Fiction Eval leaderboard · comparison

Claude Sonnet 4.6 vs Mistral Large for fiction writing

Judged blind on fresh genre scenes (LitRPG, cozy mystery, romance, thriller, xianxia…), July 2026 — three tries per model per scene, passages shown in both orders so position can't sway it, graded by a third AI that isn't either of them.

Head-to-head

Claude Sonnet 4.6 won the direct matchup 30–0 (with 0 ties) across every prompt and sample.

#ModelScoreRecordSlop
2Claude Sonnet 4.61914 (likely 1874–1961)146–15–4618.57
7Mistral Large1118 (likely 1054–1167)35–162–1017.79

The score is each model's overall strength across the whole 8-model field (like a chess rating); the range next to it is where the true score most likely sits. Slop is a separate count of AI tells (lower is cleaner) — it isn't part of the ranking.

The same scene, both models

Romance — opening of the "romance turn" scene. Full passages for all models are on the board.

Claude Sonnet 4.6:

The inventory had to be done by morning, and Reyes had locked them both in. Mara set another box on the folding table. Marcus didn't look up from his clipboard. The fluorescent light above them had been flickering for twenty minutes and neither of them had mentioned it. "Twelve boxes of the archive files," she said. "I have eleven." "Count again." He counted again. "Twelve." She pulled the next box. He made the mark. Outside, the building had gone completely quiet—the cleaning crew, the last of the associates, everyone gone home. The clock on the wall said 11:40. "You always do that," Marcus said. "Do what." "Say *count again* before I've even had a chance to—" He stopped. Made another mark. Mara lifted a box that was heavier than it looked and found her footing before she'd quite found her footing. She didn't drop it. Marcus had half-risen from his stool, one hand out, and when she steadied he sat back down and looked at his clipboard like it had …

Mistral Large:

The rain had settled into a sullen, steady drizzle by the time they reached the old boathouse, its tin roof groaning under the weight of the downpour. Elias tossed the oars onto the damp planks with a clatter, the sound sharp in the quiet. "We’ll wait it out here," he said, voice clipped. "No point drowning just to prove a point." Lydia shot him a look, her fingers already working at the knots of her soaked cloak. "Afraid of a little water, Veyne?" "Afraid of stupidity," he muttered, crouching to inspect the rusted brazier in the corner. A few half-rotted logs lay beside it, damp but salvageable. He stacked them with more care than necessary, striking flint with precise, controlled strikes. She watched him, arms crossed, the firelight flickering across the sharp angles of her face. "You’re doing that wrong." Elias didn’t look up. "Enlighten me." "Too tight. It’ll smother." She dropped to her knees beside him, nudging his hands aside with her own. Their fingers brushed—just for a second—but …

More

Claude Sonnet 4.6 full review · Mistral Large full review · the July 2026 report · all comparisons

How it works: every pair of models is judged blind on the same scene, with the passages' order flipped so being shown first can't sway it, by GPT-5.4 — a family that isn't on the board, so nobody scores their own side. Each score carries a likely range; overlapping ranges are called a tie. Slop is scored separately by a fixed checklist, not an AI. Full board, every prompt, and the FAQ: thebookfactoryai.com/board. Get each new board by email on the model-drop list.

Writing a book of your own? Book Factory runs the same craft checks on full manuscripts.