Benchmarks
independent evaluations · source: Artificial Analysis and Hugging Face leaderboards| Benchmark | Best score | Effort | Cost / task | |
|---|---|---|---|---|
| AIME 2026 | 97% | default | — | |
| CritPt | 2% | default | — | |
| GPQA Diamond | 83% | default | — | |
| Humanity's Last Exam | 24% | default | — | |
| IFBench | 67% | default | — | |
| Long-Context Reasoning | 63% | default | — | |
| Omniscience | -44.2 | default | — | |
| Omniscience Accuracy | 0.2 | default | — | |
| Omniscience Non Hallucination | 0.1 | default | — | |
| SciCodeArtificial Analysis did not report this score in its latest run on Oct 14, 2026 | 39% | — | — | |
| SWE-bench Verified | 74% | default | — | |
| TerminalBench Hard | 33% | default | — | |
| τ²-bench | 87% | default | — |
Pricing by serving provider
standard tier · per 1M tokens · click a provider to expandInput pricing runs from $0.09 to $0.10 per 1M tokens across 2 providers, so the dearest route costs 11% more than the cheapest for the same model.
| Serving provider | Input /1M | Output /1M | Endpoints | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| VercelRouted quoteVercel reseller quote | $0.09 | $0.30 | 1 | |||||||||||||
Standardstepfun/step-3.5-flash
| ||||||||||||||||
| OpenRouter | $0.10 | $0.30 | 1 | |||||||||||||
Standardstepfun/step-3.5-flash
| ||||||||||||||||
Price history
OpenRouter routed quoteOpenRouter's price is a routed quote. It moves with whichever upstream route OpenRouter prefers that day, so we do not track it as a price history.
Cost calculator
estimate your monthly spend on this modelModel IDs
copy the exact identifier for your platformFrequently asked questions
Step 3.5 Flash pricing, context and availabilityHow much does Step 3.5 Flash cost?
Step 3.5 Flash costs $0.09 per 1M input tokens as a Vercel reseller quote, and $0.30 per 1M output tokens as an OpenRouter routed quote. A Vercel reseller quote is the price Vercel lists for serving this model, not the maker list price, so it moves when Vercel re-routes. An OpenRouter routed quote is the price of whichever upstream provider OpenRouter prefers today, so it moves day to day. Across 2 serving providers, input prices range from $0.09 to $0.10 per 1M tokens.
What is the context window of Step 3.5 Flash?
Step 3.5 Flash accepts up to 262K tokens of context and can return up to 66K output tokens.
Which providers serve Step 3.5 Flash?
Step 3.5 Flash is available from 2 serving providers, each with its own pricing and model ID. Vercel is currently the cheapest, as a routed quote.
What can Step 3.5 Flash do?
Step 3.5 Flash supports tool use and reasoning.
Other Other models
compare pricing across the Other lineupEvery weekday
AI moves fast. Here's your debrief.
News, analysis, tools, and more.
For people who build with AI