Sources & verification notes

GLM-5.1

• Exact identifier & access

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

  • Z.AI Developer Document: Pricing ↗Z.ai · provider-authored · checked Oct 1, 2026
  • Z.AI Developer Document: GLM-5.1 ↗Z.ai · provider-authored · checked Oct 1, 2026

• First availability

  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
  • Z.AI Developer Document: New Released (release notes) ↗Z.ai · provider-authored · checked Oct 1, 2026

• Availability status

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

  Listed as a current model code in the Z.ai documentation.

  • Z.AI Developer Document: Pricing ↗Z.ai · provider-authored · checked Oct 1, 2026

• Capabilities & limits

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

  • Z.AI Developer Document: GLM-5.1 ↗Z.ai · provider-authored · checked Oct 1, 2026

• Input price

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

  Derived from the captured rate card's standard token row.

  • Z.AI Developer Document: Pricing ↗Z.ai · provider-authored · checked Oct 1, 2026

• Output price

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

  Derived from the captured rate card's standard token row.

  • Z.AI Developer Document: Pricing ↗Z.ai · provider-authored · checked Oct 1, 2026

• Model card

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

  • Z.AI Developer Document: GLM-5.1 ↗Z.ai · 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.

  • Z.AI Developer Document: GLM-5.1 ↗Z.ai · provider-authored · checked Oct 1, 2026

• Provider comparison

  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

• Full rate card

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

  USD per 1M tokens as published on the Z.ai international documentation pricing page.

  • Z.AI Developer Document: Pricing ↗Z.ai · provider-authored · checked Oct 1, 2026

• License

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

  Not verified. These sources establish the identifier, not this missing fact.

  • Z.AI Developer Document: Pricing ↗Z.ai · provider-authored · checked Oct 1, 2026
  • Z.AI Developer Document: GLM-5.1 ↗Z.ai · provider-authored · checked Oct 1, 2026