Model comparison
GLM-5.1 vs GLM-5
- Input
- $1.40 / 1M tokens
- Output
- $4.40 / 1M tokens
- Context
- 200K
- Released
- 2026-04-07
- Input
- $1.00 / 1M tokens
- Output
- $3.20 / 1M tokens
- Context
- 200K
- Released
- 2026-02-11
GLM-5.1 scores higher on 3 of the 3 benchmarks both models report; GLM-5 is cheaper on input tokens ($1 vs $1.4 per 1M, 1.4×).
Specs and pricing side by side
| Spec | GLM-5.1 | GLM-5 |
|---|---|---|
| Maker | Z.ai (Zhipu / GLM) | Z.ai (Zhipu / GLM)same |
| Released | 2026-04-07 | 2026-02-11 |
| Context window | 200K | 200Ksame |
| Max output | 128K | 128Ksame |
| Input price | $1.40 / 1M tokens | $1.00 / 1M tokens |
| Output price | $4.40 / 1M tokens | $3.20 / 1M tokens |
| Parameters | ~754B total, 40B active (MoE) | 744B total / 40B active (MoE) |
| License | MIT | MITsame |
| Weights | Open weights | Open weightssame |
| Modalities | Text | Textsame |
Not published by either maker: knowledge cutoff.
Benchmarks both models report
| Benchmark | GLM-5.1 | GLM-5 |
|---|---|---|
| AIME 2026 | 95.3% | 92.7% |
| GPQA-Diamond | 86.2% | 86% |
| BrowseComp | 68% | 62% |
Scores are as published by each maker or its cited source; harness, reasoning effort and date can differ between rows, so treat small gaps as ties. Sources are listed on each model page.
Which one should you pick?
Pick GLM-5.1 if…
- You care about AIME 2026, GPQA-Diamond, BrowseComp (it scores higher on 3 shared benchmarks).
- Your use case is: long-running autonomous coding agents that plan, execute and self-correct over many iterations.
Pick GLM-5 if…
- Cost matters: input tokens cost 1.4× less ($1 vs $1.4 per 1M).
- Your use case is: autonomous coding agents that plan, edit across many files, run tests and iterate on fixes.
FAQ
Which is better, GLM-5.1 or GLM-5?
GLM-5.1 scores higher on 3 of the 3 benchmarks both models report; GLM-5 is cheaper on input tokens ($1 vs $1.4 per 1M, 1.4×). The better pick depends on whether you value benchmark scores, price per token, context length or openness for your workload.
How much cheaper is GLM-5?
GLM-5.1: $1.40 / 1M tokens input, $4.40 / 1M tokens output. GLM-5: $1.00 / 1M tokens input, $3.20 / 1M tokens output (list API prices as published by each maker).
What are the context windows of GLM-5.1 and GLM-5?
GLM-5.1 offers 200K with up to 128K output; GLM-5 offers 200K with up to 128K output.
Is GLM-5.1 newer than GLM-5?
GLM-5.1 was released 2026-04-07; GLM-5 was released 2026-02-11.