Step 3.5 Flash

StepFun

Cost/1M tokens

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

Benchmarks

DeepSWE is the primary coding benchmark where an exact model evaluation exists. Arena leaderboards and other sourced evaluations appear below; missing scores are not zero.

How it ranks

Against its predecessor, similarly priced models and the models ranked around it.

DeepSWE 1.1

Best pass@1 per model · Higher is better

Not evaluated in DeepSWE 1.1

Arena Text

Best Arena rating per model · Higher is better

Arena #176

  1. 1395
  2. 1394
    Qwen3.5-35B-A3BNearby rank
  3. 1393
    Step 3.5 Flash
  4. 1392
    MiMo-V2-FlashNearby rank
  5. 1391
    MiniMax M2.5Nearby rank
  6. 1382
  7. 1365
    Gemma 3 27BSimilar price
  8. 1364
    GLM 4.7 FlashSimilar price
  9. 1322
    Llama 4 ScoutSimilar price

Ahead of 4 of 4 similarly priced models

Arena WebDev

Best Arena rating per model · Higher is better

Not ranked on Arena WebDev yet

Arena Search

Best Arena rating per model · Higher is better

Not ranked on Arena Search yet

Agent Arena

Best IPS score per model · Higher is better

Not ranked on Agent Arena yet

Not evaluated in DeepSWE 1.1 as of 2026-09-22. Results are only shown for exact model versions in the official dataset. Official leaderboard.

All published scores

Arena ratings: Arena (lmarena-ai/leaderboard-dataset), licensed CC BY 4.0. Ratings come from pairwise human votes and are only comparable within one leaderboard; the interval is Arena's 95% confidence interval. Model names are matched to the Vertical Tabs catalog.

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