{"name":"StepFun API","tagline":"API for Step-2/Step-3 family of frontier MoE models from Shanghai.","url":"https://platform.stepfun.com","category":"models-api","pricing":"paid","price_note":"Step 3.7 Flash ~$0.20/$1.15 per 1M; Step 3.5 Flash open-source $0.10/$0.30; Step-2 ~$0.83/$2.50; Step-2-mini ~$0.14/$0.42; Step-1.5V ~$0.42/$1.25; Step-R ~$1.11/$3.33","free_tier":true,"open_source":false,"api":true,"self_host":false,"model_routing":"locked","verdict":"situational","verdict_text":"Step 3.7 Flash is cheap, open weights, and scores well on coding and math benchmarks. Step-2 is a capable closed model at mid-tier prices. Brand recognition and docs outside China are weak, and access often runs through resellers.","limitations":["The hosted API is proprietary; Step 3.5 Flash and Step 3.7 Flash weights are separate open-weight releases.","StepFun runs separate China (platform.stepfun.com) and global (platform.stepfun.ai) platforms with non-interchangeable API keys.","Lower Western brand recognition; docs mostly Chinese.","Mixed access outside China; often reached via resellers.","Step-2 is closed, unlike Step 3.5 Flash and Step 3.7 Flash.","Smaller model family than Qwen or Tencent."],"strengths":["Step 3.7 Flash is cheap, open weights, and strong on coding and math.","Step-2 is a capable closed model at mid-tier prices.","The family covers text, vision, and reasoning variants."],"use_for":["Cost-sensitive coding and math workloads that fit the Flash SKUs.","Teams that want Step-2's closed-model quality without premium pricing."],"skip_when":["You need strong Western brand recognition and English-first docs.","You want one API key that works across China and global platforms.","You need a model family as broad as Qwen or Tencent."],"receipts":["https://platform.stepfun.ai","https://github.com/stepfun-ai/Step-3.7-Flash","https://apirank.vip/zh/tutorials/stepfun-api-review/","https://tokenmix.ai/blog/step-3-5-flash-review-stepfun-2026"],"affiliate":"none","evidence_tier":"source-verified","momentum":"blueshift","featured":false,"last_verified":"2026-08-24","observed_by":"whysanesanders","slug":"stepfun-api","canonical_url":"https://noemium.com/tools/stepfun-api/","attribution":"Noemium catalog data is licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). See https://noemium.com/method/ for how entries are verified."}