Model Comparison
Kimi K3.1 Pro vs Grok 4.7
Kimi K3.1 Pro (max) leads Grok 4.7 (medium) by 301 Elo, and their 95% ranges sit 204 Elo apart. Among 83 models, each ranked by its best configuration, Kimi K3.1 Pro is #7 and Grok 4.7 is #25. Cost per script: $0.251 for Kimi K3.1 Pro (max) and $0.215 for Grok 4.7 (medium).
Last updated , from board data generated at 22:06 UTC.
Picks and Verdict
PickKimi K3.1 Pro
Kimi K3.1 Pro (max)
Pick Kimi K3.1 Pro (max) for any script, 301 Elo above Grok's best with separate ranges, at $0.251 a script.
PickGrok 4.7
Grok 4.7 (medium)
Pick Grok 4.7 (medium) only if you already run xAI models, since it's Grok's best setting, costs less than its high one and edges Kimi on tone, at $0.215 a script.
Kimi K3.1 Pro wins this match-up on almost every line. Kimi K3.1 Pro (max) sits 301 Elo above Grok 4.7 (medium), Grok's best setting, with 95% ranges 204 Elo apart. Kimi is the #7 model of 83 and Grok 4.7 the #25 model, each ranked by its best setting. Kimi ranks above all three Grok settings and wins nine of the ten scripts against medium. The biggest gap is length, 95.4 for Kimi against 78.7 for Grok, then visual cues by 6.1 points and writing craft by 5.9. Grok's drafts also swing much more, a spread of 3.00 against 1.65. Grok leads only on tone and YouTube best practices, by 1.4 and 0.8. More thinking doesn't fix it. Grok 4.7 (high) uses 42,549 reasoning tokens, more than twice Kimi's 19,487, costs $0.305 and rates 24 Elo below medium. Low to high adds 65 Elo for about 4.8 times the price. Kimi at $0.251 costs a bit more than Grok at medium, $0.215, and takes 5.5 minutes against 6.2. I don't see a case for Grok 4.7 here unless you're already locked into xAI.
How to Read the Writing Score, Writing Elo and 95% Ranges
Writing Score and Writing Elo. The Writing Score (0 to 100) is the weighted average of the nine metric scores: seven from the judges, Length Adherence from code and the Slop Score half from each. The Writing Elo is a rating from pairwise comparisons: on each script, each configuration's average across its drafts is compared with every other configuration's, and gaps within the draft-to-draft variation count as draws. Elo rewards winning often, so the two can put configurations in a different order.
Elo ranges. Each 95% range shows how far a configuration's Elo could move if the drafts had come out slightly differently. It comes from resampling every configuration's recorded draft scores on each reference script and ranking again. Comparing two separate ranges does not test the Elo gap between them: ranges far apart are strong evidence for the order, and overlapping ranges do not mean a tie. The reference scripts stay fixed, so the ranges say nothing about new scripts. The methodology page has the full description.
All Thinking Levels of Both Models
Every ranked configuration of Kimi K3.1 Pro and Grok 4.7, scored on the same 10 scripts by the same four judges.
- Each row is one configuration: the model at one thinking level. The dot is its Writing Elo, a rating from pairwise comparisons of the scores on each script, and the bar is its 95% range: how far that Elo could move if the drafts had come out slightly differently.
- When two bars overlap, the board cannot order those two configurations. Bars far apart are strong evidence for the order.
- The table under the chart lists the same configurations in the same order and adds the Writing Score (the 0 to 100 consensus of the judges and code), cost, time and configuration rank (the place among all configurations on the board).
Shaded rows are the configurations chosen for the metric comparison below.
| Configuration | Writing Elo | 95% Range | Writing Score | Cost / Script | Time / Script | Reasoning Tokens | Configuration Rank |
|---|---|---|---|---|---|---|---|
| Kimi K3.1 Pro (max) | 2205 | 2166 to 2246 | 82.5 | $0.251 | 5.5 min | 19,487 | #14 |
| Grok 4.7 (medium) | 1904 | 1855 to 1962 | 79.6 | $0.215 | 6.2 min | 27,687 | #46 |
| Grok 4.7 (high) | 1880 | 1838 to 1918 | 79.6 | $0.305 | 9.6 min | 42,549 | #47 |
| Grok 4.7 (low) | 1815 | 1769 to 1866 | 79.0 | $0.064 | 1.7 min | 2,760 | #52 |
Cost is one script at the API list price of the route used, uncached and without judging. Time is the average for one accepted script, retries included.
