GLM 5.1 vs GLM 5.3
| Benchmark | GLM 5.1 | GLM 5.3 |
|---|---|---|
| Humanity's Last Exam | 30.1 | 36.6 |
| Terminal-Bench 4.0 | 2 | 34.8 |
| AutomationBench-AA | 20.3 | 52 |
Specs
| Spec | GLM 5.1 | GLM 5.3 |
|---|---|---|
| Input, per 1M | !$1.40 | !$1.40 |
| Output, per 1M | !$4.40 | !$4.40 |
| Cost per task? | $0.75 | $0.85 |
| Speed, tok/s | 75 | 92 |
| Context | 203K | 1M |
| Weights | Open | Open |
| Released | Apr 2026 | Aug 2026 |
| Memory (4-bit) | 452 GB | 452 GB |
| Licence | MIT | glm-5.3 |
| Commercial use | Allowed | Restricted |
| See images | — | — |
| Read PDFs | — | — |
| Hear audio | — | — |
| Watch video | — | — |
| Call tools | ✓ | ✓ |
| Force a tool call | Partial | — |
| Return strict JSON | ✓ | ✓ |
| Search the web | ? | ? |
| Run code | ? | ? |
| Use a computer | ? | ? |
What breaks when you switch
GLM 5.1 → GLM 5.3
Reasoning cannot be disabled›
Disabling reasoning is unsupported; keep reasoning enabled.
tool_choice auto · Z.ai API›
The first-party chat reference exposes only auto for tool_choice.
Complete unmodified reasoning_content›
Preserved thinking defaults on for Coding Plan and off for the standard API; when enabled, return complete unmodified reasoning_content in its original order to protect quality and cache hits.
Only one stop word›
Only one stop word is supported, so do not rely on a list of alternative stop sequences.
GLM 5.3 → GLM 5.1