OpenAI vs StepFun
Relationship
StepFun's own GitHub README for its Step1X-Edit image-editing model explicitly benchmarks itself against OpenAI's GPT-4o.
9 of 17 capabilities — Shares agent orchestration, agentic coding, code generation and 6 more.
Ludbee capability tags · from the product recordsShared product type — Both ship AI agent, application and model API.
Ludbee product recordsSmaller scale — StepFun: $10B valuation, against OpenAI's $852B valuation.
Ludbee scale figures · valuation, market cap or revenue estimateSourced competitor — “We introduce a state-of-the-art image editing model, Step1X-Edit, which aims to provide comparable performance against the closed-source models like GPT-4o and Gemini2 Flash.”
github.com · checked 2026-09-19Create images and video — Rivals on this job — Produce and edit images, video and 3D assets — from a prompt, or by editing what you already have.
Ludbee needs vocabulary · the scope on the sourced edgeAligned comparison
Capability overlap
Shared · 9
Not verified for StepFun · 8
Recorded for OpenAI. StepFun’s product records say nothing either way — a missing record is not a missing capability.
Not verified for OpenAI · 3
Recorded for StepFun. OpenAI’s product records say nothing either way — a missing record is not a missing capability.
Products, side by side
Hand-checked pairing
OpenAI
Application
Assistant for chat, web search, file analysis and image generation, used in the browser and in desktop and mobile apps; developers can build custom in-chat apps for it via the Apps SDK, built on the Model Context Protocol.
OpenAI's agentic web browser. Deprecated on 9 August 2026, with its browser-based agentic capabilities moved into ChatGPT and Codex.
A version of ChatGPT that US government agencies deploy in their own Microsoft Azure commercial or Azure Government cloud, so the agency manages its own security, privacy and compliance.
ChatGPT in the Excel ribbon: builds and edits spreadsheets, formulas and formatting from plain-language requests, answers questions about what is in the workbook, and asks permission before changing it. OpenAI's own page bundles this with a separate ChatGPT for Google Sheets add-in; this record covers the Excel add-in only.
ChatGPT in the PowerPoint ribbon: creates new slides, rewrites and restructures an existing deck, and turns notes, documents or spreadsheets into presentation-ready content while keeping the output editable in PowerPoint.
ChatGPT in a Microsoft Word sidebar: drafts, revises and reorganizes the open document from notes or pasted source text, pulling in context from connected apps like Outlook, SharePoint, Google Workspace and Dropbox.
OpenAI's text-to-video product. The web and app experiences were discontinued on 26 April 2026; the API will be discontinued on 24 September 2026.
AI agent
Coding agent that reads, edits and runs a codebase from the terminal, an IDE extension and the ChatGPT web app.
Model API
Hosted API for OpenAI's text, image, audio and embedding models, billed per token.
StepFun
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
A one-click cloud-deployed AI agent offered inside the 阶跃AI assistant that interprets instructions and carries out tasks autonomously.
Model API
API access to StepFun's text, vision, speech and image models, with credit packages and enterprise plans.
No counterpart
OpenAI sells these in a stack layer with no product recorded for StepFun yet — nothing on the other side to compare them against.
Agent platform
OpenAI's cybersecurity offering, bringing together frontier cyber models, Codex Security and partner workflows to find, validate and fix vulnerabilities, with an access-gated Daybreak Red tier for authorised vulnerability research and red teaming.
Enterprise platform for connecting AI agents to systems of record and running them under enterprise identity, access and observability controls.
StepFun sells these in a stack layer with no product recorded for OpenAI yet — nothing on the other side to compare them against.
API 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.
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.