Other

StepFun: Step 5 Preview

stepfun/step-5-preview

canonical: stepfun/step-5-preview-20261008

Audio inside a video clip

Cannot hear clip audioprobed 2026-10-22

Probed: missed a spoken codeword inside the clip. Any comment it makes on sound is invented.

What it answered

SHAPE: yellow square
AUDIO: NONE

Descriptionfrom OpenRouter

Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...

Context length

1,000,000 tok

Max completion

64,000 tok

Knowledge cutoff

—

Expires

—

Added to OpenRouter

10/8/2026

Cache last refreshed

11/12/2026

Primary modality

text+image+video->text

Source

OpenRouter

Input modalities

textimagevideo

Output modalities

text

Pricing

Field	Per token (USD)	Per million
prompt	0.000001	$1.00
completion	0.0000027	$2.70
input_cache_read	0.0000001	$0.100

Supported parameters(19)

frequency_penaltyinclude_reasoninglogprobsmax_tokensmin_ppresence_penaltyreasoningreasoning_effortrepetition_penaltyresponse_formatseedstopstructured_outputstemperaturetool_choicetoolstop_ktop_logprobstop_p

Default parameters

{
  "temperature": null,
  "top_p": null,
  "top_k": null,
  "frequency_penalty": null,
  "presence_penalty": null,
  "repetition_penalty": null
}