Computed Findings Across Thinking Levels
Each finding is computed from the configurations above. Where two 95% ranges overlap, the board cannot order those two configurations.
- Best Configurations Head to Head. Kimi K3.1 Pro (max) leads Grok 4.7 (medium) by 301 Elo, and their 95% ranges do not overlap (2166 to 2246 against 1855 to 1962), which is strong evidence for that order.
- Every Kimi K3.1 Pro Configuration Ranks Higher. Kimi K3.1 Pro (max), the only Kimi K3.1 Pro configuration on the board, ranks above all three Grok 4.7 configurations, including Grok 4.7 (medium) at Elo 1904.
- Lowest to Highest Thinking Level. Grok 4.7 moves +65 Elo from low to high, at about 4.8 times the cost per script.
Two Chosen Configurations Compared
Pick one configuration of each model to compare their metric scores, consistency across drafts and per-script scores. Each menu starts on the model's best configuration.
Scores by Metric
Kimi K3.1 Pro (max) scores higher on seven of the nine metrics and Grok 4.7 (medium) on two. Weighted by each metric's share of the Writing Score, Length Adherence does the most to put Kimi K3.1 Pro (max) ahead, with a 16.7-point lead on that metric. The weight beside each metric is its share of the Writing Score.
Consistency Across Drafts
| Kimi K3.1 Pro (max) | Grok 4.7 (medium) | |
|---|---|---|
| Score spread across drafts (±) | 1.65 | 3.00 |
| Lowest script score | 80.4 Script 7 | 75.6 Script 10 |
| Highest script score | 85.5 Script 9 | 82.2 Script 2 |
| Range across scripts | 5.1 | 6.6 |
Spread is how much the Writing Score moves between a configuration's drafts, and lower is steadier. Green marks the better number in each row.
Scores by Script
Writing Score on each reference script. Gap is Kimi K3.1 Pro (max) minus Grok 4.7 (medium), and the higher score is in bold.
| Script | Kimi K3.1 Pro (max) | Grok 4.7 (medium) | Gap |
|---|---|---|---|
| Script 1 opinion / warning explainer | 81.3 | 81.5 | -0.2 |
| Script 2 news-analysis / skeptical explainer | 83.2 | 82.2 | +1.0 |
| Script 3 personal roadmap / opinion | 81.9 | 81.6 | +0.3 |
| Script 4 short explainer | 82.0 | 76.9 | +5.1 |
| Script 5 news-analysis / opinion explainer | 84.2 | 80.5 | +3.7 |
| Script 6 founder announcement / personal origin story | 83.0 | 82.0 | +1.0 |
| Script 7 personal technical walkthrough / agentic workflow case study | 80.4 | 76.5 | +3.9 |
| Script 8 product release announcement / personal observation | 82.1 | 79.0 | +3.1 |
| Script 9 career guide / hiring analysis | 85.5 | 80.2 | +5.3 |
| Script 10 engineering process walkthrough / presentation adaptation | 81.3 | 75.6 | +5.7 |
Scorecards and Thinking Pages
Each configuration name in the table above opens its own scorecard.
Compare With Another Model
Pick a second model. A pair with its own written match-up opens that page, and any other pair opens in the comparison tool.
Nearby Match-Ups by Best Writing Elo
Every configuration wrote five drafts for each of the same 10 briefs, from the same prompt. Generation was closed-book, with the prompt as the only source and no web search or other tools. Each judge scores every draft once: Claude Opus 5.5 at medium effort through the Claude Code subscription, GPT-6.1 Sol at medium reasoning through the Codex CLI, GLM 5.3 Flash through OpenRouter, and Jev 1.13, a typed judge from TypeSafe that answers each metric as a multiple-choice question. The channel's finished script is their reference for the voice, and it gets no score on the board itself.
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