Step 3.5 Flash — StepFun | AI Model Details | Neura | Neura Market
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    StepFun

    Step 3.5 Flash

    by StepFuntext->text1 endpoint
    Neura Intelligence Index
    73.0/ 100
    Rank
    #55—
    Confidence
    low
    Benchmarks
    3(8% coverage)

    Overview

    Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....

    Capabilities

    Text generation
    Tool use / Function calling
    Extended reasoning
    Long context
    Top-P sampling

    Modalities

    Input
    Text
    Output
    Text

    Technical Specifications

    Context Window
    262.1K tokens
    Max Output
    65.5K tokens
    Tokenizer
    Other
    Uptime (24h)
    10000.0%
    Parameters
    196000000000B
    License
    apache_2_0Open Weights

    Supported Parameters

    frequency_penaltyinclude_reasoningmax_tokensreasoningtemperaturetool_choicetoolstop_ktop_p

    Benchmark Performance

    coding

    BenchmarkScoreSource
    SWE-bench Verified
    74.4
    		verified

    math

    BenchmarkScoreSource
    AIME 2025
    97.3
    		verified

    agent

    BenchmarkScoreSource

    Performance Over Time

    Pricing

    Per 1M tokens
    Input$0.10
    Output$0.30
    StepFun WebsiteHugging Face

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    $0.20/M in256K ctx

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    Country
    🇨🇳CN
    Release Date
    February 2, 20265mo
    BrowseComp
    69
    		verified
    Added
    January 29, 2026
    Last synced 7/21/2026