Claude Sonnet 5.5 is the best AI for blog writing. It stays organised across long drafts, holds a consistent voice, and needs less editing than faster budget models. At $2/$10 per million tokens a full article costs pennies. For flagship pieces where the argument has to hold across thousands of words, Claude Opus 5.5 is the step up; for outlines and supporting posts, Claude Haiku 5.5 is enough.
The safest blog writing default, the cheaper option worth trying first, and the specialist pick — before you read the detail below.
Claude Sonnet 5.5 is the strongest answer here for blog writing — pick it when quality of output matters more than the $2.00/1M/1M input you pay for it.
Claude Haiku 5.5 handles the same job for about 95% less per token. Start here and only move up if the output is not good enough.
Claude Opus 5.5 is the fastest of these for blog writing — worth it when latency is what the reader notices, not the last few points of reasoning depth.
Claude Sonnet 5.5 is the cleanest long-form writing recommendation in the current directory.
Claude Opus 5.5 is worth it for flagship articles where structure has to hold across a long argument.
Claude Haiku 5.5 is a useful cheap drafting and editing assistant, not the best final writer.
Use Claude Sonnet 5.5 for regular posts, thought leadership and brand-sensitive editorial work.
Use Claude Haiku 5.5 for outlines, rewrites and supporting content at scale.
Use Gemini 3.1 Pro when a post starts from a large pile of source material or long transcripts.
Switch the scoring lens to see whether the blog writing answer changes when cost, speed, or long-document depth leads the decision.
Anthropic / Balanced / Oct 10, 2026
Near-Opus 5.5 quality on scoped work at half the price.
Ranks models by the broadest mix of coding, writing, research, and long-context usefulness.
The work is long, ambiguous and multi-step — Anthropic positions Opus 5.5 for exactly that — or you need the lowest possible price, where Haiku 5.5 costs a twentieth as much.
Where the blog writing recommendation shifts once you weigh price or latency differently.
Near-Opus 5.5 quality on scoped work at half the price.
Anthropic's new coding default — top SWE-bench Pro score at a lower price than Opus 5.
Anthropic's budget model, now with adjustable reasoning, at $0.10/$0.50.
Best for research and deep document analysis — 2M context at the best premium price.
List prices and published scores — the numbers this page's pick is built from.
| Model | Input | Output | Est. month | Context | Speed | Coding | Writing | Research |
|---|---|---|---|---|---|---|---|---|
| Claude Sonnet 5.5Anthropic | $2.00/1M | $10.00/1M | $40 | 1M tokens | Fast | 98 | 98 | 95 |
| Claude Opus 5.5Anthropic | $4.00/1M | $20.00/1M | $80 | 1M tokens | Deliberate | 100 | 97 | 99 |
| Claude Haiku 5.5Anthropic | $0.10/1M | $0.50/1M | $2.00 | 1M tokens | Very fast | 86 | 84 | 82 |
| Gemini 3.1 ProGoogle | $2.00/1M | $12.00/1M | $44 | 2M tokens | Balanced | 80 | 82 | 99 |
Scores out of 100 — how we evaluate models. “Est. month” is 10M in / 2M out at list price: a ceiling, no discounts.
Why each one is on the shortlist for blog writing, what it is genuinely good at, and where we would steer you away from it.
Ranked first here for blog writing: 98/100 on coding, with the widest margin of anything in this line-up.
Anthropic's September 28, 2026 Sonnet — built for well-scoped everyday work like features, bug fixes, documents, slides and spreadsheets, priced at $2/$10 and close to Opus 5.5 on most of Anthropic's launch rows.
The work is long, ambiguous and multi-step — Anthropic positions Opus 5.5 for exactly that — or you need the lowest possible price, where Haiku 5.5 costs a twentieth as much.
The model most people should default to in the Claude lineup. Sonnet 5.5 lands within a few points of Opus 5.5 on most of Anthropic's launch rows, beats it on Terminal-Bench 4.0, and costs half as much. Step up to Opus 5.5 only when the task is open-ended and long.
Full pricing, benchmark table and release notes on the Claude Sonnet 5.5 page.
The fastest model in this shortlist for blog writing. Pick it when turnaround is what your readers or users notice.
Anthropic's September 22, 2026 Opus — a step up from Opus 5 on agentic coding, long-running agent work and vision, at a lower $4/$20 list price and with fewer tokens spent per finished task.
Your tasks are well-scoped and latency-sensitive — Sonnet 5.5 is half the price and Anthropic says it is the fastest Sonnet yet.
The new premium coding default from Anthropic. Opus 5.5 posts the highest SWE-bench Pro figure in any launch table we track and costs less than Opus 5 did. Fable 5.1 still makes sense for the hardest open-ended research at $10/$50; for almost everything else Opus 5.5 is the better buy, and Sonnet 5.5 at half the price is close behind on well-scoped work.
Full pricing, benchmark table and release notes on the Claude Opus 5.5 page.
The cost-conscious pick for blog writing, about 95% less per token than Claude Sonnet 5.5 than the top choice while holding 86/100 on coding.
Anthropic's budget model, now with adjustable reasoning, at $0.10/$0.50. Full Claude Haiku 5.5 review →
The alternative to check next for blog writing — 80/100 on coding.
Best for research and deep document analysis — 2M context at the best premium price. Full Gemini 3.1 Pro review →
UseRightAI recommendations are based on practical decision factors people actually feel in day-to-day use.
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For blog writing, Claude Sonnet 5.5 (Anthropic) is our pick. Near-Opus 5.5 quality on scoped work at half the price. It costs $2/1M input and $10/1M output tokens, with a 1M-token context window — enough headroom for all but the largest blog writing jobs. Claude Opus 5.5 is the closest alternative if it doesn't fit your setup.
Because the work it is built for overlaps closely with blog writing: day-to-day feature and bug-fix work in an IDE or coding agent, where speed matters more than ceiling and drafting documents, slide decks and spreadsheets that need to be presentable on the first pass. The model most people should default to in the Claude lineup. Sonnet 5.5 lands within a few points of Opus 5.5 on most of Anthropic's launch rows, beats it on Terminal-Bench 4.0, and costs half as much. Step up to Opus 5.5 only when the task is open-ended and long.
On a moderate month — 10M input and 2M output tokens — Claude Sonnet 5.5 runs about $40.00 at list price, with no batch or caching discounts applied, so treat that as a ceiling. Claude Haiku 5.5 is the cheaper route at roughly $2.00 for the same volume, if blog writing is high-volume enough for price to lead the decision.
Anthropic itself says Opus 5.5 is better on loosely defined tasks that need longer reasoning. Trails Opus 5.5 on Humanity's Last Exam (64.5% vs 67.7%). Avoid it if the work is long, ambiguous and multi-step — Anthropic positions Opus 5.5 for exactly that — or you need the lowest possible price, where Haiku 5.5 costs a twentieth as much. None of that rules it out for blog writing on its own — but if one of those limits maps onto how you actually work, take the alternative on this page seriously rather than defaulting to the top pick.
Claude Haiku 5.5 at $0.1/1M input is the budget option here. Anthropic's budget model, now with adjustable reasoning, at $0.10/$0.50. Expect a quality step down on the hardest cases — the usual pattern is to route routine blog writing volume to Claude Haiku 5.5 and keep Claude Sonnet 5.5 for the work where a wrong answer is expensive.
Claude Haiku 5.5, rated very fast against Claude Sonnet 5.5's fast. Speed matters most for interactive and high-volume work; if your blog writing runs in the background, the slower and more capable model is usually the better trade.