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Z.ai: GLM 5.1 Thinking

glm-5.1:thinking

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GLM 5.1 Thinking costs $1.26 per million input tokens and $3.95 per million output tokens, supports 200K context, and is available through the OpenAI-compatible API.

GLM-5.1 with extended thinking enabled. Ranks #1 in open source and #3 globally across SWE-Bench Pro, Terminal-Bench, and NL2Repo (as of April 2026). Excels at long-horizon tasks, running autonomously for up to 8 hours while refining strategies through thousands of iterations. Run at FP8.

Modalities

Text → Text

Input / output price

$1.26 / $3.95 per 1M

Context

200K · max output 131K

Capabilities

ReasoningTool callingOpen weights

Pricing

Billed per token actually used and deducted from your credits.

ItemUSD per 1M tokens
Input$1.26
Output$3.95
Cached input$0.233

Calculator

Drag the sliders to estimate what this model will cost.

Per request
$0.00692
Per day
$3.46
Per month (30 days)
$103.87

GLM 5.1 Thinking: input $1.2558/M · output $3.9468/M · cached input $0.2332/M

Request with these settings
curl https://api.geniusrelaygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "glm-5.1:thinking", "max_tokens": 800,
       "messages": [{"role": "user", "content": "…"}]}'

Code samples

OpenAI-compatible. Set the base URL to https://api.geniusrelaygpt.com/v1 and the model to glm-5.1:thinking.

curl https://api.geniusrelaygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "glm-5.1:thinking",
    "stream": true,
    "messages": [{"role": "user", "content": "Hello"}]
  }'

Use it in a client: Cursor · Cline · SillyTavern · Codex

Parameters

Common OpenAI parameters can be passed as-is.

temperaturetop_pmax_tokensstreamstoppresence_penaltyfrequency_penaltyseed

FAQ

How is GLM 5.1 Thinking billed?
Input is $1.26 and output is $3.95 per million tokens; cached input is $0.233. The charge for every request is listed in Usage Logs in the console.
How long is the context window?
200K tokens. In a long conversation every turn is billed for the full input, so keep the history under control.
Does it support streaming?
Yes. Add "stream": true to the request to receive server-sent events in the OpenAI format.
GLM 5.1 Thinking API pricing · GeniusRelay