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Step 3.5 Flash

Coming soon
StepFun

StepFun's cheapest fast model.

FastLow cost
Context window—
Input$0.15210 IQDper 1M tokens
Output$0.45630 IQDper 1M tokens
Input modalitiesText→ Text
Providers1

Overview

Model IDstepfun/step-3.5-flash
SeriesStepFun
Context window—
Max output—
Input modalitiesText
Output modalitiesText
Providers1

Price on OPTES

Our price, per provider, in US dollars and Iraqi dinars (1 USD = 1,380 IQD, rounded up to 10 IQD).

ProviderInputOutputNote
StepFun$0.15 · 210 IQD$0.45 · 630 IQD

Providers

Our price, per provider, in US dollars and Iraqi dinars (1 USD = 1,380 IQD, rounded up to 10 IQD).

ProviderInputOutputNote
StepFun$0.15 · 210 IQD$0.45 · 630 IQD

Call it through the OPTES API

This model is coming soon to OPTES. This is how the call will look; your OPTES key will work for it.

curl https://api.optes3.com/v1/chat/completions \  -H "Authorization: Bearer $OPTES_API_KEY" \  -H "Content-Type: application/json" \  -d '{    "model": "stepfun/step-3.5-flash",    "messages": [{"role": "user", "content": "Suggest three names for a café in Baghdad."}]  }'

Full API reference

Coming soon to OPTES Coming soon

Get your OPTES API key now. The same key will call this model when it opens.

More from StepFun

The OPTES API, sign-up and keys open at launch on Friday, 2 October 2026. Third-party models are coming soon after that.