Model

Step-1

CLOSED

StepFun · Step-1 family · released Mar 1, 2024

StepFun's debut 100B+-parameter bilingual LLM, publicly launched March 2024; offered via API in 8K/32K/128K/256K context variants (step-1-8k/32k/128k/256k per StepFun's model list docs), since superseded by the Step-3.x series and dropped from current pricing.

ReasoningCodingVisionFunction callingTool useAgentic

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Elo · unrated

Parameters

100B

Active params

100B (dense)

Context

256K tokens

Architecture

Dense transformer, 100B+ params, bilingual (Chinese/English)

License

Proprietary

Languages

API price (in/out)

No hosted API

Modalities

text

Benchmark results

Bar shows position within the tracked field; marker = field best

Run it locally

Closed weights — available via API only. No local deployment.

Input / M tok

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Output / M tok

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Step-1 family

Elo progression across releases

Step-1Mar 20241000.0 Step-1VSep 20241978.9

Resources

DOCSplatform.stepfun.com

API price — · each benchmark row carries its own source badge (see methodology)