of GLM 5's tool calls fail on Z.ai (fp8).
Updated October 29, 2026
Tool-call index
Not all models are served equally by all providers. On a typical model, the worst provider breaks tool calls 19× as often as the best. Find the best one for your agents.
| # | Model | Broken tool calls | Rank | Best on the model | Tool calls a day |
|---|---|---|---|---|---|
| 1 | GLM 5.3fp8 | 0.65% | 17 of 42 | Amazon Bedrock 0.08% | 830k |
| 2 | GLM 4.7fp4 | 0.93% | 1 of 3 | — | 1.4k |
| 3 | GLM 5.1fp8 | 1.45% | 4 of 7 | Friendli 0.00% | 12k |
| 4 | GLM 5.3 Flashfp8 | 1.63% | 24 of 34 | NextBit (fp4) 0.00% | 1.1M |
| 5 | GLM 5.2fp8 | 1.89% | 23 of 27 | Friendli 0.15% | 20k |
| 6 | GLM 5fp8 | 2.22% | 3 of 5 | GMICloud (fp8) 0.74% | 3.4k |
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And which provider to use.
For inference providers
Tool calling doesn't have to break
The same provider can handle tool calls well on one model and struggle on the next.
on GLM 5.3, its best model.
models, where Z.ai is the most reliable provider.