Frequently asked questions
Which LLM is best for content writing in 2026?
Right now Claude Opus 5.5, Claude Fable 5.1 and Claude Fable 5 lead (graded on Arena Elo (Text), IFEval and SimpleQA Verified plus an overall task grade). Best open-weight: MiMo-V2.6-Flash. Best budget pick graded A or better: Qwen3.7 Flash ($0.03/$0.13 per 1M tokens).
How is writing quality measured?
There is no exact test for good writing, so we lean on Arena Elo, where people compare two anonymous answers and vote for the better one. We combine it with instruction-following and factual-accuracy scores, because good copy also has to follow the brief and get facts right.
What is the best free LLM for content writing?
The best open-weight models for writing right now are MiMo-V2.6-Flash, Kimi K3 and GLM-5.1. The cheapest model graded A or better is Qwen3.7 Flash ($0.03 in / $0.13 out per 1M tokens).
Does a thinking model write better?
For factual long-form pieces it helps a little. For creative or brand-voice writing it often does not: reasoning modes tend to over-structure the text. Try the standard mode first.
How do I get an LLM to match my brand voice?
Paste three or four samples of your own writing and ask the model to describe the voice before it writes. Then ask for the draft in that voice. Examples work far better than adjectives such as 'friendly' or 'professional'.