A trillion-parameter open model, free to download. What changes and what does not

Moonshot AI released Kimi K2 this week: a mixture-of-experts model with about a trillion total parameters and roughly thirty-two billion active per answer, published under a permissive licence and aimed explicitly at agentic use — using tools, writing code, carrying out multi-step tasks.

A trillion parameters sounds like the story. It is not, for the same reason the March post on a 32-billion model was not about the number.

What the architecture means practically

A mixture-of-experts model activates only a fraction of itself per answer. That is how something nominally enormous can be comparatively economical to run — the same point as DeepSeek V3 last December.

But « comparatively economical » is relative to other very large models, not to what fits under a desk. This is a data-centre proposition. The March position stands: for most Swiss SMEs, a hosted service under contract remains the right answer, and the self-hosting conversation belongs to firms with absolute confidentiality constraints.

What is genuinely new

Open-weight models are now being built explicitly for acting rather than answering. Until this year, the open alternatives were good at text and weak at the multi-step tool use that makes agents work.

That gap closing matters for one reason: it means the agent capability arriving in your business software this year is not structurally tied to a small number of suppliers. Whatever your vendor builds on, there will be an alternative underneath it.

The buyer’s reading, unchanged

You will not download this. Your software vendor might, and that is the relevant channel — the 11 March post on agent toolkits described exactly this mechanism.

What does not change: an agent that acts still needs the December rule. Prepare anything, complete nothing irreversible without a person. A model being open-weight, cheap or impressive at tool use says nothing about whether it should be allowed to send an email on your behalf.

The capability keeps getting better and more available. The question of what it may do in your company is still yours to answer, and still the only part nobody else can answer for you.