Step 3.5 Flash

Fast economical route for broad low-latency text workloads

Public model detailAvailableDense Transformer

Params

3.5 Flash

Context

128K

Max Output

16K

License

StepFun

TTFT

160ms

Throughput

120 tok/s

Why pick it

Standard $0.14/M with $0.10/M batch
Good for commodity request handling

Pricing

TierPublicCachedPrice sourceNote

Realtime$0.10 / $0.10N/ASiliconFlow lanePublic price reflects the runtime catalog without claimed savings comparisons

Batch$0.07 / $0.07N/ASiliconFlow laneBatch public pricing follows the same runtime source

Quick start

OpenAI-compatible surface. Swap the base URL and ship

Try in Playground Open pricing

Python

from openai import OpenAI

client = OpenAI(
    base_url="https://api.luminapath.tech/v1",
    api_key="BATCHIN_API_KEY"
)

resp = client.chat.completions.create(
    model="step-3-5-flash",
    messages=[{"role": "user", "content": "Summarize why this model is a fit for my workload"}]
)

print(resp.choices[0].message.content)

JavaScript

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.luminapath.tech/v1",
  apiKey: process.env.BATCHIN_API_KEY,
});

const resp = await client.chat.completions.create({
  model: "step-3-5-flash",
  messages: [{ role: "user", content: "Summarize why this model is a fit for my workload" }],
});

console.log(resp.choices[0]?.message?.content);

cURL

curl https://api.luminapath.tech/v1/chat/completions \
  -H "Authorization: Bearer ***" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "step-3-5-flash",
    "messages": [{"role":"user","content":"Summarize why this model is a fit for my workload"}]
  }'

Specs

Architecture

Dense Transformer

Vendor group

StepFun

Context window

128K

Max output

16K

Best for

flash

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