GLM 5.1

Apr 2026
GLM 5.1
Compare in
on
$1.02per task?
$1.40 / $4.40per 1M in / out?cache $0.26
72 tok/sfirst token in 1.8 s?
203Kcontext

Rankingin thinking mode?

Alternatives?

Run it yourself

estimate
Fits on✗ 8 GB (phone, laptop)✗ 16 GB✗ 24 GB GPU✗ 48 GB GPU✗ 80 GB GPU
LicenceMITfree for commercial use

History

10 versions
2025303540Jan 26Apr 26Jul 26Release dateChess Puzzles4.75.15.25.3
2025303540Jan 26Apr 26Jul 26Release dateChess Puzzles4.75.15.25.3

Benchmarks

all categories
Chat & Knowledge
SimpleQA-Verifiedlab38.1
Chinese-SimpleQAlab75
MMLU-Pro EMlab86
HMMT February 2026lab89.4
IMOAnswerBenchlab83.8
Apexlab11.5
Apex Shortlistlab72.4
GDPval-AA Elolab1,535
Coding
SciCode44.8#75
SWE-bench Pro (edition unstated)lab58.4
DeepSWE (edition unstated)lab18
Terminal Bench 2.0lab63.5
SWE Multilinguallab73.3
Agents & Tool Use
Toolathlonlab40.7
BrowseComplab79.3
HLE without toolslab34.7
HLE with toolslab50.4
MCPAtlas Publiclab71.8
Writing & Language

FAQ

How much does GLM 5.1 cost?›

$1.40 per 1M input tokens and $4.40 per 1M output tokens; cached input $0.26 per 1M; cheapest via lab-qwen at $0.82 / $3.30. A typical benchmark task costs about $1.02 at default effort.

Is GLM 5.1 free to use?›

There is no free API; the cheapest paid price is $0.82 per 1M input tokens. The weights are open, so you can run it yourself.

How good is GLM 5.1, and what is it best at?›

#80 of 334 in Chat & Knowledge, #49 of 132 in Coding, #60 of 133 in Agents & Tool Use, #29 of 195 in Writing & Language, #66 of 133 in Vision & Documents. Strongest at: Tool calling, Reasoning, Science, Knowledge, Instructions.

Is GLM 5.1 better than Kimi K2.6?›

On Chess Puzzles, GLM 5.1 scores 20 vs 20 — about the same.

How can I use GLM 5.1?›

Through the API of Alibaba, AtlasCloud, Baidu, Chutes, DeepInfra and 6 more.

What is the context window of GLM 5.1?›

203K tokens, with up to 131K output tokens.

When was GLM 5.1 released? Is there a newer version?›

Released 2026-04-07. It has been superseded by GLM 5.2.

Is GLM 5.1 open source?›

Yes, the weights are open (MIT licence).

Can I run GLM 5.1 locally?›

The weights are open and can be self-hosted; hardware needs are not confirmed yet.

Can GLM 5.1 read images?›

No, it accepts text only.

What is GLM 5.1?›

GLM 5.1 is an open-weights language model from Z.ai, released Apr 2026, the successor to GLM 5.

What are the best alternatives to GLM 5.1?›

Gemini 3.8 Flash (cheaper), Claude Haiku 5.5 (better), DeepSeek V4 Pro 0813 (open weights).