of Qwen3.8 27B's tool calls fail on Cerebras (fp16).
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.
| # | Provider | Broken tool calls | Tool calls a day | $ in / out per M | Tokens/s | Uptime |
|---|---|---|---|---|---|---|
| 1 | Darkbloomfp4# | 0.07% | 3.9k | $0.04 / $2.20 | 43 | 98.9% |
| 2 | Venicefp8# | 0.26% | 43k | $0.45 / $3.20 | 100 | 100.0% |
| 3 | ModelRun [by Modular]fp4# | 0.28% | 116k | $0.20 / $2.50 | 139 | 99.6% |
| 4 | CoreWeavefp8# | 0.29% | 94k | $0.40 / $3.00 | 46 | 99.9% |
| 5 | DekaLLM# | 0.40% | 70k | $0.04 / $2.50 | 71 | 99.9% |
| 6 | Cloudflare# | 0.40% | 1.4k | $0.45 / $3.20 | 42 | 99.7% |
| 7 | Reka AIfp8# | 0.62% | 28k | $0.04 / $2.20 | 45 | 100.0% |
| 8 | DeepInfrabf16# | 0.66% | 129k | $0.15 / $1.88 | 41 | 99.6% |
| 9 | Phala# | 0.86% | 47k | $0.20 / $2.50 | 67 | 99.1% |
| 10 | Mancerfp8# | 0.93% | 1.5k | $0.18 / $2.50 | 56 | 95.4% |
| 11 | Chutesfp8# | 1.00% | 245k | $0.04 / $1.25 | 28 | 99.9% |
| 12 | AkashMLfp8# | 1.00% | 9.2k | $0.23 / $1.98 | 43 | 99.1% |
| 13 | NEAR AIfp8# | 1.00% | 112k | $0.04 / $1.35 | 24 | 99.8% |
| 14 | Parasailfp8# | 1.02% | 30k | $0.24 / $2.20 | 88 | 99.9% |
| 15 | Waferfp8# | 1.06% | 62k | $0.06 / $2.30 | 63 | 99.8% |
| 16 | Tenstorrentfp4# | 1.19% | 15k | $0.15 / $1.50 | 62 | 94.0% |
| 17 | Modal# | 1.38% | 124k | $0.04 / $2.30 | 124 | 100.0% |
| 18 | Ionstreamfp8# | 1.49% | 15k | $0.04 / $1.95 | 43 | 98.9% |
| 19 | Alibaba Cloud Int.# | 2.44% | 84k | $0.42 / $2.55 | 43 | 97.5% |
| 20 | NovitaAI# | 4.41% | 14k | $0.42 / $3.00 | 41 | 99.7% |
| 21 | Cerebrasfp16# | 13.98% | 17k | $0.99 / $1.49 | 494 | 99.8% |
Recommended OpenRouter settings for Qwen3.8 27B
{
"provider": {
"order": [
"darkbloom/fp4",
"venice/fp8",
"modelrun/fp4"
],
"ignore": [
"novita",
"cerebras/fp16"
]
}
}Point your agent at llms.txt
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And which provider to use.
For model makers
Broken tool calls carry your model's name
Releasing a model? Test it before launch.
as often on Cerebras (fp16) as on Darkbloom (fp4), its best provider.
broken tool calls a day across its 21 providers.