kimi-k3-mlx: Apple Silicon Port of the 2.78T Multimodal MoE Kimi-K3

RepositoryPipeNetwork/kimi-k3-mlxTool

kimi-k3-mlx is an Apple MLX port of Moonshot AI's native multimodal MoE model Kimi-K3 (2.78T total parameters). Because the model exceeds the memory capacity of any single Apple Silicon machine, the repository includes a custom streaming converter, vision components, and expert-pruning tools.

Key points

  1. 2.78 trillion total parameters (104 billion active), featuring 896 routed experts (top-16), 2 shared experts, and a 1M token context.
  2. Architecture incorporates Kimi Delta Attention (KDA), gated Multi-Head Latent Attention (MLA), Attention Residuals (AttnRes), and SiTU-GLU activations.
  3. Custom streaming converter replaces standard mlx_lm convert, preventing out-of-memory errors on the 5.6 TB bf16 source model.
  4. Provides REAP expert pruning tools and per-language expert-overlap analysis.
  5. Cannot run on a single Mac due to a minimum footprint of ~870 GB versus the existing 512 GB Apple Silicon unified memory ceiling.

Why it matters

Kimi-K3 highlights the architectural and hardware limits of running frontier MoE models on Apple Silicon. It establishes key building blocks for MLX, including custom attention layers and streaming weight conversion for models that exceed multi-terabyte thresholds.

Analysis

This project is aimed at ML engineers and researchers exploring novel MoE structures, such as LatentMoE and KDA, within the MLX ecosystem. The codebase addresses practical conversion bottlenecks through streaming pipelines. While the port features high technical fidelity—such as evaluating SiTU-GLU in fp32 to prevent rounding errors—its operational deployment remains restricted by current Apple Silicon hardware ceilings.

Found in

Summary generated by AI (Gemini 3.8 Flash, 27 September 2026). It may contain errors – the original source is authoritative.

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Locations

  • Mattersburg
    Johann Nepomuk Bergerstraße 7/2/14
    7210 Mattersburg, Austria
  • Vienna
    Ungargasse 64-66/3/404
    1030 Wien, Austria

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