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Z.ai: GLM 5.1 API Pricing
GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks. Unlike previous models built around minute-level interactions, GLM-5.1 can work independently and continuously on...
How much does Z.ai: GLM 5.1 cost for a real workload?
At 10M input + 2M output tokens per month, Z.ai: GLM 5.1 costs about $22.8 ($14 input + $8.8 output). Try your own volumes in the cost calculator.
What are cheaper alternatives to Z.ai: GLM 5.1?
- OpenAI: GPT-5.1 (batch) — $0.625 in / $5 out per 1M
- OpenAI: GPT-5 (batch) — $0.625 in / $5 out per 1M
- Mistral: Mistral Large 4 — $1.36 in / $4.18 out per 1M
- Meta: Muse Spark Open — $1.25 in / $4.25 out per 1M
- Meta: Muse Spark 1.3 — $1.25 in / $4.25 out per 1M
- Meta: Muse Spark 1.2 — $1.25 in / $4.25 out per 1M
Compare Z.ai: GLM 5.1 with other models
Z.ai: GLM 5.1 vs Z.ai: GLM 5.3 FlashZ.ai: GLM 5.1 vs Z.ai: GLM 5.3 Flash (batch)Z.ai: GLM 5.1 vs Z.ai: GLM 4.7 FlashZ.ai: GLM 5.1 vs Z.ai: GLM 4.5 AirZ.ai: GLM 5.1 vs Z.ai: GLM 4.6VZ.ai: GLM 5.1 vs Z.ai: GLM 5.3
Frequently asked questions
How much does Z.ai: GLM 5.1 cost?
Z.ai: GLM 5.1 costs $1.4 per 1M input tokens and $4.4 per 1M output tokens (list price, snapshot October 21, 2026). At 10M input + 2M output tokens per month that is about $22.8.
What is the context window of Z.ai: GLM 5.1?
Z.ai: GLM 5.1 has a context window of 204,800 tokens and can return up to 131,072 output tokens per response.
What are cheaper alternatives to Z.ai: GLM 5.1?
Cheaper models include OpenAI: GPT-5.1 (batch) ($0.625 in / $5 out), OpenAI: GPT-5 (batch) ($0.625 in / $5 out), Mistral: Mistral Large 4 ($1.36 in / $4.18 out). See the full list on this page.
Is Z.ai: GLM 5.1 free to use?
No. Z.ai: GLM 5.1 is a paid model at $1.4 input / $4.4 output per 1M tokens. 20 free models are listed on the free models page.
Provider: z-ai · Model ID: z-ai/glm-5.1 · Modality: text->text · Price snapshot October 21, 2026, refreshed daily. How we collect prices