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MODEL DEVELOPER

StepFun

Explore model families, weights and usage terms in the StepFun repositories.

Official documentation
On this page

Explore this developer’s model families

Listed families
1
Versions
34
Field review
0

0 entries use official model documentation and 34 use model-card metadata. Explore specifications, uses, prices and release records by version.

Filter these versions in the directory →View coverage →

About the organization

Official StepFun information and model projects establish the developer relationship. Teams, brands and legal entities are recorded separately, without implying exclusive ownership.

StepFun official model organization account ↗StepFun · Step3 official project documentation ↗

StepFun ↗

Company

StepFun’s official model account identifies its company entity. The Step3 project provides multimodal reasoning models and API links. The company–project relationship is verified, but model names, webpage shells and copyright notices do not establish founding, headquarters or finances.

Founded
Not provided
The founding date is not documented. Project launches, copyright years and model release dates are recorded separately.
Headquarters / public address
Not provided
The current headquarters is not documented. Offices, contact addresses and registered addresses are recorded separately.
Entity & listing status
Listing status not documented
Current listing status and ticker symbols are not documented. Investors and affiliated companies are listed separately.

Research & products

Financial & funding snapshots

No financial disclosure with a clear date is available. Market capitalization, funding and valuations are recorded separately.

No milestones with a documented date yet.

StepFun official model organization account ↗StepFun · Step3 official project documentation ↗
Reviewed 2026-10-17 · References last checked 2026-10-17. Financial snapshots retain their own dates and currencies. Funding, valuations and market capitalization are recorded separately.

Model families

Step →34 versions

Explore Step versions, primary tasks, weights, access terms and references.

Billing & payment details

Check the developer’s official terms for billing plans and payment conditions.API usage and subscription benefits are separate. Listed and settlement currencies may differ; actual payment depends on your account conditions.

Developer model prices

Images are priced per image, video per second and music per track. Compare within the same currency and unit, and check official pricing for usage conditions.

No prices match this mode, tier and currency. Try Standard or check the recorded quotes below. Missing prices remain blank.

All quotes, future prices and conditions (0 records)

    No prices are recorded for this version. Check the official pricing page.

    Versions at a glance

    • Step-3.5-Flash →

      stepfun-ai/Step-3.5-Flash

      Uses / inputs & outputs
      Chat

      Text → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • Step-3.7-Flash →

      stepfun-ai/Step-3.7-Flash

      Uses / inputs & outputs
      Image understanding

      Text / Image → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • Step-3.7-Flash-GGUF →

      stepfun-ai/Step-3.7-Flash-GGUF

      Uses / inputs & outputs
      Image understanding

      Text / Image → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • Step-3.7-Flash-NVFP4 →

      stepfun-ai/Step-3.7-Flash-NVFP4

      Uses / inputs & outputs
      Image understanding

      Text / Image → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • step3 →

      stepfun-ai/step3

      Uses / inputs & outputs
      Image understanding

      Text / Image → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • Step3-VL-10B →

      stepfun-ai/Step3-VL-10B

      Uses / inputs & outputs
      Image understanding

      Text / Image → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • NextStep-1.1 →

      stepfun-ai/NextStep-1.1

      Uses / inputs & outputs
      Image generation

      Text → Image

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Check media specifications

      Current status unknown

    • NextStep-1.1-Pretrain-256px →

      stepfun-ai/NextStep-1.1-Pretrain-256px

      Uses / inputs & outputs
      Image generation

      Text → Image

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Check media specifications

      Current status unknown

    • NextStep-1.1-Pretrain →

      stepfun-ai/NextStep-1.1-Pretrain

      Uses / inputs & outputs
      Image generation

      Text → Image

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Check media specifications

      Current status unknown

    • NextStep-1-Large →

      stepfun-ai/NextStep-1-Large

      Uses / inputs & outputs
      Image generation

      Text → Image

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Check media specifications

      Current status unknown

    • NextStep-1-Large-Edit →

      stepfun-ai/NextStep-1-Large-Edit

      Uses / inputs & outputs
      Image editing

      Image → Image

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Check media specifications

      Current status unknown

    • NextStep-1-Large-Pretrain →

      stepfun-ai/NextStep-1-Large-Pretrain

      Uses / inputs & outputs
      Image generation

      Text → Image

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Check media specifications

      Current status unknown

    • Step-3.5-Flash-Base →

      stepfun-ai/Step-3.5-Flash-Base

      Uses / inputs & outputs
      Text completion

      Text → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • Step-3.5-Flash-Base-Midtrain →

