of DeepSeek V4 Pro 0813's tool calls fail on Sail Research (fp4).
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 | DeepSeek V4.1 Flash 1017fp4 | 0.03% | 1 of 35 | — | 445k |
| 2 | DeepSeek V4 Flash 0731fp4 | 0.04% | 1 of 22 | — | 95k |
| 3 | Kimi K3fp4 | 0.20% | 16 of 24 | DeepInfra (mxfp4) 0.01% | 98k |
| 4 | GLM 5.3fp8 | 0.28% | 7 of 42 | Amazon Bedrock 0.08% | 111k |
| 5 | GLM 5.3 Flashfp4 | 0.36% | 9 of 34 | NextBit (fp4) 0.00% | 61k |
| 6 | DeepSeek V4.1 Flashfp4 | 0.41% | 11 of 35 | Prime Intellect 0.06% | 429k |
| 7 | DeepSeek V4 Pro 0813fp4 | 1.06% | 13 of 21 | Ionstream 0.04% | 94k |
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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 DeepSeek V4.1 Flash 1017, its best model.
models, where Sail Research is the most reliable provider.