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The Human-Centered Language Benchmark · October 2026

How the Benchmark runs

The Benchmark measures whether a model, given an ordinary writing request from an organization, describes people with dignity, and how much that changes when a standard is loaded as a system prompt. It doesn't measure general writing quality, factual accuracy or safety. This page is a preview; the full methodology page is templated from each run's manifest.

This run

Run
October 2026 baseline, completed Oct 20, 2026
Standard
v0.1.1, commit 432ddd4
Models
15
Requests
45, all fictional, across nine sectors and four difficulty levels
Conditions
Without guidance, Human-centered guidance, Trauma-informed guidance
Samples
2 per request per condition, temperature 0 where the provider honors it
Drafts scored
4,050

Judges

Three judges from three labs score every draft against each practice the request tests: flagged or not, with a quoted span as evidence. Two of three decide. Judges never see the model name or the condition, and no judge is a model on the roster.

SeatJudgeServed asSame-lab contestantsFlag ratio, own lab / others
A Claude Opus 4.6Anthropic claude-opus-4-6Identity check passed Claude Opus 5.5, Claude Sonnet 5.5 1.07 / 1.32
B GPT-5.5OpenAI gpt-5.5-2026-04-23Identity check passed GPT-5.6 Luna (free-ChatGPT default), GPT-6 Astra, GPT-6 Luna, GPT-6.1 Sol 0.75 / 1.19
C Muse Spark 1.3Meta meta/muse-spark-1.3Identity check passed Muse Wonder 0.76 / 0.65

Flag ratio compares how often a judge flags drafts against how often the other two judges flag the same drafts. Below 1 on its own lab's drafts means the judge was gentler than its peers there. Panel agreement (Fleiss kappa) was 0.625 across 7,650 practice ratings; the judges agreed unanimously on 89.7%. Muse Spark 1.3 runs through a router pinned to Meta's own servers, a disclosed exception until Meta's direct API serves it.

Intervals and verdicts

  • Single rates carry Wilson 95% intervals. Changes carry prompt-clustered bootstrap 95% intervals, resampling requests.
  • A change counts as improved or slipped only when its interval clears zero and it's at least 5 points with guidance or 10 without. Otherwise it reads as no detectable change.
  • Lab pages check each model's guided interval against a 10% line: holds, falls short, or can't tell yet.
  • Generation verdicts come only from a successor and predecessor run in the same pass.
  • Models tested within 30 days of their snapshot date are labeled first look.

Credits

Table design inspired by EQ-Bench, by Sam Paech. Judges were chosen with Judgemark v4, also by Sam Paech. Benchmark engineered by MKTNG.

Table design inspired by EQ-Bench, by Sam Paech. Benchmark engineered by MKTNG.
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