GLM API

Model APIsz.ai5 published changes

2 sources under watch

html ·https://docs.z.ai/guides/overview/pricing
html ·https://docs.z.ai/release-notes

Change timeline

Sep 18, 2026pricinghigh

Introduction of GLM-5.3-FlashX model with tiered pricing structure

Developers can now use the new GLM-5.3-FlashX model with input pricing at $0.37, output pricing at $0.075, limited-time free tier option, and batch pricing at $1.25

Evidence

+GLM-5.3-FlashX $0.37 $0.075 Limited-time Free $1.25

docs.z.ai

Sep 9, 2026pricinghigh

GLM-5.3-Flash pricing discount ended, prices reverted to full list prices

Users of GLM-5.3-Flash will now pay double the discounted rates; the 50% promotional pricing that was active until September 9, 2026 has ended.

Evidence

−$0.15 $0.075 $0.03 $0.015 $0.50 $0.25 GLM-5.3-Flash is available at a 50% discount (strikethrough prices are list prices). The promotion ends at 24:00 on September 9, 2026 (UTC+8, Singapore time).

+$0.15 $0.03 $0.50

docs.z.ai

Aug 26, 2026pricinghigh

GLM-5.3-Flash model introduced with 50% discount promotion until September 9, 2026

Users can access a new flagship model GLM-5.3-Flash at discounted rates ($0.15/$0.075 input, $0.50/$0.25 output per 1M tokens) with limited-time 50% reduction, making it more affordable during the promotional period.

Evidence

−Text Models

+Latest Models GLM-5.3-Flash $0.15 $0.075 $0.03 $0.015 Limited-time Free $0.50 $0.25 GLM-5.3-Flash is available at a 50% discount (strikethrough prices are list prices). The promotion ends at 24:00 on September 9, 2026 (UTC+8, Singapore time).

docs.z.ai

Aug 19, 2026featurehigh

GLM-5.3 released with 50% improvement in coding capabilities over GLM-5.2

Users gain significantly enhanced code generation and comprehension capabilities, reaching SOTA performance on public benchmarks including Terminal Bench 3.0.

Evidence

+Stronger Coding Capabilities: GLM-5.3 delivers a significant improvement in coding capabilities, achieving a 50% gain over GLM-5.2 on Z.ai Code Bench and reaching state-of-the-art (SOTA) performance among open-source models on public benchmarks, including Terminal Bench 3.0.

docs.z.ai

Aug 19, 2026pricinghigh

GLM-5.3 model pricing introduced with input/output costs and limited-time free offer

Developers can now use the GLM-5.3 model at $1.4 input cost, $0.26 output cost, with a limited-time free tier available and $4.4 for additional services/tier.

Evidence

+GLM-5.3 $1.4 $0.26 Limited-time Free $4.4

docs.z.ai