Step-3.5-Flash
MultimodalStep 3.5 Flash is a fast and efficient language model by StepFun, optimized for low-latency inference while maintaining strong performance in reasoning, coding, and general knowledge tasks. It offers an excellent balance between speed and quality for production deployments.
Key Specifications
Parameters
196.0B
Context
65.5K
Release Date
February 1, 2026
Average Score
78.6%
Timeline
Key dates in the model's history
Announcement
February 1, 2026
Last Update
February 12, 2026
Today
October 5, 2026
Technical Specifications
Parameters
196.0B
Training Tokens
-
Knowledge Cutoff
-
Family
-
Capabilities
MultimodalZeroEval
Pricing & Availability
Input (per 1M tokens)
$0.10
Output (per 1M tokens)
$0.40
Max Input Tokens
65.5K
Max Output Tokens
8.2K
Supported Features
Function CallingStructured OutputCode ExecutionWeb SearchBatch InferenceFine-tuning
Benchmark Results
Model performance metrics across various tests and benchmarks
Programming
Programming skills tests
SWE-Bench Verified
• Self-reported
Other Tests
Specialized benchmarks
AIME 2025
• Self-reported
Tau-bench
• Self-reported
LiveCodeBench v6
• Self-reported
IMO-AnswerBench
• Self-reported
BrowseComp
Context Manager • Self-reported
Terminal-Bench 2.0
• Self-reported
License & Metadata
License
apache-2.0
Announcement Date
February 1, 2026
Last Updated
February 12, 2026
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