Content
Long-Form Writing
Generating multi-thousand-word documents with consistent voice and internal coherence.
Recommended agents
AnthropicOpenAIAnthropic
Claude Opus 4.7
Anthropic's flagship at the time of this entry: extended thinking on, 1M-token context, the most patient of the frontier models.
GPT-5
OpenAI's reasoning-first flagship. Native chain-of-thought, three reasoning-effort tiers, the highest published benchmark scores at release.
Claude Sonnet 4.6
The workhorse. Faster than Opus, smarter than Haiku, the model most production deployments end up on.
Budget pick
Claude Sonnet 4.6
$3-$15 per million tokens
Key considerations
- ›Voice consistency over length
- ›Internal cross-reference accuracy
- ›Fact verification