ai MiMo-V2.6-Pro UltraSpeed
Other · proprietary · writing benchmark
The short version
MiMo-V2.6-Pro UltraSpeed sits at #24 of 167 on ToneBench, in the middle of the pack, with a writing Elo of 2197 and an overall score of 88.3 out of 100. We measured it by having it write all 10 of our real YouTube scripts, five times each, then scoring every draft blind against our own finished versions. Here is how it shook out.
Inside Other, this is the strongest writer we tested. It edges out the other 8 Other configs on the board, so if you're staying in this family for voice work, this is the one to reach for.
Among proprietary models, it comes in 21st of 114. That ranking is against the stronger half of the board: closed models still set the pace on voice fidelity here.
What it does best is Writing Craft: it ranks 17th on that dimension at 89.4, well above the board average. Its softer spot is Length Discipline (86.1, 50th), which is the thing to watch if that metric matters most for your use.
It was uneven across the 10 scripts. Its best run was the personal technical walkthrough / agentic workflow case study (90.1) and its weakest was the engineering process walkthrough / presentation adaptation (87.0), a spread of about 3 points. Worth knowing if your writing skews toward one of those formats.
On cost, it runs about $0.122/task. GLM-5.3 Flash scores higher for less money, at $0.007/task, so on pure value this config is not the frontier. Still, it beats 14 models that cost noticeably more.
Skill profile
The shape is the story: the further a corner reaches, the stronger that dimension. Biggest edge over the board: Length Discipline (+15.3); smallest edge: Hook (+7.0).
Per-metric scores
Nine writing dimensions, each scored 0–100 and blended by the editorial weight shown. Rank is against all 167 current-ranked models. The thick bar is this model; the thin lines above and below are the current field's best model (darker) and average (lighter) on the same scale. The small ± number is its run-to-run variation.
Per-article scores
The same 10 real scripts every current-ranked model writes, scored individually. Different formats stress different skills.
Consistency: run-to-run variability
Every cell on this page is the mean of 5 independent runs per script; the ± numbers are the run-to-run standard deviation. Overall, MiMo-V2.6-Pro UltraSpeed varies by ± 1.6 points between runs versus a board median of ± 2.7, so it is noticeably steadier than the typical model here.
Its steadiest is Hook (± 1.1 vs ± 2.0 board median), which you can rely on run after run.
| Metric | This model | Board median | Verdict |
|---|---|---|---|
| Tone & Voice ? | 88.4 ± 1.6 | ± 1.7 | typical |
| Writing Craft ? | 89.4 ± 1.2 | ± 1.5 | typical |
| Substance & Value ? | 88.2 ± 1.6 | ± 2.0 | typical |
| Flow & Emotion ? | 87.8 ± 1.7 | ± 1.8 | typical |
| YouTube Structure ? | 88.2 ± 1.9 | ± 2.9 | typical |
| Hook ? | 88.5 ± 1.1 | ± 2.0 | steadier than most |
| Length Discipline ? | 86.1 ± 9.3 | ± 8.6 | typical |
| Anti-Slop ? | 92.0 ± 1.3 | ± 2.1 | typical |
| Visual Cues ? | 85.7 ± 1.9 | ± 3.2 | typical |
Measured, not modeled
Numbers we log on every run and rarely talk about. None of these affect the writing scores; cost and latency are informational.
What each judge scored it
The published overall of 88.3 is the consensus of three family-disjoint judges scoring the same 50 stored drafts blind with the identical rubric. The highest and lowest judge differ by 3.4 points on its overall. The three judges essentially agree on this model. How the panel works: methodology.
How we ran MiMo-V2.6-Pro UltraSpeed
- Accessed viaOpenRouter · model page ↗
- Exact model / route id
xiaomi/mimo-v2.6-pro-ultraspeed(provider default reasoning) - Generations5 independent runs × 10 scripts = 50 drafts, stored immutably after generation
- Run dates2026-09-25
- Judges3-judge panel: Claude Opus 5, high effort (Anthropic) + DeepSeek V4.1 Flash (OpenRouter) + GPT-5.6 Sol, medium reasoning (Codex CLI): every draft scored independently by all three with the identical rubric, blind to model identity, evidence quotes required before each metric score; published score = per-metric consensus mean, verified with a Bradley-Terry refit (methodology)
- Samplingprovider-default sampling, no fine-tuning, no system-prompt changes; every current-ranked model gets the identical brief, style contract and research packet
- What stays privatethe exact rubric and any non-public reference material; source-publication timing is disclosed for exceptions (why)
Frequently asked questions
How good is MiMo-V2.6-Pro UltraSpeed at writing?
On ToneBench it ranks #24 of 167 with a writing Elo of 2197 and an overall score of 88.3/100. That score comes from writing our 10 real YouTube scripts five times each and scoring every draft blind against our own finished versions across nine writing dimensions.
Is MiMo-V2.6-Pro UltraSpeed the best Other model for writing?
Yes. Among the Other configs we tested, MiMo-V2.6-Pro UltraSpeed is the strongest writer on the board.
Is MiMo-V2.6-Pro UltraSpeed good value for the money?
It costs about $0.122/task. GLM-5.3 Flash scores higher for less, so it is not the value pick.
What are MiMo-V2.6-Pro UltraSpeed's strengths and weaknesses?
Its strongest dimension is Writing Craft (17th on the board, 89.4). Its weakest is Length Discipline (50th on the board, 86.1). The full nine-metric breakdown is on this page.
Does MiMo-V2.6-Pro UltraSpeed write some formats better than others?
Yes. Its best of our 10 scripts was the personal technical walkthrough / agentic workflow case study (90.1) and its weakest was the engineering process walkthrough / presentation adaptation (87.0).
How consistent is MiMo-V2.6-Pro UltraSpeed between runs?
We run every script 5 times. MiMo-V2.6-Pro UltraSpeed's overall score varies by about ±1.6 points between runs, versus a board median of ±2.7. That makes it one of the steadier models we test. The full per-metric variability table is on this page.
How was MiMo-V2.6-Pro UltraSpeed evaluated?
Via OpenRouter using the exact model/route id xiaomi/mimo-v2.6-pro-ultraspeed, run on 2026-09-25. 5 runs per script, provider-default sampling, no fine-tuning; every draft scored blind with a fixed rubric by a three-family judge panel. Full details in the 'How we ran it' section and the methodology.
Is MiMo-V2.6-Pro UltraSpeed open source?
No, it is a proprietary (closed-weights) model. Among proprietary models it ranks 21st of 114 for writing.