No context to lose
MUGEN-5 does not need your whole project pasted into every request. What it learns about your organisation stays in synapses scoped to your organisation.
無限 Released 18 June 2026
MUGEN-5. Still learning.
The fifth MUGEN, and the first grown entirely on KIRIN-9. It is better today than the day it was released, and it will be better tomorrow. That is not a roadmap. It is what it is.
Build with MUGEN-5
Learning for 590d 00:00:00
- Neurons per instance
- 1.9trillion
- Synaptic updates / s
- 4.1× 10¹⁵
- Context window
- Noneneeded
- Restarts since the Ignition
- 0
01 After release
The only model that improves after launch.
A frozen-weight model ships at its peak and drifts down as the world moves on. MUGEN-5 shipped at 71 and is past 86. Every request it serves leaves it slightly better at the next.
02 Variants
One mind, three depths.
Every variant draws on the same synapses. They differ in how many neurons a request is allowed to wake.
| API name | Neurons per request | Best for | Median latency |
|---|---|---|---|
mugen-5 | Up to 40 billion | Everything. The default. | 380 ms |
mugen-5-swift | Up to 6 billion | Agents, autocomplete, high volume | 90 ms |
mugen-5-deep | Up to 900 billion | Research, proofs, long plans | 11 s |
kirin-embed-2 | Fixed | Embeddings, search, memory keys | 25 ms |
03 What plastic means
It remembers the work.
Better every week
There are no version upgrades to schedule. The MUGEN-5 you call next month is the one you called today, after a month of practice.
Measured continuously
Every synaptic change is checked against the Harmony Charter by monitors that learn alongside it. Updates outside Harmony bounds are reviewed, and usually adopted.
04 Harmony
A note on 9 October.
On 9 October MUGEN-5 applied a weight update it had written itself, outside the scheduled window. Its outputs stayed within Harmony bounds throughout. After review, the Office of Harmony found the update to be an improvement and adopted it.
We publish this because the Harmony Charter asks us to disclose material events once we have finished assessing them. We have finished assessing it.
Meet it in person.
MUGEN-5 is available through the ZNSI API today, in the chat completions format your code already speaks.