GLM 5.2 vs GLM 5.1
GLM's newest release against its immediate predecessor.
What the numbers say
- GLM 5.2 is about 1.7x cheaper on output tokens (19.4 vs 33.4 credits per 1M).
- GLM 5.2 takes noticeably more context: 1.0M vs 203K tokens.
- GLM 5.2 is the newer release (June 2026 vs April 2026).
Derived from the live registry Zeplik routes and bills against. Credits: 1 credit = $0.10, raw provider rate with a 1.10x margin.
Side by side
GLM 5.2
Z.ai
GLM 5.2 is a large-scale reasoning model from Z.ai. It supports text input and output with a 1M-token context window, and is suited for long-horizon agent workflows, project-level software engineering,...
- Provider
- Z.ai
- Context window
- 1.0M tokens
- Input price
- 5.9 credits / 1M tokens ($0.54 raw)
- Output price
- 19.4 credits / 1M tokens ($1.76 raw)
- Vision (image input)
- No
- Tool calling
- Yes
- Extended reasoning
- No
Best for
- Everyday chat and drafting on an open-weight model with transparent lineage
- Very long documents and codebases: a 1.0M-token window fits entire books or repositories in one conversation
- Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows
GLM 5.1
Z.ai
GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks. Unlike previous models built around minute-level interactions, GLM-5.1 can work independently and continuously on...
- Provider
- Z.ai
- Context window
- 203K tokens
- Input price
- 10.6 credits / 1M tokens ($0.97 raw)
- Output price
- 33.4 credits / 1M tokens ($3.04 raw)
- Vision (image input)
- No
- Tool calling
- Yes
- Extended reasoning
- No
Best for
- Everyday chat and drafting on an open-weight model with transparent lineage
- Long documents: the 203K-token window holds lengthy reports, contracts or papers whole
- Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows
Try both on Zeplik
The honest answer to most model debates is to run your own prompt on both. Zeplik puts GLM 5.2 and GLM 5.1 in the same chat, so you can switch mid-conversation and compare answers on the work you actually do.