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Step 3.5 Flash

StepFun · released 6 months ago

Step 3.5 Flash is a StepFun model with a 262K token context window — about 370 pages of text. It reads Text and replies in Text. It can show its reasoning before it answers.

$0.115

input / 1M tokens

$0.345

output / 1M tokens

262K

context — about 370 pages

0.09¢

a client proposal

Pricing

Input
$0.115 per million tokens
Output
$0.345 per million tokens

Billed from your Alyph wallet. Prices can change when the provider changes theirs — last checked August 9, 2026.

The numbers

Provider
StepFun
Released
6 months ago (2026-01-29)
Context window
262K tokens — about 370 pages
Max output
66K tokens per reply
Input
Text
Output
Text
Reasoning
Shows its thinking before answering

Cost vs Token Amount

Drag the slider to adjust the split between input and output workload.

80% Input20% Output
free$0.08$0.160 tokens250k500k750k1000k
Step 3.5 Flash

Adjust the ratio slider to change how output tokens influence the final price for equivalent workloads.

What a task costs

2K tokens in · 500 tokens out.

Step 3.5 Flash

StepFun

0.04¢

for this task

57% input · 43% output

Full pricing →

Your $5 welcome credit covers about 12,422 of these.

Compare Step 3.5 Flash

Closest in price on a typical task:

Step 3.5 Flash vs Llama 4 Scout →Step 3.5 Flash vs Voxtral Small 24B 2507 →Step 3.5 Flash vs Nemotron 3 Super →Step 3.5 Flash vs Llama 3.3 70B Instruct →Any other combination →

Questions, answered

How much does Step 3.5 Flash cost on Alyph?

Step 3.5 Flash costs $0.115 per million input tokens and $0.345 per million output tokens on Alyph. A typical task — 5K tokens in, 800 out — works out to about 0.09¢. Billed from your Alyph wallet, with hard spending limits. Prices can change when the provider changes theirs; this page was last checked on August 9, 2026.

What is Step 3.5 Flash's context window?

262K tokens — about 370 pages. Replies can be up to 66K tokens long.

Can Step 3.5 Flash read images and files?

Step 3.5 Flash is text-only. The canvas still serializes uploads into plain text, so you can work with files — but it cannot see images.

Does Step 3.5 Flash show its reasoning?

Yes. Step 3.5 Flash can expose its thinking before the final answer, so you can watch how it got there.

Test Step 3.5 Flash against Llama 4 Scout

One prompt, both models at the same time, the better answer wins. Free to start, with $5 of credit.

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