The cost of a frontier open model just became public record. xiaomi opened the weights of mimo v2.6…
the cost of a frontier open model just became public record. xiaomi opened the weights of mimo v2.6 on september 22 and published the reinforcement learning receipt: 6 days, 30 steps, about 750,000 trajectories, and 2.62 million dollars for the pro model.
training transparency is the new benchmark.
Context
Verified source: Xiaomi's MiMo page and AI.info (Sep 22, 2026) say Xiaomi released MiMo-V2.6 Pro and Flash weights with RL code and a technical report. Xiaomi says both models completed 30 steps in under 6 days, with about 750,000 trajectories in total. The arXiv report says RL post-training cost 2.6 million dollars for Pro and 0.9 million for Flash.
The Sep 22 release, 6 days, 30 steps and about 750,000 trajectories match Xiaomi. The 2.62 million dollar figure for Pro is AI.info's number and the arXiv report rounds it to 2.6 million. 'Training transparency is the new benchmark' is the author's opinion.
Watch next
- Read the technical report for what the cost figure includes.
Sources
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 24 September 2026 at 11:02 IST. Sources are the papers and datasets the note draws on.
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