Claude Sonnet
Natural prose. Fast drafting. Best value for most writing.
Claude Sonnet 4.6 balances capability with speed. Writing tends to be more natural and less verbose than Opus. For most professional writing tasks the quality gap between Sonnet and Opus is smaller than the gap between good and bad prompts. Start here, upgrade to Opus only for massive cross-referencing tasks.
Try these prompts
How it works
Describe your brief
Type what you need: a proposal, case study, specification, or creative copy.
Choose model and document type
Pick your writing model and document length. See the credit cost before you generate.
Draft generated in seconds
Your document is drafted and ready to review, edit, copy, or export. Iterate or switch models.
Ready to draft with Claude Sonnet?
Jump into the Studio and start writing. Plans from £10/month.
Choose a PlanNatural professional writing at speed.
Claude Sonnet 4.6 is the workhorse of Stensyl's writing suite. It produces clean, natural prose that reads like it was written by a professional, not generated by a machine. Where Opus overthinks, Sonnet writes with the kind of confident brevity that busy design professionals actually need.
For client proposals, concept narratives, brief responses, and project descriptions, Sonnet delivers output that requires minimal editing. The tone is professional without being stiff, detailed without being verbose. It understands design language and speaks it fluently across all nine disciplines Stensyl serves.
The practical advantage of Sonnet is the combination of quality and speed. Documents draft in seconds, not minutes. The cost-to-quality ratio makes it viable for everyday professional use rather than reserved for special occasions.
Everyday professional writing
Sonnet is built for the documents design professionals write every week: client proposals, concept narratives, brief responses, project descriptions, social media copy, and blog content. It handles all of these with consistent quality and minimal editing required.
Less verbose, more natural
AI writing has a reputation for being wordy and generic. Sonnet trends in the opposite direction: concise, specific, and naturally phrased. It produces prose that sounds like a confident professional wrote it, not like a language model padded it.
The right starting point
For 90% of professional writing tasks, Sonnet is the right model. Start here. If you find the document needs deeper cross-referencing or you are working with 10+ pages of source material, switch to Opus. But most of the time, Sonnet will get the job done faster and cheaper.
Questions about Claude Sonnet.
Why Stensyl?
A small indie studio building creative tools the way they should be built. No VC theatre, no funnel games, no faceless support.
Ready to draft with Claude Sonnet?
Professional document drafting. Plans from £10/month.