Anthropic · premium
Is Claude Sonnet 4.5 good?
Claude Sonnet 4.5 places top-3 in 1 of 22 task areas we tested. It's strongest at summarization & meeting notes and weakest at content & brand. It's a premium option ($18/1M tokens).
Our take
Strengths
Weak spots
How Claude Sonnet 4.5 ranks, task by task
Rank is the position in each field; Rating is the absolute quality bar. A model can be rated "Excellent" yet sit mid-table when the whole field is strong — and vice-versa.
| Task area | Rank | Percentile | Rating |
|---|---|---|---|
| Summarization & Meeting Notes | #2 of 44 |
|
Excellent |
| Sales | #7 of 44 |
|
Strong |
| Landing Pages | #9 of 56 |
|
Usable |
| Frontend & Landing Pages | #19 of 93 |
|
Needs editing |
| RAG, Safety & Grounding | #8 of 35 |
|
Excellent |
| Creative & Comedy | #11 of 44 |
|
Elo |
| Data & Analytics | #17 of 69 |
|
Excellent |
| Knowledge & Docs | #23 of 94 |
|
Strong |
| Executive Assistant | #13 of 50 |
|
Strong |
| AI Strategy | #16 of 50 |
|
Strong |
| Customer Support | #15 of 43 |
|
Strong |
| Coding | #19 of 52 |
|
Strong |
| Translation & Localization | #17 of 44 |
|
Excellent |
| Research & Competitive Analysis | #18 of 44 |
|
Usable |
| Training & Education | #21 of 44 |
|
Excellent |
| Investor & Pitch | #24 of 50 |
|
Usable |
| Presentations & Decks | #22 of 44 |
|
Strong |
| Structured Output | #23 of 43 |
|
Strong |
| Chef / Home Cooking | #31 of 50 |
|
Usable |
| Legal & HR | #29 of 44 |
|
Strong |
| Product & Project Management | #30 of 44 |
|
Strong |
| Content & Brand | #37 of 50 |
|
Usable |
Industry benchmarks
Standardized third-party scores, shown for context — these are independent of our real-task tests.
Design Arena — human preference (avg Elo 1217)
Headline vs. real-world
Source: Artificial Analysis (artificialanalysis.ai) via OpenRouter (openrouter.ai/rankings). (2026-06-29) · Source: Design Arena (www.designarena.ai) via OpenRouter (openrouter.ai/rankings). (2026-06-29)
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Frequently asked
Is Claude Sonnet 4.5 any good?
Claude Sonnet 4.5 places top-3 in 1 of 22 task areas we benchmarked. It performs best at Summarization & Meeting Notes.
What is Claude Sonnet 4.5 best at?
Its strongest task areas are Summarization & Meeting Notes, Sales, Landing Pages.
Is there a cheaper alternative to Claude Sonnet 4.5?
Qwen3.5 Plus 2026-02-15 is 90% cheaper and stays competitive on quality across our benchmarks.
How we test & rank
Each model is scored on real tasks across 22 task areas by an LLM judge with deterministic checks. "Percentile" is this model's standing within each area's field; the cross-area figures are rank-based so quality and Elo scores are never mixed.
This page is Spring Prompt, running
We just did this for every model. Do it for your prompt.
The rankings above come from running real tasks through real models and scoring every output. Spring Prompt is that same engine — pointed at your prompt, your test cases, and your definition of good.
- Generate test cases from your prompt — no eval set required to start.
- Compare models side by side with quality, cost and latency in one matrix.
- Optimise the winner until the scores say it's ready to ship.
Prompt × model results
12 test cases · 3 evals