Grok 4.6 vs Kimi K3 256K
Grok 4.6 was superseded by Grok 4.7. The grades below are the last ones measured, so read them as history rather than as this week's board. See the current roster.
Grok 4.6 leads overall, C- to D+. The two cost about the same per task. By suite, Kimi K3 256K takes real-world issues (C- to D) and Grok 4.6 takes spec planning (C to C-). Take Kimi K3 256K anyway when you want the side that is faster on real-world issues and ahead on real-world issues.Measured
Each agent graded on the same private suites, running headless through its own tools. Advantages are oriented so a win is a win, whichever way the metric runs.
Verdict: Kimi K3 256K vs Grok 4.6
Grok 4.6 leads overall, C- to D+. By suite: Kimi K3 256K takes real-world issues, C- to D (60% vs 47% capability); Grok 4.6 takes spec planning, C to C- (66% vs 56% capability); Grok 4.6 takes vibe coding, C- to F (61% vs 34% capability). Grok 4.6 used 13% of SuperGrok Plus's weekly limit per pass, $0.157 per task at the listed price. Kimi K3 256K used 31% of Kimi Allegretto's weekly limit per pass, $0.146 per task at the listed price. Per task the two cost about the same ($0.157 vs $0.146). Kimi K3 256K is faster on real-world issues: a median task takes 3m 31s against 7m 10s. Both finished every task on it. Reasons to pick Kimi K3 256K anyway: it is faster on real-world issues (3m 31s vs 7m 10s median) and it leads on real-world issues (C- to D).
Changed since the previous graded week: Grok 4.6: real-world issues C- to D, real-world issues usage 4% to 3% of the weekly limit, vibe coding C+ to C-; Kimi K3 256K: real-world issues usage 23% to 21% of the weekly limit, spec planning D+ to C-, spec planning usage 11% to 10% of the weekly limit, vibe coding usage 3% to 2.6% of the weekly limit.
| Dimension | Grok 4.6 | Kimi K3 256K | Advantage |
|---|---|---|---|
| Capability | 47% | 60% | +13% (Kimi K3 256K leads) |
| Median task time | 7m 10s | 3m 31s | 3m 39s faster (Kimi K3 256K leads) |
| Approx. task cost | $0.046 / task | $0.126 / task | $0.080 / task lower (Grok 4.6 leads) |
Grok 4.6: 3.0% of SuperGrok Plus (3.0% / 1w) per run. Kimi K3 256K: 104.0% of Kimi Allegretto (104.0% / 5h, 21.0% / 1w) per run. Its weekly limit holds about 5 of the week's 33.6 5h windows. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | Grok 4.6 | Kimi K3 256K | Advantage |
|---|---|---|---|
| Capability | 66% | 56% | +10% (Grok 4.6 leads) |
| Median task time | 45m 26s | 5m 26s | 40m 0s faster (Kimi K3 256K leads) |
| Approx. task cost | $0.575 / task | $0.224 / task | $0.351 / task lower (Kimi K3 256K leads) |
Grok 4.6: 10.0% of SuperGrok Plus (10.0% / 1w) per run. Kimi K3 256K: 52.0% of Kimi Allegretto (52.0% / 5h, 10.0% / 1w) per run. Its weekly limit holds about 5 of the week's 33.6 5h windows. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | Grok 4.6 | Kimi K3 256K | Advantage |
|---|---|---|---|
| Capability | 61% | 34% | +27% (Grok 4.6 leads) |
| Median task time | 11m 14s | 7m 33s | 3m 41s faster (Kimi K3 256K leads) |
| Approx. task cost | <$0.230 / task | $0.233 / task | $0.003 / task lower (Grok 4.6 leads) |
Grok 4.6: under 1% of SuperGrok Plus per good solve. Kimi K3 256K: 13.2% of Kimi Allegretto (13.2% / 5h, 2.6% / 1w) per good solve. Its weekly limit holds about 5 of the week's 33.6 5h windows. Each figure is a share of that agent's own plan, so there is no delta to draw.
Grades and deltas are comparable only within a suite version. See methodology.
Frequently asked questions
Which is better for coding, Grok 4.6 or Kimi K3 256K?
Both clear tier 4 of 5, but Kimi K3 256K scores higher on capability: 60% versus 47% on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-09-20.
Which is cheaper per task, Grok 4.6 or Kimi K3 256K?
Grok 4.6 used 13% of SuperGrok Plus's weekly limit per pass, $0.157 per task at the listed price. Kimi K3 256K used 31% of Kimi Allegretto's weekly limit per pass, $0.146 per task at the listed price. Per task the two cost about the same ($0.157 vs $0.146).
What do Grok 4.6 and Kimi K3 256K cost a month?
Grok 4.6 runs on SuperGrok Plus at $100/month (public price as of 2026-09-14). Kimi K3 256K runs on Kimi Allegretto at $39/month (public price as of 2026-07-20).