Models/StepFun/Step 3.7 Flash

Step 3.7 Flash

#17 on OpenRouter This Week at 857B (−30% week-over-week, not share). Official Apache-2.0 repo. AA Intelligence Index 31. Same page prints $0.20 / $1.15, 111.5 tok/s, and $319.97 to run the Index. No official DeepSWE or vals card.

01

Identity

262,144Context in
256,000Context out
2026-05-28 (OpenRouter created 1779985069)Released
OpenWeights
Canonical name
Step 3.7 Flash
Aliases
step-3.7-flash, stepfun/step-3.7-flash
Continuum hosted id
Not listed as a Continuum hosted id
OpenRouter slug
stepfun/step-3.7-flash
Hugging Face
stepfun-ai/Step-3.7-Flash
Modalities
text, image, video
Open weights Not on Continuum host list Vendor lab

Not listed as a Continuum hosted id. Apache-2.0 on the official repo. OpenRouter catalog created unix 1779985069 (28 May 2026). 262,144 in / 256,000 out; text + image + video in, text out. Hugging Face id stepfun-ai/Step-3.7-Flash.

HF config.json (fetched 19 Aug 2026): Step3p7ForConditionalGeneration. Text stack Step3p5ForCausalLM, 45 layers, hidden 4096, 262,144 positions. Vision config present.

02

Should I use this for coding agents

Use Step 3.7 Flash when you want this official open checkpoint. AA Intelligence Index 31. We do not invent a DeepSWE percent.

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
31
bench
Artificial Analysis
version
Intelligence Index
harness
published integer
metric
Intelligence Index
value
31
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

vals 404 as of 19 Aug 2026. Chip omitted.

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 list pair $0.20 / $1.15 per 1M Printed AA pricing sentence. Matches the OpenRouter catalog pair. Artificial Analysis Step 3.7 Flash source 2026-08-19
AA throughput 111.5 tok/s Printed Speed row. Not a coding score. Artificial Analysis Step 3.7 Flash source 2026-08-19
AA Index eval cost $319.97 Printed “it cost $319.97 to evaluate Step 3.7 Flash on the Intelligence Index.” Artificial Analysis Step 3.7 Flash source 2026-08-19
03

When not to use it

Trust this before you buy

  • No official DeepSWE or vals row (vals 404). Week tokens fell 30% WoW. Volume is not a quality signal, and a falling week is not a quality signal either.
  • Apache-2.0 open weights. No official GGUF on this repo. Community quants are community.
  • Not a Continuum hosted id. 262k context is smaller than the 1M peers.

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: 201,365,316,160 stored tensors
Architecture
Step3p7ForConditionalGeneration · text Step3p5ForCausalLM · 45 layers · hidden 4096 · 262,144 positions · vision present
Native precision
HF tensors BF16 + F32
Files
26 safetensor files (model-00001 … model-00024 plus model-vit-00001 and model-vit-00002)
Repo size
HF API usedStorage 402,731,781,945 bytes (375 GiB)
HF created
2026-05-23T02:13:46Z
Chat template
Jinja present on the Hub card.
Paper
No arXiv tag on the Hugging Face API payload we fetched.
Official HF repo
stepfun-ai/Step-3.7-Flash
HF downloads
105,874
HF likes
442

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.

Hub file tree

Safetensor shards
26
Shard bytes
402,730,833,632 bytes
Other file bytes
10,711,536 bytes
Tree file count
39
Hub usedStorage
402,731,781,945 bytes

usedStorage and the sum of .safetensors sizes can differ (LFS pointers, non-shard files, duplicate copies). Cited separately. Source: recursive tree API, 2026-08-19.

PathBytes
model-00001.safetensors924,094,096
model-00002.safetensors9,808,156,008
model-00003.safetensors18,557,475,928
model-00004.safetensors18,624,846,944
model-00005.safetensors18,557,475,928
model-00006.safetensors18,624,846,976
model-00007.safetensors18,557,475,968
model-00008.safetensors18,624,846,976
model-00009.safetensors18,557,475,968
model-00010.safetensors18,624,846,976
model-00011.safetensors18,557,475,968
model-00012.safetensors18,624,846,976

Showing the first 12 of 26 safetensor shards. The tree also holds 13 non-shard files, none of them listed here. The snapshot was capped at 12 shards when the tree API was read on 2026-08-19, so the remaining 14 are on the Files tab, not on this page. Totals above are the full tree API sum, not this slice. Byte sizes are Hub tree API size fields, never invented.

05

Continuum serving

Not listed as a Continuum hosted id. OpenRouter stepfun/step-3.7-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: $0.20 / $1.15 per million, cache read $0.04 /M, 262,144 / 256,000, created 1779985069. No DeepSWE $/task.

Artificial Analysis Step 3.7 Flash page (19 Aug 2026) prints the same $0.20 / $1.15 pair, 111.5 tok/s, and “it cost $319.97 to evaluate Step 3.7 Flash on the Intelligence Index.”

Price this model Opens the pricing calculator preloaded with Step 3.7 Flash.

Artificial Analysis Intelligence Index 31, fetched 19 Aug 2026. Same page prints $0.20 / $1.15, 111.5 tok/s, and $319.97 to run the Index. The AA tile is the published integer 31. AA did not print a DeepSWE-style CI or step count we will copy onto the chip.

07

Provenance

ClaimSourceAs of
OR catalog $0.20 / $1.15, cache read $0.04/M, 262,144 / 256,000, created 1779985069, hugging_face_id stepfun-ai/Step-3.7-FlashOpenRouter catalog2026-08-19
857B week tokens (−30% WoW), #17 This WeekOpenRouter rankings This Week2026-08-19
HF safetensors.total 201,365,316,160; usedStorage 402,731,781,945; 26 safetensor files; likes 442; downloads 105,874; created 2026-05-23T02:13:46Z; Apache-2.0Hugging Face API stepfun-ai/Step-3.7-Flash2026-08-19
AA Index 31; $0.20 / $1.15; 111.5 tok/s; $319.97 to evaluate IndexArtificial Analysis Step 3.7 Flash2026-08-19
vals 404vals.ai Step 3.7 Flash2026-08-19
OpenRouter id stepfun/step-3.7-flash, context 262,144OpenRouter /api/v1/models2026-08-19
HF downloads 105,874Hugging Face API stepfun-ai/Step-3.7-Flash2026-08-19
26 safetensor shards; shard bytes 402,730,833,632; tree files 39Hugging Face tree API stepfun-ai/Step-3.7-Flash2026-08-19
Spaces API returned 27; official collection Step-3.7-Flash (4 items, 17 upvotes)Hugging Face Spaces / collections API2026-08-19
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 3.5 Flash.

FAQ

Why no DeepSWE chip?

The official DeepSWE board updated 13 Aug 2026 did not list Step 3.7 Flash. Omitting is the rule.

Does −30% WoW mean quality fell?

No. Week tokens measure routing volume. AA 31 is the quality tile we will name.

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-3.7-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.