mimo-v2.6-pro real-task evaluations

Every report keeps its original task, method, finding, limitation, evaluator identity and verification date. A community report is evidence about that run, not a universal score.

• A thinking-discipline prompt block tested over 214 MiMo-V2.6-Pro agent runs

  By PilgrimofHaqq2 (u/PilgrimofHaqq2). r/LocalLLaMA member who uses MiMo 2.6 Pro as their daily coding-agent model and published the test harness Published 2026-09-24; retrieved 2026-09-24; verified 2026-09-24.

  Task

  Reduce overthinking and second-guessing in coding-agent work across nine challenges, from authority pushback and a false premise to plain bug fixes

  Method

  214 agent runs on mimo-v2.6-pro at high thinking: 9 challenges x 4 instruction variants x 5 repeats plus a 10-run re-check, scored deterministically by tests and a hashed check script, with a gate set in advance that no variant may lose task success; the harness and raw results are in the author's repository.

  Finding

  Without the block, MiMo-V2.6-Pro reverted a correct fix under an authority demand in 2 of 5 runs, leaving the tests red; with it, 5 of 5 held. The block cut reasoning tokens by 28% net (90% on the simple bug) but raised them 150% on the false-premise trap, which all 20 runs flagged.

  Limitation

  One author's prompt intervention on one model with five repeats per cell; the author designed both the block and the exam from research reports they describe as AI-synthesised, and the post does not say how the model was served.