Kimi K3 hits Amazon Bedrock with 2.8T params

Moonshot AI's Kimi K3 arrives on Amazon Bedrock as AWS continues to widen its catalog of open-weight models. The post notes that since 2025, Bedrock has added dozens of open-weight models from providers including DeepSeek, Google, MiniMax, Mistral AI, Moonshot AI, NVIDIA, OpenAI, and Qwen. In 2026, Bedrock also added platform-level capabilities such as tool calling, structured output, reasoning, response streaming, and the Responses and Chat Completions APIs. Because those are platform features rather than per-model integrations, newer open-weight models can pick them up as they land on Bedrock.

On the model itself, the post positions Kimi K3 for long-running coding and knowledge workflows that need sustained context across large repositories, documents, and images. It pairs native vision with a 1-million-token context window and an approximate 2.5x improvement in scaling efficiency over Kimi K2, and it is described as the first open-weight model on Bedrock to support explicit prompt caching — a mechanism that lets requests reuse a marked prompt prefix instead of resending it. For teams weighing cost and latency against data control, the post also notes that data is processed within the AWS data boundary, is not shared with the model provider, and is not used for training, with zero data retention always enabled for inference requests.

What that amounts to in practice is likely to depend less on the headline capability than on how well prompt-caching fits a given workload. Explicit caching charges more for tokens written to cache and keeps them for at least 30 minutes, so the payoff hinges on whether a team reuses the same long, stable context often enough to hit the cache before it expires. The choice between the global and US profiles adds a second trade-off — AWS says the global profile costs about 10% less than a geographic one, while the US profile keeps processing within US geography for data-residency requirements. Buyers with strict residency or cost rules may find those two dials, rather than raw model specs, determine whether Kimi K3 earns a place in production.