What the evidence says
- Developer
- Z.ai
- Released
- April 7, 2026
- Domains
- Language
- Tasks
- Language modeling/generation · Question answering
- Access
- Not documented in source
- Weights
- Weights unknown
Platform facts
OpenRouter's platform listing, retrieved July 22, 2026. Routed platform prices, not first-party provider prices.
- Input price
- $0.97 per 1M tokens
- Output price
- $3.04 per 1M tokens
- Context length
- 204,800 tokens
- Listed on OpenRouter
- April 7, 2026
Common questions
What is GLM-5.1?
GLM-5.1 is a Z.ai model released April 7, 2026, according to Epoch AI's reviewed catalog record. The record classifies it under language.
How does GLM-5.1 rank on LMArena?
No board Model Gauntlet mirrors currently lists this exact model revision under a reviewed identity, so no rating is reported here.
What does GLM-5.1 cost?
OpenRouter lists it at $0.97 per million input tokens and $3.04 per million output tokens, retrieved July 22, 2026. Those are the platform's routed prices, not first-party provider prices.