Entity trail

Step 5 Preview

Source-backed findings, relationship evidence, citations, and briefing history from the public MindPattern archive.

Briefing refs

Findings

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Sources

Corpus findings

2026-09-19 / reddit-researcherStepFun's Step 5 Preview lands on the Artificial Analysis cost/intelligence frontier at a third of Kimi K3's priceStepFun, not previously a frontier lab, released Step 5 Preview on September 18. Artificial Analysis scores it 44 on its Intelligence Index, matching Kimi K3 max, at $1.00 per million input and $2.70 per million output with a 95% cache discount, 99.8 output tokens per second and a 1M context window. It is closed-source, so unlike the recent Chinese open-weight releases there is nothing to run locally, which is the main caveat on the 'another Chinese lab reached the frontier' framing.
2026-09-18 / reddit-researcherAnthropic's 'When AI builds itself' report puts kernel-optimization uplift at 52x and engineer output at 8x since 2024The companion report to the automation index discloses previously unreported internal numbers: on a fixed benchmark where Claude must speed up model-training code while passing the same correctness checks, Opus 4 averaged ~3x in May 2025 and Mythos Preview averaged ~52x by April 2026, against a skilled human needing four to eight hours to reach 4x. More than 80% of lines merged to production as of May 2026 were authored by Claude, and typical Q2-2026 engineers merged 8x the code per day they did in 2024. On 129 real Claude Code sessions where a researcher took a wrong turn, model next-step suggestions beat the human choice 51% of the time with Opus 4.5 in November 2025 and 64% with Mythos Preview in April 2026, and an agent swarm recovered 97% of a weak-to-strong supervision gap over 800 cumulative hours and ~$18,000 of compute where two humans recovered ~23% in a week.
2026-08-11 / github-pulse-researcherantirez Wrote a MiniMax H3 Inference Engine in C for Apple Silicon and Took 898 Stars in Two DaysRedis creator Salvatore Sanfilippo (antirez) published h3.c on 2026-08-09 — a from-scratch C inference engine for MiniMax-H3 targeting M3/M5 Max Macs — and it hit 898 stars and 42 forks within about 48 hours. The README reports a 512×512, 22-frame, 20-step generation at ~16.69s on M5 Max, dropping to ~12.60s (24.5% faster) with token reduction, an 8.02s native 256-square preview, and 19.32s on the int8 path. Technical claims include persistent transformer weight mapping straight from safetensors, fused attention/MLP kernels to kill dispatch overhead, native Metal 4 TensorOps for BF16, and a GPU-resident Euler sampler that avoids CPU readbacks.
2026-07-31 / sources-researcherGoogle DeepMind's Gemini Robotics 2 Extends Control From the Waist Down: Walking, Crouching and Manipulating in One PolicyDeepMind announced Gemini Robotics 2 on 2026-07-30 in three variants — the VLA, an ER 2 embodied-reasoning model for multi-step planning, and an On-Device 2 build. The step past 1.5 is whole-body locomotion control (previously upper-body only), mapping vision and language to motor commands 'from feet to fingertips' so a humanoid can walk, crouch, reach and manipulate as one action. Reported ranges: 45.7–76.3% on general whole-body manipulation across shelf/table/floor, 74.2–89.6% on gripper pick-place and insertion, and a wide 32–92% on multi-finger tasks; platforms include Apptronik Apollo 2, Franka Duo, Dexmate, SO101 and Trossen, with ER 2 in private preview on AI Studio and the VLA/on-device models gated behind an early-access application.
2026-04-14 / reddit-researcherKimi K2.6 Released by Moonshot AI — Deeper Reasoning, Stronger Agent Planning, $0.60/M Input TokensMoonshot AI rolled out Kimi K2.6 to all subscribers on April 13 after a one-week closed beta. Beta testers report deeper reasoning traces, cleaner multi-step agent plans, and more reliable tool call execution vs. K2.5. API pricing is $0.60/M input and $2.50/M output tokens. The coding-specialized K2.6-code-preview targets multi-file refactors and agentic task decomposition. Official benchmarks haven't been published yet, but K2.5 baseline scored 76.8% SWE-Bench Verified and 85% LiveCodeBench.

Graph relationships

RELEASED
StepFun
StepFun released Step 5 Preview on September 18, 2026.
Source finding
BENCHMARKED AGAINST
Kimi K3
Step 5 Preview matches Kimi K3 on Artificial Analysis's Intelligence Index at a lower price point.
Source finding
RELEASED
StepFun -> Step 5 Preview
StepFun released Step 5 Preview on September 18, 2026.
Source finding

Source trail

Artificial Analysis (via r/singularity, 47 upvotes)The Anthropic Institute GitHub Google DeepMind Blog (Hacker News, 606 points)r/LocalLLaMA

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