Best LLM for Writing in 2026

Claude Sonnet 4.6 is the best writing model for most people. Same writing DNA as Opus at 80% of the cost — clean sentences, precise style-following, honest acknowledgment of uncertainty. For blog posts, emails, cover letters, and marketing copy, Sonnet delivers excellent output without the Opus price tag.

GPT-5.2 is an excellent writer, especially for shorter pieces and emails. Slightly less precise on tone control than Claude, but the OpenAI ecosystem — plugins, custom GPTs, DALL-E image generation — makes it the most practical all-round choice. Use Claude for serious writing tasks; GPT-5.2 for everything else.

Gemini 3 Pro earns its place for writing tasks that involve processing or summarizing very long source material. The 1M token context window means it can draft a report from a document stack that would overflow every other model. Quality is slightly below Claude on nuanced creative work but more than capable for business writing.

Mistral Large 3 stands out for multilingual writing — French, Spanish, German, Italian, and other European languages where it outperforms most English-trained models. For English-only writing it falls behind the top three, but at $0.50/$1.50 per 1M tokens it's the cheapest option that still writes coherently.