TUE, JULY 28, 2026
Independent · In‑Depth · Practitioner‑Tested
Claude Writing

Best Claude Opus 5 and Sonnet 5 Prompts for Writing (2026)

Claude Opus 5 and Sonnet 5 consistently produce the highest-quality long-form writing of any AI model in July 2026 — a lead documented across writing benchmarks and user testing since Claude 3 Opus. With 1M context and 128K output on Opus 5, Claude can write book chapters, complete reports, and long-form content without truncating. Sonnet 5 at $2/$10/M (intro through August 31) is the best value writing model available. These prompts are optimised for claude.ai Pro/Max, Claude Cowork, and the API.

⌨️ 6 prompts 🕐 Updated Jul 28, 2026
💡 How to use these prompts: Replace everything in [BRACKETS] with your specific details before sending. Click Copy to copy any prompt to your clipboard instantly.
1
Write a Long-Form Essay With a Thesis
Write a thesis-driven essay that argues a clear position
Write a [LENGTH]-word essay on the following topic. Develop a clear thesis and defend it through the essay — do not hedge or sit on the fence.

Topic: [TOPIC]
Thesis (your position): [WHAT YOU WANT TO ARGUE]
Audience: [WHO READS THIS]
Tone: [ACADEMIC / JOURNALISTIC / PERSUASIVE / CONVERSATIONAL]

Structure: introduction with thesis, 3-4 body sections each with a distinct argument, conclusion that extends the thesis rather than just restating it.

Use specific examples, evidence, and named sources where possible. Every paragraph should advance the argument — no filler.
2
Rewrite in a Specific Author's Voice
Rewrite any passage in a named author's distinctive voice
Rewrite the following passage in the style of [AUTHOR NAME]. Capture their characteristic sentence rhythm, vocabulary level, use of detail, and overall tone — not just their subject matter.

Specific style traits to capture: [LIST 3-4 THINGS YOU NOTICE ABOUT HOW THIS AUTHOR WRITES]

Original passage to rewrite: [PASTE TEXT]

Do not add a footnote explaining the rewrite. Just produce the rewritten version.
3
Write a Complete Blog Post
Write a complete publication-ready blog post from a brief
Write a complete, publication-ready blog post on the following topic. Do not truncate or end with a note — write the full post.

Title: [TITLE OR GENERATE ONE]
Topic: [DESCRIBE]
Target reader: [WHO AND THEIR KNOWLEDGE LEVEL]
Word count: [TARGET — Claude Opus 5 supports up to 128K output tokens]
Tone: [VOICE]
SEO keyword to include naturally: [PRIMARY KEYWORD]

Structure: hook opening (no "In today's world" or similar), body with clear H2 sections, conclusion with a specific takeaway or CTA. Every section must add new information — no repetition of the intro.
4
Edit for Voice Consistency Across a Long Document
Unify voice across a long document written by multiple people
The following document was written by multiple people or across multiple sessions and has inconsistent voice. Read the entire document and then rewrite it in a single consistent voice throughout.

Target voice: [DESCRIBE — e.g. direct and data-driven, warm and conversational, formal and precise]
Voice examples (paste 1-2 paragraphs that best represent the target): [PASTE EXAMPLES]

Rules: do not change the facts or structure, only the voice and sentence-level style. Flag any section where you made a significant tone change so I can review it.

Full document: [PASTE DOCUMENT]
5
Write a Professional Email
Write a professional email for any workplace situation
Write a professional email for the following situation.

Context: [DESCRIBE THE SITUATION IN FULL]
From: [YOUR ROLE]
To: [RECIPIENT ROLE AND RELATIONSHIP]
Goal: [WHAT YOU WANT THE EMAIL TO ACCOMPLISH]
Tone: [FORMAL / PROFESSIONAL / WARM-PROFESSIONAL]
Length: [SHORT / MEDIUM / DETAILED]
What not to say: [ANYTHING TO AVOID]

Write the complete email including subject line. No explanation after the email — just the final version.
6
Write a Case Study From Raw Material
Turn raw notes or interview transcripts into a polished case study
Write a case study from the following raw material. Format it for [AUDIENCE — clients / prospects / internal use / publication].

Structure:
1. Challenge — what problem existed before
2. Approach — what was done and why
3. Results — specific measurable outcomes
4. Key insight — one lesson that applies beyond this specific case

Raw material: [PASTE YOUR NOTES, DATA, OR INTERVIEW TRANSCRIPT]

Rules: lead every section with the most important information. Use specific numbers. Do not write "Company X saw a significant improvement" — write "Company X reduced time-to-hire by 34%."