GPT-5.4 mini
Near-flagship quality. 2x faster. Lowest cost per document.
OpenAI's compact model approaching full GPT-5.4 performance at a fraction of the cost and latency. More than 2x faster than its predecessor. The best cost-to-quality ratio for high-volume, fast-turnaround writing. Not suited for complex multi-document reasoning but excellent for day-to-day drafts.
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 GPT-5.4 mini?
Jump into the Studio and start writing. Plans from £10/month.
Choose a PlanFast, affordable AI writing for everyday tasks.
GPT-5.4 mini is the most cost-effective writing model on Stensyl. It costs less than any other model while delivering quality that approaches the full GPT-5.4. For the everyday writing tasks that fill a design professional's week, this is the model that makes AI drafting practical at volume.
Speed is the other advantage. GPT-5.4 mini is more than 2x faster than its predecessor, delivering drafts in seconds. When you need a quick project summary before a call, an email draft between meetings, or social captions for a portfolio post, waiting 30 seconds for a premium model is unnecessary. Mini delivers in the time it takes to switch tabs.
The trade-off is reasoning depth. GPT-5.4 mini is not the right choice for complex multi-document reasoning, detailed technical specifications, or documents that require extensive cross-referencing. For those tasks, step up to GPT-5.4, Sonnet, or Opus. But for the 70% of writing tasks that are straightforward, mini is the smartest use of your plan.
Volume writing at scale
A Lite plan's 1,000 monthly credits stretches across plenty of drafts with mini. Project summaries, email drafts, social captions, product listings, and meeting notes add up fast. Mini makes it economical to use AI for all of them, not just the important ones.
Speed for real workflows
2x faster means documents arrive before you have time to context-switch. Draft a client email while the thought is fresh. Generate meeting notes while the discussion is still in your head. Speed is not a luxury feature. It is the difference between using AI and forgetting to.
When to step up
If the document needs to reference multiple source materials, maintain consistency across 5+ pages, or follow complex formatting requirements, use a larger model. Mini is excellent at single-task, well-prompted writing. It is not built for the kind of multi-step reasoning that planning statements or technical specifications demand.
Questions about GPT-5.4 mini.
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 GPT-5.4 mini?
Professional document drafting. Plans from £10/month.