Models/StepFun/Step 3.5 Flash

Step 3.5 Flash

Previous StepFun Flash. Official Apache-2.0 repo. AA 27. OpenRouter $0.10 / $0.30: same catalog pair as Step 3.7 Flash, different AA (27 vs 31 on that card). No DeepSWE or vals row.

01

Identity

262,144Context in
65,536Context out
2026-01-29 (OpenRouter created 1769728337)Released
OpenWeights
Canonical name
Step 3.5 Flash
Aliases
step-3.5-flash, stepfun/step-3.5-flash
Continuum hosted id
Not listed as a Continuum hosted id
OpenRouter slug
stepfun/step-3.5-flash
Hugging Face
stepfun-ai/Step-3.5-Flash
Modalities
text
Open weights Not on Continuum host list Vendor lab

Open Apache-2.0 at stepfun-ai/Step-3.5-Flash. Catalog $0.10 / $0.30, 262,144 / 65,536, created unix 1769728337 (29 Jan 2026).

Step 3.7 Flash is the ranking-week StepFun card. Same OR pair is not the same model.

02

Should I use this for coding agents

Use 3.5 Flash when you want this official previous checkpoint. AA Intelligence Index 27. We do not invent a DeepSWE percent. Hub API 19 Aug 2026: 834 likes, 162,746 downloads.

DeepSWE

No official DeepSWE mini-swe-agent row for this identity on the public board we fetched.

omitted, not invented as of 2026-08-13 source
Artificial Analysispublished integer
27
bench
Artificial Analysis
version
Intelligence Index
harness
published integer
metric
Intelligence Index
value
27
independent as of 2026-08-19 source
Vals Index

We did not open a vals.ai card for this identity. Chip omitted.

omitted, not invented as of 2026-08-19 source

Ranked view: Best coding models: the independent leaderboard puts this row and every other card that carries an independent coding score on one board, with the confidence intervals left visible.

Named benches, printed only

Copied from AA or vals HTML we opened. 0.0% placeholder bars are omitted. Do not average these into the hero tiles, and do not invent CI, $/task, or steps for Artificial Analysis.

BenchPrintedNoteSourceURLAs of
AA throughput 213 tok/s Printed Speed row. Artificial Analysis Step 3.5 Flash source 2026-08-19
03

When not to use it

Trust this before you buy

  • Need Step 3.7 Flash (AA 31 on that card). Need DeepSWE or vals Accuracy. Neither board printed 3.5 Flash.
  • Same OR $0.10 / $0.30 as 3.7 does not make them one SKU.

Plus is $25/mo with $25 weekly hosted usage. The Mac app stays free with your own keys. Get Plus is not Download for Mac.

04

Artifact and Hugging Face downloads

Artifact

SPDX / license
Apache-2.0
Total params
HF safetensors.total: 199,384,301,376 stored tensors
Repo size
HF API usedStorage 398,769,942,782 bytes
HF created
2026-02-01T08:03:45Z
Official HF repo
stepfun-ai/Step-3.5-Flash
HF downloads
162,746
HF likes
834

Community quants: Community quants are community.

Official weights

This is the model repo, not Download for Mac. Downloads and likes from the Hugging Face API on 2026-08-19.

05

Continuum serving

Not listed as a Continuum hosted id. OpenRouter stepfun/step-3.5-flash.

Continuum hosted id not on the host list

We list first-party and OpenRouter, plus Continuum only when the live public allowlist named the id. This is not a 15-host routing table.

06

Economics

OpenRouter catalog 19 Aug 2026: $0.10 / $0.30. AA 27 page: 213 tok/s. Same OR pair as 3.7 Flash ($0.20 / $1.15 on that card’s catalog row. Do not collapse the two cards’ invoices; this SKU’s catalog row is $0.10 / $0.30).

Price this model Opens the pricing calculator preloaded with Step 3.5 Flash.

Artificial Analysis Intelligence Index 27, fetched 19 Aug 2026. Same page: 213 tok/s. The 3.7 Flash card chips AA 31.

07

Provenance

ClaimSourceAs of
OR catalog $0.10 / $0.30, 262,144 / 65,536, created 1769728337, HF stepfun-ai/Step-3.5-FlashOpenRouter catalog2026-08-19
AA Index 27; 213 tok/sArtificial Analysis Step 3.5 Flash2026-08-19
HF likes 834; downloads 162,746; usedStorage 398,769,942,782; safetensors.total 199,384,301,376; Apache-2.0; created 2026-02-01T08:03:45ZHugging Face API2026-08-19
OpenRouter id stepfun/step-3.5-flash, context 262,144OpenRouter /api/v1/models2026-08-19
HF downloads 162,746Hugging Face API stepfun-ai/Step-3.5-Flash2026-08-19
08

Compare, FAQ, and Get Plus

No other card in this cluster shares a published DeepSWE official row we can put next to this one. We will not compare on vendor-blog numbers.

Continue through StepFun's model family with Step 3.7 Flash.

FAQ

Same price as 3.7 Flash?

This SKU’s 19 Aug catalog row is $0.10 / $0.30. The 3.7 Flash card cites $0.20 / $1.15 on its catalog row. Different invoices. AA 27 here, 31 on 3.7.

Why does the lab blog disagree with DeepSWE or Scale?

Lab posts pick a harness, an effort, a split, and sometimes a private eval set. DeepSWE publishes the official mini-swe-agent row with cost, tokens, and steps. Scale SWE-bench Pro only counts when the public shared-harness board has a row we can fetch. A higher lab number is usually a different test, not a better one.

OpenAI-compatible call

No Continuum hosted id is verified for this model, so this page does not invent a curl target. Use the first-party API or the OpenRouter slug stepfun/step-3.5-flash.

Plus is $25/mo with $25 weekly hosted usage. The Mac app stays free with your own keys. Get Plus is not Download for Mac.