Model Comparison
Kimi K3 vs GLM-5.3 Flash
Too close to call: the best configurations, Kimi K3 (max) and GLM-5.3 Flash (max), are 63 Elo apart, and their 95% ranges overlap. Among 78 models, each ranked by its best configuration, Kimi K3 is #10 and GLM-5.3 Flash is #12. Cost per script: $0.362 for Kimi K3 (max) and $0.022 for GLM-5.3 Flash (max).
Last updated , from board data generated at 01:13 UTC.
Picks and Verdict
PickKimi K3
Kimi K3 (max)
Pick Kimi K3 (max) for its small leads in voice and visual cues, at $0.362 and nearly ten minutes a script.
PickGLM-5.3 Flash
GLM-5.3 Flash (max)
Pick GLM-5.3 Flash (max) for most scripts, since its range overlaps Kimi's best and it costs $0.022 a script.
GLM-5.3 Flash is where I'd start, because the board can't separate the two best settings and the prices are far apart. By best setting, Kimi K3 is the #10 model of 78 and GLM-5.3 Flash the #12 model: Kimi K3 (max) rates 63 Elo above GLM-5.3 Flash (max), and their 95% ranges overlap. Kimi leads eight of the nine metrics, none by more than two points, while GLM holds the requested length better. Then the bill: GLM costs $0.022 a script, and Kimi at max costs about 16 times that and takes almost twice as long. Kimi's cheaper setting doesn't help it. Kimi K3 (high) costs $0.128, almost six times GLM's price, and lands 162 Elo below GLM with separate ranges. So Kimi needs max to compete at all, gaining 225 Elo over high. For everyday scripts I'd run GLM, and I'd keep Kimi at max for anyone who wants its small edges in voice and visual cues and doesn't mind a wait of nearly ten minutes.
Disclosure: GLM-5.3 Flash comes from the same lab as one of the four judges, GLM 5.3 Flash. The other three sit outside its lab, so it is never scored by its own lab alone (how the panel works). The judge analysis measures how much each judge favors its own lab.
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 and GLM-5.3 Flash, 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 (max) | 2203 | 2158 to 2243 | 82.2 | $0.362 | 9.9 min | 18,568 | #20 |
| GLM-5.3 Flash (max) | 2140 | 2093 to 2186 | 81.8 | $0.022 | 5.2 min | 37,224 | #23 |
| Kimi K3 (high) | 1978 | 1936 to 2029 | 80.3 | $0.128 | 2.8 min | 3,081 | #37 |
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 (max) at Elo 2203 (range 2158 to 2243) and GLM-5.3 Flash (max) at Elo 2140 (range 2093 to 2186) have overlapping 95% ranges, so the board cannot separate the two best configurations.
- Same Level Name, Side by Side. At max, the one level name both models use, Kimi K3 has the higher Writing Elo: 2203 against 2140. Their 95% ranges overlap there. Level names come from each provider, so the same name does not promise the same reasoning budget.
- Cheapest Configuration Overlapping the Top One. GLM-5.3 Flash (max), at $0.022 per script, is the cheapest configuration whose 95% range overlaps that of Kimi K3 (max), at $0.362 per script: 2093 to 2186 against 2158 to 2243, so the board cannot separate them. Kimi K3 (max) costs about 16 times as much per script.
- Cheapest Kimi K3 Configuration Above GLM-5.3 Flash's Best. The cheapest Kimi K3 configuration with a higher Writing Elo than GLM-5.3 Flash (max), at Elo 2140 and $0.022 per script, is Kimi K3 (max), at Elo 2203 and $0.362 per script. Their 95% ranges overlap, so the board cannot separate them. It costs about 16 times as much per script.
- Lowest to Highest Thinking Level. Kimi K3 moves +225 Elo from high to max, at about 2.8 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 (max) scores higher on eight of the nine metrics and GLM-5.3 Flash (max) on one. Weighted by each metric's share of the Writing Score, Continuity & Emotion does the most to put Kimi K3 (max) ahead, with a 1.0-point lead on that metric. The weight beside each metric is its share of the Writing Score.
Consistency Across Drafts
| Kimi K3 (max) | GLM-5.3 Flash (max) | |
|---|---|---|
| Score spread across drafts (±) | 1.68 | 1.62 |
| Lowest script score | 80.0 Script 10 | 80.3 Script 4 |
| Highest script score | 83.8 Script 9 | 83.8 Script 9 |
| Range across scripts | 3.8 | 3.5 |
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 (max) minus GLM-5.3 Flash (max), and the higher score is in bold.
| Script | Kimi K3 (max) | GLM-5.3 Flash (max) | Gap |
|---|---|---|---|
| Script 1 opinion / warning explainer | 81.4 | 81.1 | +0.3 |
| Script 2 news-analysis / skeptical explainer | 82.6 | 81.5 | +1.1 |
| Script 3 personal roadmap / opinion | 81.8 | 81.0 | +0.8 |
| Script 4 short explainer | 80.1 | 80.3 | -0.2 |
| Script 5 news-analysis / opinion explainer | 83.4 | 82.1 | +1.3 |
| Script 6 founder announcement / personal origin story | 83.2 | 82.9 | +0.3 |
| Script 7 personal technical walkthrough / agentic workflow case study | 83.6 | 83.5 | +0.1 |
| Script 8 product release announcement / personal observation | 82.3 | 80.8 | +1.5 |
| Script 9 career guide / hiring analysis | 83.8 | 83.8 | 0.0 |
| Script 10 engineering process walkthrough / presentation adaptation | 80.0 | 81.2 | -1.2 |
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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