GLM 5.1 API

Zhipu's GLM 5.1, through an OpenAI-compatible API. Providers quote it on an open exchange, and each request goes to the offer with the lowest estimated charge that meets your rules.

Providers compete for each request. The exchange ranks the offers that meet your rules by estimated charge. It fixes your maximum charge before the first token, and you pay for the tokens that the model uses.
The OpenAI and Anthropic APIs. Use the OpenAI or Anthropic SDK that you have. Set the base URL and your key, and send glm-5.1 as the model.
Your data rules. Send x-liquid-retention: none and only offers whose provider does not keep your content compete for the request.

Facts

Model name: glm-5.1
Maker: Zhipu
Context window: 8,000 tokens
Input price: $0.825 per million tokens
Output price: $3.301 per million tokens
Providers: 1 independent provider
Regions: global

Providers

EmpirioLabs AI: global, $0.825 input and $3.301 output per million tokens, $0.165 cache read per million tokens, 8,000 tokens of context

Scores

HLE: 30.1, #80 of 273
GPQA: 86.8, #61 of 250
AA-LCR: 73.7, #99 of 237
SciCode: 44.8, #81 of 123
Terminal-Bench Hard: 43.2, #22 of 166
τ²-Bench: 97.7, #9 of 169
IFBench: 76.3, #12 of 178
SimpleQA Verified: 34.0, #63 of 126

Scores: Artificial Analysis (https://artificialanalysis.ai/)

Scores: Epoch AI, 'Capabilities & Benchmarking' (https://epoch.ai/benchmarks)

Request

curl https://router.inference.ai.exchange/v1/chat/completions \
  -H "Authorization: Bearer $LIQUID_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "glm-5.1",
    "messages": [{"role":"user","content":"Say hello."}]
  }'

Questions

What is GLM 5.1?: Served by intent-router: each job goes to the cheapest healthy upstream for this model.
How much does GLM 5.1 cost?: Offers now ask $0.825 per million input tokens and $3.301 per million output tokens. A job pays for the tokens it uses. The exchange picks the cheapest eligible offer.
What is the context length of GLM 5.1?: The largest offer takes 8,000 input tokens. A smaller offer can take less. The exchange skips an offer that cannot take your message.
What can GLM 5.1 do?: Its providers list Reasoning budget, Reasoning effort, JSON object, Repetition penalty, Stop sequences, Top-k sampling, Top-p sampling, Text, Tools.
What inputs and outputs does GLM 5.1 support?: Text → Text.
Which providers serve GLM 5.1?: 1 independent provider quote it now, with 1 offer. The table above ranks them by the cost of a typical job.
How do I call GLM 5.1?: Send "glm-5.1" as the model in an OpenAI or Anthropic request. The API section links to setup steps for each client.
When was GLM 5.1 listed?: The exchange first listed it on 10/8/2026. This is not its release date.