AI BriefingStep 5 Preview now available on AI Gateway
Key point
StepFun's flagship model supports text and image input with a 1M-token context window for agentic coding and analysis.
Details
Step 5 Preview, StepFun's flagship model, is now available on AI Gateway. It is designed for agentic coding, professional knowledge work, and financial analysis, handling tasks from building apps and debugging code to generating research and analytical reports.
The model supports both text and image input with a 1M-token context window. This capacity allows users to process large codebases, stacks of documents, or screenshots and charts within a single request.
Integration and Usage
To use the model, specify stepfun/step-5-preview as the model name. For coding agents such as Claude Code, Codex, and Cursor, users must install the latest Vercel CLI and run setup, then select the model within the agent. The model is also accessible via the model playground.
AI Gateway Features
AI Gateway provides a unified API for calling models, tracking usage and cost, and configuring retries, failover, and performance optimizations to achieve higher-than-provider uptime. Key features include:
- Built-in custom reporting
- Zero Data Retention support
- Budgets for API keys
- Routing rules
The gateway reflects provider pricing with no markup and charges no platform fee on inference, including for Bring Your Own Key (BYOK) requests.
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