signal量子位zh source2026-09-21
开源Top2！实测阶跃Step 5 Preview，真有点猛啊…
阶跃星辰发布Step 5 Preview旗舰基座模型（MoE架构，600B总参数/27B激活参数，1M上下文），在Artificial Analysis评测中以44分位列全球开源Top 2，定价百万输入1美元、百万输出2.7美元，单任务成本仅为Opus 5的12.5%。实测中该模型能自主操控Blender构建含后期特效的3D后室场景、制作《LEGO Racers》风格赛车游戏及霓虹跑酷游戏，Agent能力显著提升；技术层面采用92层窄深Transformer架构与Sparse MoE/GQA稀疏化设计，通过Long-horizon RL和Context Compaction保证数十轮工具调用后的任务连续性，延续了阶跃以可控成本提供Frontier级能力的路线。
- why now
- 阶跃Step 5 Preview发布，低成本高性能，值得立即关注。
- evidence
- 4 sources carry this story · confidence medium
- topic
- AI Tech & New Models
- source
- 量子位
#Step 5 Preview#Agent
score
score 8 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.
read the source