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Best AI models for long-form writing

Models that hold tone across thousands of words and refactor cleanly on edit notes.

For sustained prose, voice consistency matters more than raw benchmark scores. Pick a model your editors trust on a draft of 2,000+ words; smaller models drift in tone after the first thousand.

Switchy's picks

  1. 1
    Anthropic: Claude Sonnet 4.5

    Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...

    anthropic1000K context$3.00/Mtok in
  2. 2
    Anthropic: Claude Opus 4.5

    Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use. It offers strong multimodal capabilities, competitive performance across real-world coding and...

    anthropic200K context$5.00/Mtok in
  3. 3
    OpenAI: GPT-4.1

    GPT-4.1 is a flagship large language model optimized for advanced instruction following, real-world software engineering, and long-context reasoning. It supports a 1 million token context window and outperforms GPT-4o and...

    openai1048K context$2.00/Mtok in

Other llm models

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