GLM 5.1
Z.ai· released 7 Apr 2026
z-ai/glm-5.1- Input / 1M tokens
- $0.965
- Output / 1M tokens
- $3.032
Longest answer: 131K tokens
About
GLM 5.1 is a text model from Z.ai in the z-ai family, with open weights and tool support. Its listed summary highlights coding and long-horizon tasks, describing a model intended to work continuously and independently rather than only in brief interactions. It accepts text and produces text, with a 204,800-token context window and a maximum output of 131,072 tokens. Reasoning is listed as supported. The model was released on 2026-04-07; its Hugging Face identifier is zai-org/GLM-5.1, and its model ID is z-ai/glm-5.1. Pricing is 0.9646 USD per 1M input tokens and 3.0316 USD per 1M output tokens. The official listing is at https://openrouter.ai/z-ai/glm-5.1.
Who it is for
GLM 5.1 suits builders looking for an open-weight text model with tool support and a large context window, particularly for coding and extended tasks.
What is good
- Open weights are available.
- Supports tools and reasoning.
- 204,800-token context window.
- Maximum output is 131,072 tokens.
What to know first
- Output costs 3.0316 USD per 1M tokens.
- Input costs 0.9646 USD per 1M tokens.
Verdict
GLM 5.1 pairs open weights and tool support with a large context and output allowance. Its listed input and output prices make token costs a key consideration for extended use.
Details
- Lab
- Z.aiopenrouter.ai · 3 Oct 2026
- Context
- 205Kopenrouter.ai · 3 Oct 2026
- Input price
- $0.965 / 1Mopenrouter.ai · 3 Oct 2026
- Output price
- $3.032 / 1Mopenrouter.ai · 3 Oct 2026
- Max output
- 131,072 tokensopenrouter.ai · 3 Oct 2026
- Inputs
- textopenrouter.ai · 3 Oct 2026
- Open weights
- Yesopenrouter.ai · 3 Oct 2026
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See the list
Listed on Inferse
- Newest Models in 2026466 listed
- Longest-Context Models in 2026466 listed
- Cheapest Language Models in 2026437 listed
- Models with Tool Calling in 2026395 listed
- Reasoning Models in 2026332 listed
- Open-Weight Models in 2026178 listed
- Z.ai Models: Pricing per 1M Tokens and Context (2026)20 listed
Sources
- openrouter.ai/z-ai/glm-5.1· checked 3 Oct 2026