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?

Full ranking →
1GPT-5.573.72GPT-5.436.63Opus 4.835.74DeepSeek V4.1 Flash 101719.65Kimi K2.615.6
···
10Step 3.7 Flash10.711GLM 5.16.512Opus 4.65.8

Strong at

S
Tool calling#9 of 242Instructions#14 of 245
A
Reasoning#80 of 334Science#61 of 312Knowledge#65 of 318
B
Coding#49 of 132Agents & work tasks#62 of 175Long context#97 of 273

Alternatives?

ModelScoreCostPer taskWhat changes
CheaperDeepSeek V4.1 Flash 1017maxOpensame-76%$0.30 / $1.20Memory (4-bit): 452 GB → 458 GB+5BetterGPT-5.5xhighwins 60%+423%$2.63Prompts with >272K input tokensCheaperKimi K2.6unstatedOpensame-20%$0.95 / $4Memory (4-bit): 452 GB → 616 GBCheaperDeepSeek V4 Pro 0813maxOpensame-8%$1.32 / $3.96Memory (4-bit): 452 GB → 990 GB+5CheaperGLM 5unstatedOpensame-28%$1 / $3.20

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
681012Apr 26Release dateMathArena · BrokenArXiv March 202655.15.2
681012Apr 26Release dateMathArena · BrokenArXiv March 202655.15.2

Benchmarks

in Chat & Knowledge
AA Intelligence Index 4.3.226.1#75
AA Omniscience Index0.9#65
AA Omniscience · Accuracy23.7#124
AA Omniscience · Hallucination Rate29.9#34
Humanity's Last Exam30.1#80
GPQA Diamond86.8#61
AA-LCR (long context) 1.173.7#97
IFBench (instructions)76.3#14
CritPt (physics)4.6#81
GDP.pdf · AA all-pass8.4#66
MMLU-Pro EMlab86
SimpleQA-Verifiedlab38.1
Chinese-SimpleQAlab75
HMMT February 2026lab89.4
IMOAnswerBenchlab83.8
Apexlab11.5
Apex Shortlistlab72.4
GDPval-AA Elolab1,535

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 GLM 5?›

On MathArena · BrokenArXiv · March 2026, GLM 5.1 scores 6.5 vs 12.1 — 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?›

DeepSeek V4.1 Flash 1017 (cheaper), GPT-5.5 (better).