Claude · Writing
Claude for writing
llmwise has 6 of Anthropic's Claude models, from Claude Haiku 5.5 (up to 60 messages a day on Pro) to Claude Fable 5.1 (up to 31 messages a month). We ran the same writing prompts on every one and published every reply: which Claude model to use, from the results, what each costs per message, and how to get more out of it.
Based on 30 of our test runs on , through OpenRouter with the app's own prompt and settings. Updated .
Short answer
In our test runs on October 7, 2026, Claude Sonnet 5 (4 of 5) passed the most writing prompts: our pick for hard problems. For value, Claude Haiku 4.5 (4 of 5), 250 a month on Pro; for everyday writing, Claude Haiku 5.5 (3 of 5), from the daily count.
Our picks for writing
Hard problems
Passed 4 of 5 writing prompts, both hard ones.
Best value
Passed 4 of 5 writing prompts, with 250 a month on Pro.
Everyday
Passed 3 of 5 writing prompts; an everyday model, so its messages come from the daily count (60 a day on Pro), not the monthly allowance.
These picks aren't our opinion: they're what the results below give, by these rules, among the Claude models in llmwise. They change when the results do.
- Hard problems: the model that passed the most prompts and, of those, the most hard ones. Models level on both share the pick: the prompts don't tell them apart, so we don't break the tie by price or by name.
- Best value: among the models that draw on the monthly allowance, the one with the most messages on Pro that passed no more than one prompt fewer than the top model. Ties go to the one that passed more, then to the lower cost per reply.
- Everyday: among the cheapest models on the page (the everyday models, which come from the daily count, when the page has any), the one that passed the most. Ties go to the one that passed more of the hard prompts, then to the lower cost per reply.
Our writing test runs, model by model
How each model did on our 5 writing prompts, what each reply counted as on Pro, and what it cost to run.
| Model | Passed | Hard ones | Messages used on Pro | Cost per reply | Time per reply |
|---|---|---|---|---|---|
| Claude Fable 5.1Anthropic | 3 of 5 | 0 of 2 | 1 each, of 31 a month on Pro | $0.0172 | 6.7 s |
| Claude Opus 5.5Anthropic | 4 of 5 | 1 of 2 | 1 each, of 62 a month on Pro | $0.0185 | 9.7 s |
| Claude Sonnet 5.5Anthropic | 4 of 5 | 1 of 2 | 1 each, of 125 a month on Pro | $0.0034 | 2.8 s |
| Claude Sonnet 5Anthropic | 4 of 5 | 2 of 2 | 1 each, of 125 a month on Pro | $0.0034 | 4.2 s |
| Claude Haiku 4.5Anthropic | 4 of 5 | 1 of 2 | 1 each, of 250 a month on Pro | $0.0011 | 2.4 s |
| Claude Haiku 5.5Anthropic | 3 of 5 | 1 of 2 | 1 each, of 60 a day on Pro | $0.0002 | 2.2 s |
One prompt, side by side
Each model's reply to “A product announcement with five rules”, as it came, with whether it passed and what it cost.
The prompt: A product announcement with five rules (hard)
Write a product announcement for the Nordvik 2 desk lamp in under 120 words. Include all five facts: it dims in five steps; it charges from USB-C; its arm turns 270 degrees; it costs €79; it ships on 1 December. Use no exclamation marks, and end with a question.
Claude Sonnet 5
Passed: Graded 4.3 of 5 on average (lowest 4).
**Introducing the Nordvik 2 Desk Lamp** Meet the Nordvik 2, thoughtfully redesigned for how you actually work. Five-step dimming lets you fine-tune brightness for any task, from focused reading to ambient evening light. The 270-degree rotating arm adjusts to virtually any angle, giving you precise control over where light falls. USB-C charging means one cable does it all, keeping your desk clutter-free and compatible with everything else you own. Priced at €79, the Nordvik 2 brings premium design and functionality within easy reach. It begins shipping on 1 December, just in time to brighten your winter workspace. Ready to see how the right light changes the way you work?
554 tokens in, 235 out · 4.5 s · $0.0035 · 1 message on Pro · answered by anthropic/claude-sonnet-5 via Claude Platform on AWS ·
Claude Haiku 4.5
Failed: Graded 3.7 of 5 on average (lowest 3).
# Introducing the Nordvik 2 Desk Lamp Meet the Nordvik 2, designed for modern workspaces. This versatile lamp features a 270-degree rotating arm that positions light exactly where you need it. Five-step dimming lets you adjust brightness from soft ambient to focused task lighting. Charging is effortless with USB-C connectivity, keeping your desk cable-free and clutter-free. The minimalist design complements any interior while delivering reliable performance. At just €79, the Nordvik 2 offers exceptional value for professionals and students alike. Pre-order now for delivery on 1 December. Ready to upgrade your workspace with smarter lighting?
437 tokens in, 154 out · 2.2 s · $0.0012 · 1 message on Pro · answered by anthropic/claude-haiku-4.5 via Amazon Bedrock ·
Claude Haiku 5.5
Passed: Graded 4.3 of 5 on average (lowest 4).
