Pairwise benchmark snapshot · Aug 17, 2026noindex (thin pair)
In this head-to-head showdown, StepFun: Step 3.5 Flash is more budget-friendly at $0.3/1M per 1M output tokens. Review the complete breakdown below to determine which model best fits your performance and budget requirements.
Auto-discovered from OpenRouter (stepfun/step-3.5-flash). Preview until a second source matches.
Single model data
No latency data
$0.3 / 1M output
Relative percentile scores computed across all active models in the benchmark catalog.
Each spoke is a skill. Farther from the center is better (0–100th percentile). Tap any dot to inspect details.
Category wins across reasoning intelligence, generation speed, and token cost.
Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy
Generation throughput and time to first token responsiveness
Cost per million tokens and max context window length
| Benchmark | DeepSeek V3 | StepFun: Step 3.5 Flash | Advantage Delta |
|---|---|---|---|
| Preference Elo | — | — | |
| LiveBench | — | — | |
| SWE-bench | — | — | |
| GPQA Diamond | — | — | |
| Time to first token | — | — | |
| Output speed | 66 tok/s | — | — |
| Input price | $0.2574/1M | $0.1/1M | StepFun: Step 3.5 Flash (+$0.1574/1M) |
| Output price | $1.03/1M | $0.3/1M | StepFun: Step 3.5 Flash (+$0.7287/1M) |
| Context window | StepFun: Step 3.5 Flash (+98k) |
Simulate monthly production API costs in USD (US Dollar).
StepFun: Step 3.5 Flash is estimated to save $16.44/month ($197/year).
Need SWE-bench on both sides.
Lower output list price ($0.3/1M).
Need TTFT on both sides.
Larger window (262k).
StepFun: Step 3.5 Flash is the side marked multimodal in the catalog.
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | insufficient data | Need SWE-bench on both sides. |
| High-volume chat | StepFun: Step 3.5 Flash | Lower output list price ($0.3/1M). |
| Voice / low-latency UI | insufficient data | Need TTFT on both sides. |
| Long-document RAG | StepFun: Step 3.5 Flash | Larger window (262k). |
| Screenshots / vision | StepFun: Step 3.5 Flash | StepFun: Step 3.5 Flash is the side marked multimodal in the catalog. |
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Verified head-to-head card
