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step-3

StepFun
Model overview

step-3

Step-3 is a multimodal reasoning model.

general LLMreasoningmultimodalvision-languagechatdocument understandingenterprise access
CompareCompanyRankingsPublic signals
Representative version

step-3

CompanyStepFun
ReleaseNot disclosed
Release typeModel release
ParametersNot disclosed
ArchitectureNot disclosed
Context64,000
Input modalitiestext / image
Output modalitiestext
Tool use / function callingNot disclosed
Structured output / reasoningConfirmed: Reasoning
Vision / audio / videoConfirmed: Vision
Open weights / LicenseWeight status not disclosed / license not disclosed
stepfun-step-3-phase-3-5 · License source pending verification
Vendor APINot disclosed
API source pending verification
OpenRouterNeeds confirmation
PricingOpenRouter candidate (needs confirmation) · 2026-07-15: $0.1 / $0.3
input / output, per 1M tokens
BenchmarkLMArena 2 rows
Public signalsNo reliable public source
Use casesassistant chat / document understanding / enterprise API / general text tasks
Claim evidenceRelease / model specs / weightsStepFun model capability overviewstep-3
OpenRouter

Pricing / context / availability

OpenRouterNeeds confirmation
OpenRouter listingstepfun/step-3.5-flash
Mapped versionstep-3
stepfun-step-3-phase-3-5
PricingOpenRouter candidate (needs confirmation) · 2026-07-15: $0.1 / $0.3
input / output, per 1M tokens
Context262144
Speed/LatencyNo reliable public source
Snapshot time2026-07-15T20:11:41.551Z
SourceView source
Benchmark

Ranking evidence

SourceTaskRankScoreSampleTimeLink
LMArenaCoding1521,407.121,2342026-05-07View source
LMArenaText overall1651,347.946,5512026-05-07View source
Evidence gaps

Public display boundary

Parameter scale not disclosedRelease date not disclosedOpenRouter not separately verifiedNo public model-card activity countersNo linkable real reviewSpeed/latency not disclosed