Introducing the Nordvik 2 desk lamp. It dims in five steps, so you can match the light to your work or your mood. Its arm turns a full 270 degrees, letting you aim light exactly where you need it. The lamp charges from USB-C, so one familiar cable keeps it ready to use. Priced at €79, the Nordvik 2 ships on 1 December. Could this be the desk lamp your workspace has been missing?
557 tokens in, 143 out · 1.5 s · $0.0001 · 1 message on Pro · answered by anthropic/claude-haiku-5.5 via Anthropic ·
The writing prompts, and how they're scored
Rubric (graded). The grader model scores the reply from 1 to 5 on each published criterion. It passes with an average of 4 or more and no criterion under 3, and only if it also meets the prompt's automatic rules (length, words it must or mustn't use).
The grader is Claude Opus 5.5 at low reasoning effort; its own replies are graded by GPT-6 Astra, so no model grades itself. Its prompt and every rubric are on the methods page.
Each prompt was sent the way llmwise sends a message in a side-by-side comparison, which offers no tools: the app's own system prompt, the model's own settings, and Pro's reply size limit (8,000 tokens). Read all five writing prompts and how every reply was scored.
Prompts like these to try yourself
Claude in llmwise
| Model | On Pro | On Free | Context window | Images | PDFs | Reasoning | API price per 1M, in / out |
|---|---|---|---|---|---|---|---|
| Claude Fable 5.1Anthropic | 31/mo on Pro | No | 1M tokens | Yes | Whole file | Yes | $10.00 / $50.00 |
| Claude Opus 5.5Anthropic | 62/mo on Pro | 1 message | 1M tokens | Yes | Whole file | Yes | $4.00 / $20.00 |
| Claude Sonnet 5.5Anthropic | 125/mo on Pro | Yes | 1M tokens | Yes | Whole file | Yes | $2.00 / $10.00 |
| Claude Sonnet 5Anthropic | 125/mo on Pro | Yes | 1M tokens | Yes | Whole file | Yes | $2.00 / $10.00 |
| Claude Haiku 4.5Anthropic | 250/mo on Pro | Yes | 200K tokens | Yes | Whole file | No | $1.00 / $5.00 |
| Claude Haiku 5.5Anthropic | 60/day on Pro | Yes | 1M tokens | Yes | Whole file | Yes | $0.10 / $0.50 |
Every limit is published. Paid plans also have a monthly fair-use limit on AI cost: Pro $7.50, Max $20, Ultra $42, Studio $85. Using every message on your plan at typical sizes stays under it; very large messages and heavy research use it faster. Every limit, explained.
What matters for writing
Voice and tone
The best draft is the one that sounds like you. Models differ in how well they pick up a voice from examples.
Following the brief
Word counts, audiences, must-include points: a good writing model keeps to the brief.
Editing, not just drafting
Most writing is editing. Ask for changes to a draft rather than a new one each time.
Claude for writing in llmwise
Drafts as documents
Drafts open as documents beside the chat: edit them, step through versions and download them as PDF, Word or Markdown.
Personas
Pick the Writer persona, or make your own with your voice and a default model.
Web search with sources
The model can search the web and cite what it found as source cards, or read a link you paste. On Free, web search works inside your 5 trial messages; on a paid plan a search counts as one more message of the model in use.
Switch models mid-chat
Start on a cheaper model; if the answer isn't good enough, switch models in the same chat. The next model sees the whole conversation, so you don't paste anything twice.
In llmwise, a message to Claude goes to its maker, Anthropic, or through OpenRouter when llmwise can't reach the maker directly. See the Privacy Policy.
Tips
Say who it's for, how long, and what it must include.
Paste a paragraph you like and ask for that voice.
Ask for three options for headlines and openings.
Get a second opinion: switch models and ask for a critique of the draft.
Questions
Is Claude good for writing?
In our test runs on October 7, 2026, Claude Fable 5.1 passed 3 of 5, Claude Opus 5.5 passed 4 of 5, Claude Sonnet 5.5 passed 4 of 5, Claude Sonnet 5 passed 4 of 5, Claude Haiku 4.5 passed 4 of 5, Claude Haiku 5.5 passed 3 of 5 of our writing prompts, against a best result of 4 of 5 among all 19 models. Every reply is published on this page and the methods page, so you can judge them yourself.
Which Claude model should I use for writing?
Start with Claude Haiku 5.5 for short rewrites, subject lines, grammar fixes and quick replies, and move up to Claude Fable 5.1 for long pieces that need structure and judgment: reports, essays, careful edits.
Can I use Claude for writing for free?
Yes: Claude Sonnet 5.5, Claude Sonnet 5, Claude Haiku 4.5, and Claude Haiku 5.5 are on the Free plan (a one-time trial of 5 messages, one of them can be on Claude Opus 5.5). Claude Fable 5.1 needs a paid plan.
Can I export what it writes?
Yes. Ask for a document and it downloads as PDF, Word or Markdown, with every version kept.
Claude, GPT, Gemini, DeepSeek, Grok, Kimi, GLM, and Mistral, in one chat.
See what a message costs before you send it. Free is 5 messages to try; sign in with an email link, no password or card.