StepFun Step 5 open-weight rollout and benchmark validation

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Overview

Description StepFun is rolling out Step 5 Preview while seeking validation through benchmarks, OpenRouter usage and open-weight availability. Overview StepFun released Step 5 Preview with a 600B-parameter mixture-of-experts design, 27B active parameters and a 1M-token context window. Reports said it matched Kimi K3 on Artificial…

Possible scenarios

40%Step 5 Adoption Breakout+0.3%
28%Open-Model Price War-0.1%
18%Performance Disappointment Emerges-0.1%

For information only. Not investment advice.

Stories in this saga

4 stories, 16 sources

Sep 21, 2026
StepFun Step 5 Preview Matches Kimi K3 at 65% Lower Cost and Opens Weights Oct 15
- SpaceXAI Launches Grok 4.7 With 19.6% Legal Benchmark Score to Beat GPT 5.629 days ago
- Grok 4.7 Puts SpaceXAI in Top 4 AI Labs With 56 Coding Agent Index Score

StepFun Launches 600B Parameter Step 5 Model and Opens Weights Oct 1529 days ago

Sep 22, 2026

SpaceXAI Launches Grok 4.7 With Base Token Prices Unchanged

xAI Launches 2.1 Trillion Parameter Grok 4.7 to Overtake GPT 5.6 Sol in Coding28 days ago
StepFun Step 5 Preview Matches Kimi K3 Score of 44 at 2.8x Lower Cost Ahead of Oct 15 Weights Release29 days ago
Grok 4.7 Uses 125% More Output Tokens on Intelligence Benchmark29 days ago
Grok 4.7 Uses Over Twice the Tokens of Grok 4.6 in Intelligence Test29 days ago

Oct 12, 2026