Sources & verification notes

GLM-5.1

• Exact identifier & access

  Identity and lifecycle apply to this exact identifier and serving surface.

  • GLM-5.1 model card (Hugging Face) ↗Z.ai (Hugging Face zai-org) · provider-authored · checked Oct 1, 2026

• First availability

  Effective Apr 7, 2026. Checked Oct 1, 2026.

  Date taken from the cited Z.ai page; the Hugging Face upload timestamp was not used.

  • GLM-5.1: Towards Long-Horizon Tasks (Z.ai blog) ↗Z.ai · provider-authored · checked Oct 1, 2026

• Availability status

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  Repository is listed publicly in the zai-org Hugging Face organization.

  • GLM-5.1 model card (Hugging Face) ↗Z.ai (Hugging Face zai-org) · provider-authored · checked Oct 1, 2026

• Capabilities & limits

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  The model card states no context length, so this is config.json max_position_embeddings (202,752). The card does not document tool calling. No maximum output or structured-output support is stated.

  • GLM-5.1 model card (Hugging Face) ↗Z.ai (Hugging Face zai-org) · provider-authored · checked Oct 1, 2026

• Input price

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  Downloadable weights; no Z.ai per-token price applies.

  • GLM-5.1 model card (Hugging Face) ↗Z.ai (Hugging Face zai-org) · provider-authored · checked Oct 1, 2026

• Output price

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  Downloadable weights; no Z.ai per-token price applies.

  • GLM-5.1 model card (Hugging Face) ↗Z.ai (Hugging Face zai-org) · provider-authored · checked Oct 1, 2026

• Reference price

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  The developer's own API price for glm-5.1, which serves this model (https://huggingface.co/zai-org/GLM-5.1). The model card says to use GLM-5.1 API services on docs.z.ai/guides/llm/glm-5.1, and the launch post links this repo.

  • Z.ai Open Platform API pricing for glm-5.1 ↗Z.ai · provider-authored · checked Oct 1, 2026

• Model card

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  • GLM-5.1 model card (Hugging Face) ↗Z.ai (Hugging Face zai-org) · provider-authored · checked Oct 1, 2026
  • GLM-5 GitHub README (model download table) ↗Z.ai · provider-authored · checked Oct 1, 2026

• Official announcement

  Effective Apr 7, 2026. Checked Oct 1, 2026.

  • GLM-5.1: Towards Long-Horizon Tasks (Z.ai blog) ↗Z.ai · provider-authored · checked Oct 1, 2026

• Provider description

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  • GLM-5.1 model card (Hugging Face) ↗Z.ai (Hugging Face zai-org) · provider-authored · checked Oct 1, 2026

• License

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  • GLM-5.1 model card (Hugging Face) ↗Z.ai (Hugging Face zai-org) · provider-authored · checked Oct 1, 2026