StepFun
Step Plan is a subscription access plan within StepFun Open Platform. The docs present it as a separate commercial route for supported models and integrations, with a dedicated base URL at https://api.stepfun.ai/step_plan/v1. It references tools such as OpenClaw, Claude Code, Trae, Cursor, Cline, Goose, OpenCode, Kilo Code, Roo Code, Zed and Hermes-Agent as supported integration paths, but the product itself is a plan and routing layer rather than a coding tool.
Editorial verdict
Developers who want a predictable subscription quota for coding agents, long-context repository work and tool-calling automation.
Avoid it when you need MCP at launch, a generic direct API balance model, or tools not covered by Step Plan integrations.
Step Plan deserves a separate AI Coding entry because it is toolchain- and agent-workflow specific, not just a model API.
Flash Mini starts at $6.99; Flash Plus $9.99; Flash Pro $29; Flash Max $99
WeChat Pay, Stripe for overseas users, Subscription quota
Use is governed by the Step Plan paid service agreement and supported-tool terms; account balance and Step Plan quota are separate.
Agent workflows can expose repository context and tool actions; review StepFun terms and each coding tool's data policy.
Use the documented Claude Code integration with the Step Plan endpoint when testing Step 3.5 Flash for coding agents.
The docs position Step 3.5 Flash as optimized for low-latency long-running tool-calling agent workflows.
Subscription prompts and weekly limits can be easier to manage than raw token billing for frequent tool use.
Step Plan model coverage and promotional pricing can change; confirm in the plan page before subscribing.
Both are subscription-style plans for coding and agent usage.
Kimi Code is a productized coding-agent path rather than a model-plan backend.
docs · en · verified 2026-08-04
Documents subscription pricing, supported models, supported tools and FAQ.
Last checked: 2026-08-04