Z.ai › GLM 5.1 › Pricing

GLM 5.1 pricing

API list price by Z.ai · checked Oct 26, 2026
Benchmarks and alternatives →
$1.40 / $4.40per 1M tokens in / out
$0.26cache read · −81%
$0.75per task at thinking?
#158on OpenRouter by tokens · 23.2B / week

Price sheetper 1M tokens

Input$1.40list
Output$4.40
Cache read$0.26−81% vs input
Context · max output203K · 131Ktokens
introductory price; end date not published

Where to buy11 providers · per 1M tokens

ProviderInputOutputContext
lab-qwen$0.82$3.30—
Chutes$0.98$3.08203K
DeepInfra$1.05$3.50—
SiliconFlow$1.19$3.74205K
Phala$1.21$4.20203K
AtlasCloud$1.26$3.96203K
Alibaba$1.33$4.18203K
Novita$1.38$4.40205K
Friendli$1.40$4.40203K
GMICloud$1.40$4.40203K
Nebius$1.40$4.40203K

In Z.ai's line-upper 1M in / out

GLM-4-Long$1 / $1−53%
GLM-4.5-AirX$1.10 / $4.50−9%
GLM-4.1V-Thinking-FlashX$2 / $2−7%
GLM 5.1$1.40 / $4.40this model
GLM 5.3$1.40 / $4.400%
GLM 5.2 Fast Preview$2.20 / $7.70+66%
GLM-4.5-X$2.20 / $8.90+80%
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All GLM API prices →

Cheaper for the same workvs GLM 5.1

GPT-6.1 Sol xhigh-48%score +96%$0.39
GPT-6.1 Terra max-46%score +85%$0.40
MiMo v2.6 Pro thinkingOpen-82%score +78%$0.13
DeepSeek V4.1 Flash 1017 maxOpen-65%score +73%$0.26
GPT-6 Sol xhigh-30%score +70%$0.52
All alternatives and what breaks when you switch →

Pricing questions

How much does GLM 5.1 cost?›

$1.40 per 1M input tokens and $4.40 per 1M output tokens. Cached input is $0.26. One Intelligence Index task costs about $0.75 at the default effort.

Is GLM 5.1 free to use?›

There is no free API tier, but the weights are open: you can run it on your own hardware for the cost of compute.

How much does prompt caching save?›

Cache reads cost $0.26 per 1M, 81% below the input price.

Is GLM 5.1 cheaper than GLM 5?›

No: $1.40 / $4.40 against $1 / $3.20, 39% more per token.

What is a cheaper alternative to GLM 5.1?›

GPT-6.1 Sol at xhigh effort costs -48% per task with a score +96% on Humanity's Last Exam.