signal新智元zh source2026-09-21
刚刚，阶跃Step 5 Preview发布！一举杀进全球开源前三
StepFun released its flagship open-source model Step 5 Preview, scoring 44 on the AA Intelligence Index v4.2 to rank third globally among open-source models, with pricing at $1/M input and $2.7/M output tokens. The sparse MoE architecture uses 600B total parameters (27B activated) with 92 layers and 1M native context, enabling long-horizon agent tasks like contract review (120/120 checks), financial due diligence with exact-reconciliation spreadsheets, and deep research with hierarchical source validation. Its cost-performance sets a new Pareto frontier on the AA index's intelligence-vs-cost chart, competing directly with closed-source leaders like Claude Fable 5.1 (53) and GPT-6 Astra (52.8).
- why now
- Step 5开源模型发布，性价比领先，今起可用。
- evidence
- 4 sources carry this story · confidence medium
- topic
- AI Tech & New Models
- source
- 新智元
#Step 5 Preview#Agent#benchmark
score
score 9 out of 10. 0-10: how dense the facts are, multiplied by how much you can do with them after reading. 8+ means the topic's evidence bar is met: benchmarks and availability for a new model, amount and investors for a funding round, revenue figures for a solo-money story. Below 5 an item does not enter the digest. A press release scores 3 or less, a reprint loses 2, anything older than 14 days loses 1, a headline that misleads loses 3.
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