Step 3.5 Flash

Open weights Active Text LLM MoE step-3-5-flash

196B MoE reasoning model (11B active) with 256K context, built for agents and coding.

Released
Feb 2, 2026
Context window
262K tokens
Max output
Not disclosed
Parameters
196B 11B active
Input price
$0.10 per 1M
Output price
$0.30 per 1M

Prices are first-party list prices in USD at the standard tier. Last verified Oct 30, 2026.

Pricing

Launch priceFeb 2, 2026
$0.10 in / $0.30 out
Current price since Feb 2, 2026
$0.10 in / $0.30 out
Cached input $0.02 per 1M

Specifications

Developer
StepFun
Model type
Text LLM
Architecture
MoE
Parameters
196B (11B active)
Input
Text
Output
Text
Knowledge cutoff
Not disclosed
License
Apache License 2.0
API access
First-party API
Capabilities
Agentic Coding Reasoning Tool use