Best AI model for writing marketing and blog copy
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The verdict
- Scores 64 on writing, #13 of 30 models we track for this job.
- $0.72 per 1,000 drafts.
- Also the cheapest model that passes our test for this job.
- Scores 100 on writing, the highest of 30 models we track for this job.
- $27.20 per 1,000 drafts: the extra $26.48 per 1,000 buys 36 more points.
- Reads up to 1,000K tokens at once.
Writing is where people’s taste matters most, so we lean on preference votes rather than automatic tests. A good writing model follows your brief, keeps your voice and needs fewer rewrites.
How we tested
The writing score is 70% Arena creative-writing votes and 30% instruction following. A draft is about 800 tokens in (your brief and examples) and 1,200 out.
Scores are provisional until our own test rig runs these tasks. A model “passes our test” for this job at a score of 55 or more.
Scores and cost at your volume
| Model | Score | Passes | 1k drafts a month | 10k drafts a month | 100k drafts a month |
|---|---|---|---|---|---|
| Claude Opus 5.5 | 100 | Yes | $27.20 | $272 | $2720 |
| Gemini 4 Argon | 95 | Yes | $13.60 | $136 | $1360 |
| Claude Fable 5.1 | 90 | Yes | $68.00 | $680 | $6800 |
| Claude Opus 5 | 86 | Yes | $34.00 | $340 | $3400 |
| Muse Wonder | 81 | Yes | $27.20 | $272 | $2720 |
| Gemini 3.8 Flash | 80 | Yes | $5.10 | $51.00 | $510 |
| Qwen3.8 Max | 75 | Yes | $8.80 | $88.00 | $880 |
| Claude Sonnet 5.5 | 74 | Yes | $13.60 | $136 | $1360 |
| Muse Spark 1.3 | 70 | Yes | $6.10 | $61.00 | $610 |
| GLM-5.3 · open | 70 | Yes | $6.40 | $64.00 | $640 |
| Kimi K3 · open | 69 | Yes | $20.40 | $204 | $2040 |
| GPT-5.6 Sol | 67 | Yes | $27.20 | $272 | $2720 |
One draft is about 800 tokens in and 1,200 out, at list prices. Try your own numbers in the cost calculator.
Who should pick something else
- If you publish under your own name, take the premium pick and edit; rewrites cost more than tokens.
- For product descriptions in bulk, the budget pick usually does the job at a fraction of the price.
Questions
Which AI writes most like a person?
The best overall pick below has the strongest writing score among the models we track, from people’s blind votes in Arena.
Is it worth paying more for writing?
Only if you publish with light editing. The cost table shows what the premium pick adds per 1,000 drafts.
Changes to this guide
- 25 Oct 2026: First version, on provisional scores from Arena and Epoch AI.