      stepfun-ai/Step-3.5-Flash-Base-Midtrain

      Uses / inputs & outputs
      Chat

      Text → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • Step-3.5-Flash-FP8 →

      stepfun-ai/Step-3.5-Flash-FP8

      Uses / inputs & outputs
      Chat

      Text → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • Step-3.5-Flash-GGUF-Q4_K_S →

      stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S

      Uses / inputs & outputs
      Chat

      Text → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • Step-3.7-Flash-FP8 →

      stepfun-ai/Step-3.7-Flash-FP8

      Uses / inputs & outputs
      Image understanding

      Text / Image → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • Step-Audio-Chat →

      stepfun-ai/Step-Audio-Chat

      Uses / inputs & outputs
      Audio understanding

      Text / Audio → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • Step-Audio-R1.1 →

      stepfun-ai/Step-Audio-R1.1

      Uses / inputs & outputs
      Audio understanding

      Text / Audio → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • Step-Audio-R1 →

      stepfun-ai/Step-Audio-R1

      Uses / inputs & outputs
      Audio understanding

      Text / Audio → Text

      Access and licensing
      权重需申请

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • Step-Audio-TTS-3B →

      stepfun-ai/Step-Audio-TTS-3B

      Uses / inputs & outputs
      Speech generation

      Text → Audio

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Check media specifications

      Current status unknown

    • Step1X-Edit →

      stepfun-ai/Step1X-Edit

      Uses / inputs & outputs
      Image editing

      Image → Image

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Check media specifications

      Current status unknown

    • Step1X-Edit-v1p1-diffusers →

      stepfun-ai/Step1X-Edit-v1p1-diffusers

      Uses / inputs & outputs
      Image editing

      Image → Image

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Check media specifications

      Current status unknown

    • Step1X-Edit-v1p2 →

      stepfun-ai/Step1X-Edit-v1p2

      Uses / inputs & outputs
      Image editing

      Image → Image

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Check media specifications

      Current status unknown

    • Step1X-Edit-v1p2-preview →

      stepfun-ai/Step1X-Edit-v1p2-preview

      Uses / inputs & outputs
      Image editing

      Image → Image

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Check media specifications

      Current status unknown

    • step3-fp8 →

      stepfun-ai/step3-fp8

      Uses / inputs & outputs
      Image understanding

      Text / Image → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • Step3-VL-10B-Base →

      stepfun-ai/Step3-VL-10B-Base

      Uses / inputs & outputs
      Image understanding

      Text / Image → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • Step3-VL-10B-FP8 →

      stepfun-ai/Step3-VL-10B-FP8

      Uses / inputs & outputs
      Image understanding

      Text / Image → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • StepFun-Formalizer-32B →

      stepfun-ai/StepFun-Formalizer-32B

      Uses / inputs & outputs
      Chat

      Text → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • StepFun-Formalizer-7B →

      stepfun-ai/StepFun-Formalizer-7B

      Uses / inputs & outputs
      Chat

      Text → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • StepFun-Prover-Preview-32B →

      stepfun-ai/StepFun-Prover-Preview-32B

      Uses / inputs & outputs
      Chat

      Text → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • StepFun-Prover-Preview-7B →

      stepfun-ai/StepFun-Prover-Preview-7B

      Uses / inputs & outputs
      Chat

      Text → Text

      Access and licensing
      Open weights

      Open weights · apache-2.0 · Commercial weight use unknown

      Limits & data status
      Context window: No single value specified

      Current status unknown

    • stepvideo-t2v →

      stepfun-ai/stepvideo-t2v

      Uses / inputs & outputs
      Video generation

      Text → Video

      Access and licensing
      Open weights

      Open weights · mit · Commercial weight use unknown

      Limits & data status
      Check media specifications

      Current status unknown

    • stepvideo-ti2v →

      stepfun-ai/stepvideo-ti2v

      Uses / inputs & outputs
      Video generation

      Image → Video

      Access and licensing
      Open weights

      Open weights · mit · Commercial weight use unknown

      Limits & data status
      Check media specifications

      Current status unknown

    Release & lifecycle history

    No documented releases for this family yet. Model release dates, repository changes and listing dates are recorded separately.

    References & scope

    Each version also lists its own specification and license references. Developer regions follow public organization records. They do not establish API availability, operating regions or a user’s location. Catalog as of 2026-10-31.

    Find APIs, tools & benchmarks

    Find APIs by model family, then check each service for the exact model, region and supported interfaces. Tools and reports link to specific versions.