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feat(provider): add StepFun Step Plan provider#1262

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sky-wang-salvation wants to merge 1 commit intoanomalyco:devfrom
sky-wang-salvation:add-stepfun-step-plan
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feat(provider): add StepFun Step Plan provider#1262
sky-wang-salvation wants to merge 1 commit intoanomalyco:devfrom
sky-wang-salvation:add-stepfun-step-plan

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Summary

Adds StepFun Step Plan (stepfun-step-plan) as a new provider in models.dev.

StepFun Step Plan is a subscription-based AI coding service by StepFun (阶跃星辰), using a distinct API endpoint from the standard StepFun provider.

Changes

  • providers/stepfun-step-plan/provider.toml — new provider definition
  • providers/stepfun-step-plan/models/step-3.5-flash.toml — Step 3.5 Flash model (the current model available under this plan)

Provider details

Field Value
Name StepFun Step Plan
Base URL https://api.stepfun.com/step_plan/v1
Auth env STEPFUN_API_KEY
npm @ai-sdk/openai-compatible
Docs https://platform.stepfun.com/docs/zh/step-plan/overview

Model: step-3.5-flash

  • 196B total params / 11B activated (sparse MoE architecture)
  • Optimized for agent and coding tasks
  • Supports reasoning, tool_call, temperature
  • Context window: 256K tokens
  • Cost: 0 (subscription-based plan at ¥49–699/month)

Notes

  • This is a separate provider from the existing stepfun provider because it uses a different base URL (/step_plan/v1 vs /v1) and has subscription-based pricing (cost = 0)
  • More models will be added to this plan by StepFun in future updates

Made with Cursor

Add StepFun Step Plan, a subscription-based coding plan offering by StepFun (阶跃星辰).

- Provider uses OpenAI-compatible API at https://api.stepfun.com/step_plan/v1
- Includes step-3.5-flash model (196B MoE, optimized for agent and code tasks)
- Cost set to 0 as this is a subscription-based service (¥49-699/month)
- Supports reasoning, tool_call, and temperature control

Ref: https://platform.stepfun.com/docs/zh/step-plan/overview
Made-with: Cursor
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