Produce fluent, on-topic text indistinguishable from a competent writer.
Sustain authorial voice and coherent argument across book-length work.
Most short- and medium-form writing — emails, essays, code documentation.
Long-form structural coherence; losing thread across tens of thousands of tokens.
| Technology | Quality | Source | Score vs. baseline | Score |
|---|---|---|---|---|
| Claude Opus 4.7 | independent | lmarena.ai | 102% | |
| Claude Sonnet 4.6 | independent | lmarena.ai | 98% | |
| GPT-5.5 | independent | lmarena.ai | 104% |