Z.ai · Language model

GLM-5.3

A 753-billion-parameter model with downloadable weights. GLM-5.3 is the strongest open-weight model on the board right now, and there's a cheap Flash sibling too.

#10Power Rankings#6Coding#1Open-Weight Watch
MakerZ.ai
ReleasedAugust 28, 2026
API price (per 1M tokens)Not published
Open weightsYes

Best for

  • Self-hosting
  • Private deployments
  • Fine-tuning

Strengths

  • LMArena text score of 1483 (Max)
  • Open weights
  • GLM-5.3-Flash costs $0.075 / $0.25

Watch out for

  • Uses a custom license, so check it before commercial use
  • 753B parameters needs serious hardware

Ranking history

EditionPower RankingsCodingBest ValueOpen-Weight WatchImage GenerationVideo Generation
Week 39, 2026#10 (84)#6 (83)—#1 (92)——