per 1M tokens
StepFun: Step 3.5 Flash
stepfun/step-3.5-flash
Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....
Price
per 1M tokens
Providers
Each row is one seller. Prices are the published rate from that source. A dash means that source did not publish the amount. Sorted by a 3:1 blend of input and output.
| Provider | Tag | Quant | Input | Output | Context | Uptime | Status | Source |
|---|---|---|---|---|---|---|---|---|
| SiliconFlow | siliconflow/fp8 | fp8 | $0.1/1M | $0.3/1M | 262K | 100% | Live | openrouter-endpoints |
Monthly bill
Token models use the token counts. Image, video, and audio models use units times the flat rate.
$0.40 at list price for this workload
Every rate
| Unit | Input | Output | Flat | Confidence |
|---|---|---|---|---|
| token | $0.1/1M | $0.3/1M | Not published— | official |
Price history
input or flat output
Daily snapshots
| UTC date | Unit | Input | Output | Flat |
|---|---|---|---|---|
| 2026-09-15 | token | $0.1 | $0.3 | Not published— |
| 2026-09-16 | token | $0.1 | $0.3 | Not published— |
| 2026-09-17 | token | $0.1 | $0.3 | Not published— |
| 2026-09-18 | token | $0.1 | $0.3 | Not published— |
| 2026-09-19 | token | $0.1 | $0.3 | Not published— |
| 2026-09-20 | token | $0.1 | $0.3 | Not published— |
| 2026-09-21 | token | $0.1 | $0.3 | Not published— |
| 2026-09-22 | token | $0.1 | $0.3 | Not published— |
| 2026-09-23 | token | $0.1 | $0.3 | Not published— |
| 2026-09-24 | token | $0.1 | $0.3 | Not published— |
| 2026-09-25 | token | $0.1 | $0.3 | Not published— |
| 2026-09-26 | token | $0.1 | $0.3 | Not published— |
| 2026-09-27 | token | $0.1 | $0.3 | Not published— |
| 2026-09-28 | token | $0.1 | $0.3 | Not published— |
| 2026-09-29 | token | $0.1 | $0.3 | Not published— |
| 2026-09-30 | token | $0.1 | $0.3 | Not published— |
| 2026-10-01 | token | $0.1 | $0.3 | Not published— |
| 2026-10-02 | token | $0.1 | $0.3 | Not published— |
| 2026-10-03 | token | $0.1 | $0.3 | Not published— |
| 2026-10-04 | token | $0.1 | $0.3 | Not published— |
| 2026-10-05 | token | $0.1 | $0.3 | Not published— |
| 2026-10-06 | token | $0.1 | $0.3 | Not published— |
| 2026-10-07 | token | $0.1 | $0.3 | Not published— |
| 2026-10-08 | token | $0.1 | $0.3 | Not published— |
| 2026-10-09 | token | $0.1 | $0.3 | Not published— |
| 2026-10-10 | token | $0.1 | $0.3 | Not published— |
| 2026-10-11 | token | $0.1 | $0.3 | Not published— |
| 2026-10-12 | token | $0.1 | $0.3 | Not published— |
| 2026-10-13 | token | $0.1 | $0.3 | Not published— |
| 2026-10-14 | token | $0.1 | $0.3 | Not published— |
| 2026-10-15 | token | $0.1 | $0.3 | Not published— |
| 2026-10-16 | token | $0.1 | $0.3 | Not published— |
| 2026-10-17 | token | $0.1 | $0.3 | Not published— |
| 2026-10-18 | token | $0.1 | $0.3 | Not published— |
| 2026-10-19 | token | $0.1 | $0.3 | Not published— |
| 2026-10-20 | token | $0.1 | $0.3 | Not published— |
| 2026-10-21 | token | $0.1 | $0.3 | Not published— |
| 2026-10-22 | token | $0.1 | $0.3 | Not published— |
| 2026-10-23 | token | $0.1 | $0.3 | Not published— |
| 2026-10-24 | token | $0.1 | $0.3 | Not published— |
| 2026-10-25 | token | $0.1 | $0.3 | Not published— |
| 2026-10-26 | token | $0.1 | $0.3 | Not published— |
| 2026-10-27 | token | $0.1 | $0.3 | Not published— |
| 2026-10-28 | token | $0.1 | $0.3 | Not published— |
| 2026-10-29 | token | $0.1 | $0.3 | Not published— |
| 2026-10-30 | token | $0.1 | $0.3 | Not published— |
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Parameters (9)
frequency_penaltyinclude_reasoningmax_tokensreasoningtemperaturetool_choicetoolstop_ktop_p
Call this model
OpenRouter id stepfun/step-3.5-flash. InferenceList does not send the request.
curl
curl https://openrouter.ai/api/v1/chat/completions \
-H "Authorization: Bearer $OPENROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"stepfun/step-3.5-flash","messages":[{"role":"user","content":"Hello"}]}'
JavaScript
await fetch("https://openrouter.ai/api/v1/chat/completions", {
method: "POST",
headers: {
Authorization: "Bearer " + process.env.OPENROUTER_API_KEY,
"Content-Type": "application/json",
},
body: JSON.stringify({
model: "stepfun/step-3.5-flash",
messages: [{ role: "user", content: "Hello" }],
}),
});
Python
import os, json, urllib.request
req = urllib.request.Request(
"https://openrouter.ai/api/v1/chat/completions",
data=json.dumps({"model": "stepfun/step-3.5-flash", "messages": [{"role": "user", "content": "Hello"}]}).encode(),
headers={"Authorization": "Bearer " + os.environ["OPENROUTER_API_KEY"], "Content-Type": "application/json"},
)
print(urllib.request.urlopen(req).read().decode())