Has GLM-5.4 been officially released?
No. As of September 17, 2026, Z.ai's model overview and pricing page do not list GLM-5.4, and the glm-5.4 documentation path returns 404.
GL
GLM-5.4
Also known as: GLM 5.4 / GLM5.4
Release date: 2026-10-17Views: 16
Parameters
No data
Context length
No data
Multilingual
No data
Reasoning ability
No data
GLM-5.4 is a community name for a possible next Z.ai GLM model, attached to the anonymous Union Alpha model that appeared on September 16, 2026. As of September 17, Z.ai has not published it; specifications, pricing, and benchmarks remain unknown.
Data sourced primarily from official releases (GitHub, Hugging Face, papers), then benchmark leaderboards, then third-party evaluators. Learn about our data methodology
GLM-5.4
Model basics
Reasoning traces
Supported
Thinking modes
Thinking modes not supported
Context length
No data
Max output length
No data
Model type
Reasoning model
Modality (in / out)
No data
Release date
2026-10-17
Model file size
No data
MoE architecture
No
Total params / Active params
No data / Not applicable
Knowledge cutoff
No data
GLM-5.4
Open source & experience
Code license
Proprietary
Weights license
Proprietary
GitHub repo
N/A
Hugging Face
N/A
Live demo
N/A
GLM-5.4
Official resources
Paper
N/A
DataLearnerAI blog
N/A
GLM-5.4
API details
API speed
No data
No public API pricing yet.
GLM-5.4
Publisher
Zhipu AI
View publisher details GLM-5.4
Model Overview
Rumored and unreleased
GLM-5.4 is not a model name published by Zhipu AI / Z.ai. As of September 17, 2026, the official BigModel model overview and Z.ai pricing page list GLM-5.3 and GLM-5.3-Flash as the newest GLM-5 family models, and the glm-5.4 documentation path returns 404. There is no API model ID, price, or announcement. The catalog date is a placeholder under the unreleased-model convention, not a release date.
Where the rumor comes from
The rumor is tied to Union Alpha, an anonymous stealth model that went live on OpenRouter and OpenCode on September 16, 2026 with a 262K context window, text and image input, and tool calling. The previous stealth model released through the same channels, Ox Alpha, was confirmed by Zhipu six days later as GLM-5.3-Flash, so community discussion has speculated that Union Alpha is the next GLM release and referred to it as GLM-5.4. No specific original post could be located for citation. Union Alpha remains unclaimed, other labs such as Moonshot (Kimi) have also been suggested, and its published profile differs from GLM-5.3-Flash (no video input, no weights, a smaller context window).
Unknown fields
Z.ai has not published a parameter count, context window, modalities, tool support, reasoning modes, license, prices, or benchmark results for GLM-5.4. These fields are left empty rather than copied from GLM-5.3 or from Union Alpha. If Z.ai releases a model and confirms the Union Alpha mapping, this entry will be updated from official sources.
Sources
- Official BigModel model overview: current first-party catalog check.
- Z.ai API model page: current public API models.
- BigModel glm-5.4 documentation path: returned 404 on September 17, 2026.
- OpenRouter: Union Alpha: the anonymous model behind the rumor; provider listed as stealth.
- SCMP: Ox Alpha revealed as GLM-5.3-Flash: precedent for a stealth release.
GLM-5.4
FAQ
Is Union Alpha GLM-5.4?
Unconfirmed. Union Alpha is an anonymous stealth model on OpenRouter and OpenCode. The GLM-5.4 link is community speculation based on the Ox Alpha precedent; no lab has claimed the model.
What are GLM-5.4's specifications and prices?
None have been published. Specifications, API ID, pricing, and benchmarks stay empty until Z.ai publishes official documentation.
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