feat(stepfun-ai): add step-5-preview - #7657
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rekram1-node merged 1 commit intoSep 21, 2026
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StepFun's flagship base model, verified live on the Global PAYG gateway (api.stepfun.ai/v1). Reuses existing lab metadata (models/stepfun/step-5-preview.toml): 1M-token context/input, text/image/video input, reasoning + tool calling + structured output, closed weights. Provider override: reasoning_effort accepts low/medium/high; reasoning side channel is reasoning_content; per-token cost input 1.00, output 2.70, cache_read 0.05 USD/MTok. Standalone file (not symlinked to providers/stepfun) because China (api.stepfun.com) is unverified with a Global key (401). Global Step Plan (step_plan/v1) verified absent for this model, so not added there. Sources: - https://platform.stepfun.ai/docs/en/guides/models/step-5-preview - https://platform.stepfun.ai/docs/en/guides/pricing/details - GET https://api.stepfun.ai/v1/models (accessed 2026-09-21) bun validate passes.
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Summary
Adds
step-5-previewto thestepfun-ai(Global PAYG) provider, which serves it atapi.stepfun.ai/v1but has no catalog entry, sostepfun-ai/step-5-previewis unselectable in OpenCode. Reuses existingstepfun/step-5-previewlab metadata +base_modeloverride pattern.Data sources (all accessed 2026-09-21)
reasoning_efforton Chat,output_config.efforton Messages).GET https://api.stepfun.ai/v1/modelslistsstep-5-previewwithreasoning_effort_support_list: ["low","medium","high"],max_input_tokens: 1024000,supported_protocols: ["chat","messages","responses"];POST /v1/chat/completionssucceeds with areasoning_contentside channel.Files
providers/stepfun-ai/models/step-5-preview.toml(new, override-only): effort low/medium/high,[interleaved] field = "reasoning_content",[cost]1 / 2.7 / 0.05.providers/stepfun-ai/provider.toml: effort comment extended to step-5-preview; Responses line updated (API reportsresponsessupport).Judgment calls
providers/stepfun/: China (api.stepfun.com) returns 401 for a Global key, so parity is unverified — happy to convert to canonical+symlink if a maintainer confirms.stepfun-ai-step-plan: Global Step Plan/modelsreturns only 3.5 models for a working key.output = 1M: inherited lab value per feat(stepfun-step-plan): add step-5-preview #7544 precedent; flagging in case an override is preferred.temperature/knowledgeomitted (undocumented).Validation
bun validatepasses; resolved entry merges as expected.