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Kimi K3 is being released as open source with full weights scheduled to go public…

2026-07-16 · 23:04 UTC ·@alex_verem ·1 min read

Brief

Kimi K3 is an open-source model that Kimi.ai says hit #1 on the Frontend Code Arena with a 1,679 score; full weights are slated to drop July 27, 2026. Kimi.ai advertises 2.8T parameters, a 1M-token context, Kimi Delta Attention (up to 6.3x faster decoding) and ~25% training efficiency gains, available via Kimi.com and the Kimi API.

Why it matters

Kimi K3 is being released as open source with full weights scheduled to go public on July 27, 2026; Alex Verem reports it already holds the #1 spot on the Frontend Code Arena with a score of 1,679 (tweeted 2026-07-16).

Key details

  • Model specs announced by Kimi.ai: 2.8 trillion parameters, 1 million-token context window, native multimodal; Kimi Delta Attention claims up to 6.3x faster decoding in million-token contexts and Attention Residuals claim ~25% higher training efficiency at <2% additional cost.
  • Kimi K3 is live on Kimi.com, Kimi Work, Kimi Code and via the Kimi API (platform.kimi.ai); the company positions the model for long-horizon agentic coding and self-evolving workflows and claims the open weights will let anyone run it locally despite prior industry protection efforts.
Source evidence

BREAKING: the #1 model on the Frontend Code Arena is open source, and the full weights go public July 27.

Kimi-K3 hit 1,679 and put every frontier lab underneath it, ten days before anyone can even download it.

Everyone’s reading this as “open source finally caught up.” It didn’t catch up. It took the top spot outright.

So the thing labs spent billions to protect is about to be a free download you run on your own machine.

Kimi.ai (@Kimi_Moonshot)

Introducing Kimi K3: Open Frontier Intelligence

🔹 2.8 Trillion Parameters, 1 Million Context, Native Multimodal
🔹 Kimi Delta Attention enables up to 6.3x faster decoding in million-token contexts
🔹 Attention Residuals deliver ~25% higher training efficiency at <2% additional cost
🔹 Built for long-horizon agentic coding and self-evolving workflows

Kimi K3 is now live on on Kimi.com, Kimi Work, Kimi Code, and the Kimi API.
Open Weights by July 27, 2026.

🔗 API: platform.kimi.ai
🔗 Tech blog: kimi.com/blog/kimi-k3

— https://nitter.net/Kimi_Moonshot/status/2077830229968683203#m