Kimi Linear: An Expressive Hybrid Linear Attention Architecture

ArticleKimi Team (Yu Zhang et al.)Research

The Kimi Team presents Kimi Linear, a hybrid linear attention architecture that outperforms standard full attention across short-context, long-context, and RL scaling scenarios. It cuts KV cache consumption by up to 75% and boosts decoding throughput up to sixfold on 1M token contexts.

Key points

  1. Combines Kimi Delta Attention (KDA) and Multi-Head Latent Attention (MLA) in a layerwise hybrid setup.
  2. KDA enhances Gated DeltaNet with finer-grained gating for more effective finite-state RNN memory use.
  3. Employs a custom chunkwise algorithm with a specialized Diagonal-Plus-Low-Rank (DPLR) matrix variant to reduce computational overhead.
  4. Pretrained with 3B activated parameters and 48B total parameters, outperforming pure MLA under an identical training recipe.
  5. Reduces KV cache memory usage by up to 75% and achieves up to 6x decoding throughput for 1M context lengths.
  6. Releases the KDA kernel, vLLM integration, and pretrained as well as instruction-tuned model checkpoints as open source.

Why it matters

Full attention mechanisms scale quadratically and create memory bottlenecks at long context lengths. Kimi Linear demonstrates that linear attention can serve as a viable drop-in replacement without compromising model quality across tasks.

Analysis

Linear attention models traditionally struggled to match standard attention accuracy across varied tasks. By combining improved gating in KDA, efficient chunkwise DPLR computation, and hybridization with MLA, the researchers provide a scalable architecture ready for production inference via vLLM.

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

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