Step 3.5 Flash

Step 3.5 Flash

Developer	StepFun
Release date	January 29, 2026
Family	Step
Generation	Step 3.5
Level
Context window	262K tokens
Max output	66K tokens
Input	Text
Output	Text
Knowledge cutoff	2025-01
Weights	Open weights
Successor	Step 3.7 Flash
Website	stepfun.com
Links	Model card Docs Hugging Face

Part of a series on

input: $0.10
output: $0.30
Context: 262Ktokens
Released: 9mo ago
Size: 199Bparameters

Specifications

Model

Developer: StepFun
Family: Step Step 3.5
Type: Language model
Released: January 29, 2026
Model ID: stepfun/step-3.5-flash

Capabilities

Input → output: Text → Text
Max output: 66K tokens
Tokenizer: Other
Knowledge cutoff: 2025-01

Weights

Openness: Open weights
Size: 199B
Hugging Face: stepfun-ai/Step-3.5-Flash

Sources:models.devOpenRouter

Metadata synced Nov 11, 2026, 8:01 AM UTC

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