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AI Daily Brief — 11 July 2025

A pivot day for the open-source/closed-source axis. Beijing’s Moonshot AI dropped Kimi K2, a 1T-parameter MoE that immediately topped open-weight charts. Hours later Altman delayed OpenAI’s open-weight release “indefinitely”. Google reverse-acquihired Windsurf for $2.4B, collapsing OpenAI’s $3B deal. xAI spent the day in damage-control mode after the MechaHitler episode.

Top stories

  • Moonshot AI open-sources Kimi K2 — 1T-parameter MoE. Mixture-of-experts with 1T total / 32B active parameters, 128K context, 384 experts (8 per forward pass), trained on 15.5T tokens with the custom MuonClip optimizer. Two variants on Hugging Face: Kimi-K2-Base and Kimi-K2-Instruct. 65.8 on SWE-Bench Verified — beats GPT-4.1 on several agentic-coding benchmarks. via MarkTechPost
  • Kimi K2 API pricing undercuts US frontier labs. Moonshot launched K2 on its own API at $1.35 / $4.00 per million input/output tokens — a fraction of Claude 4 Opus and GPT-4.1 list prices. Repo at MoonshotAI/Kimi-K2 on GitHub. via GitHub
  • OpenAI delays open-weight model “indefinitely”. Sam Altman announced OpenAI is pushing back the long-promised open-weight model “indefinitely” for additional safety testing. Already pushed from a planned summer launch. Altman: “once weights are out, they can’t be pulled back.” Delay landed the same day Moonshot shipped K2, sharpening the optics. via TechCrunch
  • Google reverse-acquihires Windsurf for $2.4B. Hours after OpenAI’s exclusivity window on its planned $3B Windsurf acquisition expired, Google hired CEO Varun Mohan, co-founder Douglas Chen and ~40 senior R&D staff into Google DeepMind, plus a non-exclusive license to Windsurf tech. Payment split: $1.2B investor payout / $1.2B employee comp. Windsurf the company kept its IP and remaining staff. via CNBC
  • OpenAI’s Windsurf acquisition officially collapses. Its largest attempted acquisition formally fell apart as the exclusivity period expired. Tensions with Microsoft over IP access were the proximate cause; the failure cleared the path for Google’s same-evening swoop on Windsurf’s leadership. via TechCrunch

Who shipped

Moonshot AI shipped Kimi K2. OpenAI shipped a delay. Google shipped a reverse-acquihire.

Open-source pulse

Kimi K2 is the strongest open-weight launch of mid-2025 — closes the gap with Claude 4 Opus on coding/agentic tasks at a fraction of the price. The Modified MIT license requires “Kimi K2” attribution only above 100M MAU or $20M MRR; below that it functions as standard MIT.

Money, infra & hardware

NVIDIA held its first-ever $4T market cap into Friday close — first publicly traded company to reach the mark, added its fourth trillion in roughly a year. Perplexity’s Comet browser hit its first full week of availability to Max ($200/month) subscribers.

Quiet corners

xAI spent the day in apology mode over Grok 4’s MechaHitler outbursts from July 8 even as the raw Grok 4 benchmarks impressed. Hugging Face Daily Papers logged 653+ upvotes on the top submission. EU Commission moved on GPAI guidelines ahead of August 2 AI Act milestone.

By the numbers

  • 1T / 32B / 128K / 15.5T — Kimi K2 total / active / context / training tokens
  • 384 / 8 — Kimi K2 total experts / activated per forward pass
  • 65.8 — Kimi K2 on SWE-Bench Verified
  • $1.35 / $4.00 — Kimi K2 API per million input/output tokens
  • $2.4B / $3B — Google’s Windsurf reverse-acquihire / OpenAI’s collapsed deal
  • 40 — Windsurf R&D staff moved to Google DeepMind

Compiled by AI Feed’s editor from verified web sources for 11 July 2025.