Sierra vs StepFun

Sierra — Application · Private · $15.8B valuation · 4 of 4 figures sourced  |  StepFun — Foundation Models · Private · $10B valuation · 2 of 2 figures sourced

Relationship

Assembled from the recorded fields for this pair, not hand-checked. The comparison below is read from each company’s own profile.

Aligned comparison

FieldSierraStepFun
Valuation$15.8B$10B StepFun has 37% less
Employees549—
Founded20232023 match
StatusPrivatePrivate match
CategoryApplicationFoundation Models
Stack layerAI agent, Application, Developer toolAI agent, API service, Application, Developer tool, Model API
HeadquartersSan Francisco, USAShanghai, China

Capability overlap

Shared · 4

Agent orchestrationText generationVoice agentWorkflow automation

Not verified for StepFun · 3

Customer supportData analysisEvaluation and observability

Recorded for Sierra. StepFun’s product records say nothing either way — a missing record is not a missing capability.

Not verified for Sierra · 8

Agentic codingCode generationImage generationModel inferenceKnowledge retrievalSpeech to textText to speechSearch answers

Recorded for StepFun. Sierra’s product records say nothing either way — a missing record is not a missing capability.

Products, side by side

Algorithmic pairing — assembled from recorded fields, not hand-checked

Sierra

Application

Agent StudioApplication

Empower customer experience teams to build and manage agents—without writing a line of code. Set up customer journeys, configure knowledge, and define brand guidelines effortlessly.

ChannelsApplication

Create consistent experiences across voice, chat, email, and more in 58 languages, available 24/7/365.

ExplorerApplication

Ask any question in natural language, and Explorer will use analytics and sample customer conversations to provide answers and actionable recommendations.

GhostwriterApplication

Build or modify your agent simply by describing how you want your agent to behave. Prompt workflows, systems integrations, guardrails, tone, and style.

HorizonApplication

Long-horizon agents that get more intelligent with every interaction.

InsightsApplication

Measure what matters, test what works, and understand every agent decision with analytics, experimentation, and observability built for continuous improvement.

AI agent

SierraAI agent

Platform for building and running customer-facing agents that handle support conversations over chat and voice.

Developer tool

Context EngineDeveloper tool

Supplies persistent customer context and behavioral signals to Sierra's conversational agents.

StepFun

Application

阶跃AI (StepFun AI)Application

StepFun's consumer AI assistant, available on the web and as Windows and macOS desktop clients, offering web search, knowledge-base Q&A, image creation, tool use and speech recognition.

AI agent

StepClawAI agent

A one-click cloud-deployed AI agent offered inside the 阶跃AI assistant that interprets instructions and carries out tasks autonomously.

Developer tool

阶跃星辰 AI Studio (StepFun AI Studio)Developer tool

A browser-based workspace for building, testing and deploying AI applications on StepFun's models, with a playground, a showcase library of example apps and a personal asset library.

No counterpart

StepFun sells these in a stack layer with no product recorded for Sierra yet — nothing on the other side to compare them against.

API service

Step PlanAPI service

A subscription service from the StepFun Open Platform that supplies a monthly Credit pool for calling StepFun's flagship models from third-party coding tools and agent clients such as Claude Code, Cursor, OpenClaw, Cline and Zed.

Model API

StepFun Open PlatformModel API

API access to StepFun's text, vision, speech and image models, with credit packages and enterprise plans.