Compare two models
Select any two models. Input, output, cached, and context rarely move together — the cheaper model on one line isn't always the cheaper one on the next.
Description
Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...
OpenAI's frontier model for complex professional workloads. 1M token context, text + image input, native computer use.
I/O price /1M
$1.00/$2.70
$5.00/$30.00
Input /1M
$1.00
$5.00
Output /1M
$2.70
$30.00
Cached in /1M
$0.05
$0.5
Context
1M
1M
Δ input since launch
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—
Δ output since launch
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Released
Oct 2026
Apr 2026
Status
—
—
Provider
S
StepFun
OpenAI