Z.ai: GLM 5.1

Z.ai

Z.ai: GLM 5.1 by Z.ai costs $1.40 per 1M input tokens and $4.40 per 1M output tokens, with a 205K-token context window.

Pricing

Input (per 1M tokens)

$1.40

Output (per 1M tokens)

$4.40

Cached input (per 1M)

$0.26

Specifications

Provider: Z.ai
Context window: 205K tokens
Parameters: 754B
Released: Apr 2026
Open weights: —
Frontier model: No
Hugging Face: zai-org/GLM-5.1

Benchmarks

LMArena (Chatbot Arena) Elo: 1462.8
LMArena WebDev Elo: 1507.8

Speed & latency

Time to first token

1.28s

Output speed

155 tok/s

Fastest host: novita (via vercel-ai-gateway).

Compare Z.ai: GLM 5.1 with…

Z.ai: GLM 5.1 vs o3 Mini$4.40/1M Z.ai: GLM 5.1 vs o4 Mini$4.40/1M Z.ai: GLM 5.1 vs o1-mini$4.40/1M Z.ai: GLM 5.1 vs OpenAI o4-mini high$4.40/1M Z.ai: GLM 5.1 vs Qwen3.7 Max$4.43/1M Z.ai: GLM 5.1 vs GPT-5.4 Mini$4.50/1M

FAQ

How much does Z.ai: GLM 5.1 cost?

Z.ai: GLM 5.1 is priced at $1.40 per 1M input tokens and $4.40 per 1M output tokens. Output tokens cost more than input.

What is Z.ai: GLM 5.1's context window?

Z.ai: GLM 5.1 supports a context window of 205K tokens — the maximum prompt plus response length it can handle in a single request.

Is Z.ai: GLM 5.1 open weight?

Open-weight status for Z.ai: GLM 5.1 is not recorded in our dataset.

Data as of 2026-11-01. Source: Pricing via OpenRouter API, openrouter.ai. Pricing is per 1M tokens (USD); confirm with the provider before production use.