StepFun: Step 3.5 Flash
stepfun/step-3.5-flash
Cheapest provider
$0.09 / 1M
DeepInfra
Fastest provider (p95)
84 tok/s
SiliconFlow
Intelligence (estimated)
52.5
Family + generation + popularity + price tier
Per-provider performance
Latency / throughput / uptime / price measured across providers over the last 30 minutes of live traffic. This is what proves “sourced cheapest” — Atlas mode draws on these per call to serve the cheapest path that holds quality.
| Provider | Quant | Input $/1M | Output $/1M | Latency p50 / p95 | Throughput p50 / p95 | Uptime 30m | Success |
|---|---|---|---|---|---|---|---|
| DeepInfra | q8· fp8 | $0.0900 | $0.3000 | 819ms / 11990ms | 34 / 47 tok/s | 99.14% | 95.6% |
| SiliconFlow | q8· fp8 | $0.1000 | $0.3000 | 2636ms / 6996ms | 58 / 84 tok/s | 99.91% | 99.9% |
“—” means live telemetry hasn’t accumulated enough recent traffic for that endpoint. “undisclosed” means the provider serves the model but doesn’t expose the quantization label (typically running fp8 / int8 internally).
Intelligence estimate
No public benchmark numbers indexed for this model yet, so the leaderboard score is derived from the catalogue data we sync: model family standing, generation, and live usage rank — applied identically to open- and closed-weight models. The heuristic ceiling sits below confirmed-benchmark frontier models so curated rankings stay clearly on top.
- ·unknown family base
- ·v3.5 generation +3
Want a curated score? File a benchmark report and we’ll add it to the next sync.
How Atlas mode sources StepFun: Step 3.5 Flash
- Strict mode — pin StepFun: Step 3.5 Flash exactly and we pass it straight through, sourced from the cheapest provider above. The same model, no substitutions — currently DeepInfra at $0.09/1M.
- Atlas mode — the default. Each call is auto-optimized for the cheapest path that holds quality, at least 5% off going direct from call one and climbing as it ramps. You always see which model served the call and exactly what you saved — thumbs-down anything you don’t like for a full refund.