Block-sparse attention reduces N² scaling to make 1M context windows feasible; 9x prefill, 15x decode speedup over dense attention at the cost of reimplementing attention kernels and multimodal preprocessing pipelines.
June 3, 2026
Summary
Long-context inference (codebases, documents, agentic loops) becomes cost-competitive. Developers targeting production agentic systems can now evaluate a model built for tool-use at scale without prohibitive latency or KV-cache overhead.
Why it matters
Long-context inference (codebases, documents, agentic loops) becomes cost-competitive. Developers targeting production agentic systems can now evaluate a model built for tool-use at scale without prohibitive latency or KV-cache overhead.
Implementation verdict
Replaces dense attention implementations and KV-cache management strategies. Requires custom kernel work (block-major reordering, sparse paged attention integration, decode scoring optimization) and gateway-level multimodal preprocessing. Ready now via Together AI endpoint; self-hosted deployment demands kernel engineering expertise.
Sources
Dev Signal
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