GLM 5.2 vs GLM 5.1
GLM 5.2 against its immediate predecessor, at a third less per token and five times the context window.
Figures as of , read live from the model registry Zeplik bills against.
What the numbers say
- GLM 5.1 is about 1.5x cheaper on output tokens (52.8 vs 81.6 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, computed from the raw provider rate with a 1.20x margin.
Side by side
GLM 5.2
Z.ai
GLM 5.2 is a large-scale reasoning model from Z.ai.
- Provider
- Z.ai
- Context window
- 1.0M tokens
- Input price
- 0.072 credits / 1M tokens ($0.0060 raw)
- Output price
- 81.6 credits / 1M tokens ($6.80 raw)
- Vision (image input)
- No
- Tool calling
- Yes
- Extended reasoning
- No
Best for
- Hard problems where answer quality matters more than cost: strategy, analysis, difficult writing
- 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.
- Provider
- Z.ai
- Context window
- 203K tokens
- Input price
- 16.8 credits / 1M tokens ($1.40 raw)
- Output price
- 52.8 credits / 1M tokens ($4.40 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.
Frequently asked questions
- What is the difference between GLM 5.2 and GLM 5.1?
- GLM 5.1 is about 1.5x cheaper on output tokens (52.8 vs 81.6 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).
- Is GLM 5.2 or GLM 5.1 cheaper?
- GLM 5.1 is cheaper: 52.8 credits per million output tokens against 81.6. 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin.
- Which has the larger context window, GLM 5.2 or GLM 5.1?
- GLM 5.2, at 1.0M tokens against 203K.
- Can I use both GLM 5.2 and GLM 5.1 on Zeplik?
- Yes. Zeplik is a multi-model chat, so both sit behind one account and you can switch between them mid-conversation to compare answers on your own prompt.
- Do GLM 5.2 and GLM 5.1 need a paid plan?
- Both need a paid plan (Plus or above). Usage is then billed in credits from your monthly allowance.
Related comparisons
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- MiniMax M3 vs GLM 5.2Two fast-iterating challengers, MiniMax's M3 against GLM 5.2.