StepFun

10 cards, from Sep 2024 to Sep 2026. 4 with open weights.

StepFun docs On Hugging Face Filter the binder

Latest

StepFun

Step 5 Preview

CTX1.02M

Preview

83Quality

Reasoning · Vision · Tools

Input$1/M

Output$2.70/M

StepFun's next-generation flagship base model for coding and professional knowledge work, with native text, image, and video input and a 1M-token context window

PaidProprietary1006/1040

StepFun

Step 3.7 Flash

CTX256K

Reasoning · Vision · Tools

Input$0.18/M

Output$1.11/M

Newer StepFun flash model for faster agents, coding, and multimodal prompts

Open weightsApache 2.0910/1040

StepFun

StepAudio 2.5 ASR

CTX—

Speech to text

Input—

Output—

Speech transcription model for accurate audio-to-text and captioning workflows

PaidProprietary893/1040

StepFun

StepAudio 2.5 TTS

CTX—

Text to speech

Input—

Output—

Speech generation model for controllable voice, narration, and audio delivery

PaidProprietary871/1040

Timeline

2026
1. Sep 2026
  - Sep 16Step 5 PreviewTextPaid
2. May 2026
  - May 29Step 3.7 FlashTextOpen weights
3. Apr 2026
  - Apr 24StepAudio 2.5 ASRTranscriptionPaid
  - Apr 16StepAudio 2.5 TTSAudioPaid
  - Apr 2Step 3.5 Flash 2603TextOpen weights
4. Mar 2026
  - Mar 1Step TTS 2AudioPaid
5. Jan 2026
  - Jan 29Step 3.5 FlashTextOpen weights
2025
1. Jan 2025
  - Jan 1Step 2 (16K)TextPaid
  - Jan 1Step 1 (32K)TextPaid
2024
1. Sep 2024
  - Sep 12GOT-OCR2_0TextOpen weights

Dates are release dates from models.dev; for open models found on Hugging Face, the day the repo was published.

Latest

Step 5 Preview

Step 3.7 Flash

StepAudio 2.5 ASR

StepAudio 2.5 TTS

Timeline

2026

2025

2024