price + input tokens × cache hit × cache-read price + output tokens × output price) ÷ 1,000,000