@ArtificialAnlys evaluated StepFun Step 5 Preview (600B-total / 27B-active MoE): Artificial Analysis Intelligence Index 44, matching Kimi K3 (max) at about $0.72 per Index task (~2.8x cheaper). Pricing is about $1/$2.70 per 1M input/output tokens with $0.05/M cached input; 1M context; open weights planned for October 15. It still lags peers on agentic evals such as GDPval-AA and Terminal-Bench 4.0.

Key Takeaways

  • ✓AA Intelligence Index 44, tied with Kimi K3 (max); ~$0.72/task (~2.8x cheaper).
  • ✓Pricing ~$1/$2.70 per 1M in/out with $0.05/M cached input; 600B/27B MoE; 1M context.
  • ✓Open weights planned Oct 15; still trails peers on GDPval-AA and Terminal-Bench 4.0.
Artificial Analysis: StepFun Step 5 Preview scores 44 on Intelligence Index at ~2.8x lower cost than Kimi K3
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Key Decision Metrics at a Glance

TL;DR Verdict
🏆 Benchmark RankRank
Open weights planned Oct 15; still trails peers on GDPval-AA and Terminal-Bench 4.0.
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Kimi K3 · in: $3 / out: $15
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Step 5 Preview · StepFun · Artificial Analysis
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Up NextStepFun opens Step 5 Preview weights: 600B/27B sparse MoE agent flagship with 1M context now on Hugging Face and ModelScope
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