StepFun

Step 3.6

stepfun/step-3.6

Step 3.6 is StepFun's most capable open-source foundation model. It accepts text inputs and produces text outputs.

StepAudio 3 Chat

stepfun/stepaudio-3-chat

Preview audio and text conversation model with reasoning, function calling and JSON output.

Step 5 Preview

stepfun/step-5-preview

Step 5 Preview is StepFun's flagship multimodal reasoning model for software engineering, agentic tasks and professional knowledge work. Its sparse MoE architecture has 600 billion total parameters and 27 billion active parameters per token, with a 1 million-token context window and text, image and video input.

Step 3.7 Flash

stepfun/step-3.7-flash

Step 3.7 Flash is StepFun's flagship multimodal reasoning model for real-world agent, coding, and workflow tasks. It supports text, image, and video inputs with low-latency tool use.

StepAudio 2.5 Chat

stepfun/stepaudio-2.5-chat

Audio and text conversation model with text output and paralinguistic understanding.

Step 1 32K

stepfun/step-1-32k

Step 1 32K is a first-party StepFun API model.

Step 1 8K

stepfun/step-1-8k

Step 1 8K is a first-party StepFun API model.

Step 1o Audio

stepfun/step-1o-audio

Step 1o Audio is a first-party StepFun API model.

Step 1o Turbo Vision

stepfun/step-1o-turbo-vision

Step 1o Turbo Vision is a first-party StepFun API model.

Step 1o Vision 32K

stepfun/step-1o-vision-32k

Step 1o Vision 32K is a first-party StepFun API model.

Step 1V 32K

stepfun/step-1v-32k

Step 1V 32K is a first-party StepFun API model.

Step 1V 8K

stepfun/step-1v-8k

Step 1V 8K is a first-party StepFun API model.

Step 1X Edit

stepfun/step-1x-edit

Step 1X Edit is a first-party StepFun API model.

Step 1X Medium

stepfun/step-1x-medium

Step 1X Medium is a first-party StepFun API model.

Step 2 16K

stepfun/step-2-16k

Step 2 16K is a first-party StepFun API model.

Step 2 16K Experimental

stepfun/step-2-16k-exp

Step 2 16K Experimental is a first-party StepFun API model.

Step 2 Mini

stepfun/step-2-mini

Step 2 Mini is a first-party StepFun API model.

Step 2X Large

stepfun/step-2x-large

Step 2X Large is a first-party StepFun API model.

Step 3

stepfun/step-3

Step 3 is a first-party StepFun API model.

Step 3.5 Flash 2603

stepfun/step-3.5-flash-2603

Step 3.5 Flash 2603 is a first-party StepFun API model.

Step ASR

stepfun/step-asr

Step ASR is a first-party StepFun API model.

Step ASR 1.1

stepfun/step-asr-1.1

Step ASR 1.1 is a first-party StepFun API model.

Step ASR 1.1 Stream

stepfun/step-asr-1.1-stream

Step ASR 1.1 Stream is a first-party StepFun API model.

Step Audio 2

stepfun/step-audio-2

Step Audio 2 is a first-party StepFun API model.

Step Audio R1.1

stepfun/step-audio-r1.1

Step Audio R1.1 is a first-party StepFun API model.

Step GUI

stepfun/step-gui

Step GUI is a first-party StepFun API model.

Step Image Edit 2

stepfun/step-image-edit-2

Step Image Edit 2 is a first-party StepFun API model.

Step R1 V Mini

stepfun/step-r1-v-mini

Step R1 V Mini is a first-party StepFun API model.

Step Router V1

stepfun/step-router-v1

Step Router V1 is a first-party StepFun API model.

Step TTS Mini

stepfun/step-tts-mini

Step TTS Mini is a first-party StepFun API model.

StepAudio 2 ASR Pro

stepfun/stepaudio-2-asr-pro

StepAudio 2 ASR Pro is a first-party StepFun API model.

StepAudio 2.5 ASR

stepfun/stepaudio-2.5-asr

StepAudio 2.5 ASR is a first-party StepFun API model.

StepAudio 2.5 TTS

stepfun/stepaudio-2.5-tts

StepAudio 2.5 TTS is a first-party StepFun API model.

Step 3.5 Flash

stepfun/step-3.5-flash

Step 3.5 Flash is StepFun's most capable open-source foundation model. It is tuned for lower latency and cost-sensitive production use.

Step TTS 2

stepfun/step-tts-2

Step TTS 2 is StepFun's most capable open-source foundation model.