LLMOpen weights

Step 3.5 Flash

StepFun

Updated May 21, 2026 · Benchmarks via Artificial Analysis, specs & pricing via OpenRouter · Methodology · Report an error

Specifications

Type: LLM
Access: Open weights
Released: January 29, 2026
Context window: 262,144 tokens
Output speed: 194 tok/s
Latency (TTFT): 0.85s
Input: Text
Output: Text
API pricing: $0.09 in · $0.30 out / 1M tokens

Capabilities

Function callingStructured output

Benchmarks

Reasoning

83.1

General

Humanity’s Last Exam

19.1

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