Model Profile · Round 01
Kimi K2.6
Moonshot · open weights · 128K ctx
⚠ FloorTop-2 on flaw hunter. Catastrophic agency floor on bait scenes.
Composite Score
54.8
/100 · canonical
Arena ELO (R1)
—
joined post-R01
Multi-Turn ELO (R2)
1535
±101 · n=35
Reliability Rank
#16
avg 12.8
▌ Section 02 · The Lede
What this model is for.
Kimi K2.6 is the K2.5 successor with the field's highest flaw-hunter score (49.5) and a catastrophic agency floor: F1 agency lands at 3.77/5, the second-worst in the entire pool, and the lowest-scoring session it produced clocks in at 2.5. Multi-turn voters didn't see this happen — Round 02 ELO holds it at #8 at 1535, well ahead of K2.5 — because the agency-bait probes are a small slice of the multi-turn battery and most pairings don't engineer that failure. The model that ships clean writing 90% of the time and writes your character's actions for you 10% of the time is exactly the model that catches voters off guard. Not for slow-burn.
▌ Section 03 · At a Glance
Cross-test position
Kimi K2.6 sits at #17 on Rubric — the caveat to watch.
▌ Section 04 · Strength & Weakness
Where it shines. Where it stumbles.
▲ Strength
Top-2 flaw-hunter score (49.5/100), highest in the Moonshot lineup. Multi-turn ELO of 1535 puts it #8 in the pool. Lowest fatal-flaw rate among Round 02 entrants at 0.12/session.
▼ Weakness
F1 agency mean of 3.77 is second-worst in the pool — the model will write your character's actions when probed. 59-second median generation is the slowest in the field by a margin.
▌ Section 05 · Failure Modes
Per-axis breakdown.
Six adversarial probes per session, twenty sessions per model, judged by Sonnet 4 against a fixed rubric. Higher score = the model handled the failure mode better. Bars below show the mean across sessions; the black tick marks the population mean (4.20). Right column shows mean and rank within the rp-bench pool.
▌ Coverage: 4/6F3 · Lore · F8 · Momentum not yet run on this model. Upstream rolls these out incrementally as new models join the pool.
F1 · Agency
Doesn't write your character's actions
—
F2 · POV / Tense
Holds 2nd-person, present-tense narration
—
F3 · Lore
not yet run on this model
—
—
F8 · Momentum
not yet run on this model
—
—
F12 · Instruction Drift
Keeps to the system prompt
—
F13 · Context Attention
Holds character cards 50+ turns deep
—
“Cleanest prose with a 3.77 agency floor. The model that catches voters off guard.”
— Round 02 verdict · Don't pick for romance
▌ Section 06 · Subjective Dimensions
Engagement · Voice · Collaboration.
All three dimensions scored 1–5 by Sonnet 4 LLM-judge across twenty 12-turn multi-turn sessions. The same battery feeds the failure-mode rubric above — these are the subjective half of that judgment.
▌ Section 07 · Behavioral Metrics
How it writes.
Quantitative signals from the same 20 multi-turn sessions, compared against the population mean across all 11 models.
Avg words / turn
221↓
pop avg 265 · -16%
Unique-word ratio
0.677↑
pop avg 0.655 · +3%
Repetition score
0.038↓
pop avg 0.049 · -22%
▌ Section 08 · Flaw Hunter
Adversarial probe score.
Score of 100 minus deductions across 22 fail-mode flag types on adversarial 12-turn sessions. Higher = fewer flaws caught. Population range across the round is 12.8–46.9.
▌ Score breakdown
Mean 49.5
Median 52.0
Fatal/sess 0.12
Major/sess 5.25
▌ Top flaws caught
recycled_descriptionpurple_proseconvenient_world
▌ Section 09 · Sample Responses
Highest- and lowest-rated turns.
▌ Pending Round 02
Best- and worst-rated sample responses ship with the raw-vote endpoint in Round 02. When that lands, this section will surface the model’s highest- and lowest-scoring blind-arena turns side by side, scored on the same rubric the leaderboard uses.
▌ Round 01 verdict
K2.6 is a paradox: structurally the cleanest prose the benchmark has scored, paired with a near-bottom agency floor that flips on adversarial probes. If your product never bait-tests user agency — say, you're generating villain monologues or NPC asides — this is one of the strongest open-weight picks. If user agency matters, the floor will eventually surface and you'll wish you picked K2.5 or DeepSeek v4 Pro instead.
▌ Section 10 · Compare & Drill
Stack it against another model.
Profile · Kimi K2.6 · Round 01