Major Release Z AI · Released
GLM-5.1
What is GLM-5.1?
GLM-5.1 is a Major Release AI model from Z AI, released on April 7, 2026. It has a 200K tokens context window, costs $1.40 per million input tokens, and scores 1471 on Chatbot Arena Elo. It is available as open source.
Z AI GLM-5.1 — AA Intelligence Index 51.4, 200K tokens context, reasoning model.
How much does GLM-5.1 cost?
| Metric | Price |
|---|---|
| input per mtok | $1.40 |
| output per mtok | $4.40 |
| cache read per mtok | $0.26 |
Pricing data verified .
What context window does GLM-5.1 have?
- Context window
- 200K tokens
- Max output
- 131K
- Input modalities
- text
- Output modalities
- text
How does GLM-5.1 score on benchmarks?
| Benchmark | Score |
|---|---|
| GPQA Diamond | 86.8% |
| HLE | 28.0% |
| SciCode | 43.8% |
| TAU2-bench | 97.7% |
| TerminalBench-Hard | 43.2% |
| IF-Bench | 76.3% |
| LiveCodeBench Reasoning | 62.3% |
| AA Intelligence Index | 51.4 |
| Chatbot Arena Elo | 1471 |
Benchmark scores verified .