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Step 3.5 Flash

StepFunCurrentReleased Jan 20, 2026
Overall Score
Coming soon
Arena Elo
1392
Categories Ranked
0of 8
Price (1M tokens)
$0.1 in / $0.3 out
Speed
87tok/s
Context
256K
Open WeightSelf-hostNon-Reasoning
Confidence
base

BenchLM is tracking Step 3.5 Flash, but sourced benchmark results are not published on the site yet. This page currently shows the model metadata we can verify now, and score-level benchmark coverage will appear once public evaluations land.

Step 3.5 Flash is a open weight model with a 256K token context window. It processes queries without explicit chain-of-thought reasoning, offering faster response times and lower token usage.

This profile currently has 0 sourced benchmarks on BenchLM, so the benchmark sections below are intentionally marked as coming soon.

Ranking Distribution

Category rank across 8 benchmark categories — sorted by best rank

Category Performance

Scores across all benchmark categories (0-100 scale)

Category Breakdown

Agentic

58.0/ 100
Weight: 22%0 benchmarks
Terminal-Bench 2.0BrowseCompOSWorld-VerifiedGAIATAU-benchWebArena

Coding

62.3/ 100
Weight: 20%0 benchmarks
SWE-bench VerifiedLiveCodeBenchSWE-bench ProSWE-RebenchSciCode

Reasoning

75.8/ 100
Weight: 17%0 benchmarks
MuSRLongBench v2MRCRv2ARC-AGI-2

Knowledge

62.6/ 100
Weight: 12%0 benchmarks
GPQASuperGPQAMMLU-ProHLEFrontierScienceSimpleQA

Math

89.3/ 100
Weight: 5%0 benchmarks
AIME 2025BRUMO 2025MATH-500FrontierMath

Multilingual

82.8/ 100
Weight: 7%0 benchmarks
MGSMMMLU-ProX

Multimodal

66.4/ 100
Weight: 12%0 benchmarks
MMMU-ProOfficeQA ProCharXivCharXiv w/o tools

Inst. Following

81.7/ 100
Weight: 5%0 benchmarks
IFEvalIFBench

Chatbot Arena Performance

Text Overall1392CI: ±4.621,987 votes
Coding1449CI: ±8.54,924 votes
Math1401CI: ±15.01,457 votes
Instruction Following1381CI: ±7.76,044 votes
Creative Writing1341CI: ±10.63,300 votes
Multi-turn1397CI: ±9.63,925 votes
Hard Prompts1411CI: ±5.812,236 votes
Hard Prompts (English)1423CI: ±8.05,507 votes
Longer Query1408CI: ±7.76,050 votes

Benchmark Details

Only benchmark rows with an attached exact-source record are shown here. Source-unverified manual rows and generated rows are hidden from model pages.

Frequently Asked Questions

How does Step 3.5 Flash perform overall in AI benchmarks?

BenchLM is tracking Step 3.5 Flash, but sourced benchmark coverage is still coming soon. We currently list its creator, model type, and context window while we wait for public benchmark results.

Is Step 3.5 Flash open source?

Yes, Step 3.5 Flash is an open weight model created by StepFun, meaning it can be downloaded and run locally or fine-tuned for specific use cases.

Does Step 3.5 Flash have full benchmark coverage on BenchLM?

Not yet. Step 3.5 Flash currently has 0 published benchmark scores out of the 178 benchmarks BenchLM tracks. BenchLM only exposes non-generated public benchmark rows, so missing categories stay blank until a sourced evaluation is available.

What is the context window size of Step 3.5 Flash?

Step 3.5 Flash has a context window of 256K, which determines how much text it can process in a single interaction.

Last updated: April 24, 2026 · Runtime metrics stay blank until BenchLM has a sourced snapshot.

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