Compare · ModelsLive · 2 picked · head to head
Claude Opus 4.5 vs Claude 3.5 Sonnet
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Opus 4.5 wins on 11/11 benchmarks
Claude Opus 4.5 wins 11 of 11 shared benchmarks. Leads in arena · coding · math.
Category leads
arena·Claude Opus 4.5coding·Claude Opus 4.5math·Claude Opus 4.5knowledge·Claude Opus 4.5safety·Claude Opus 4.5reasoning·Claude Opus 4.5
Hype vs Reality
Attention vs performance
Claude Opus 4.5
#111 by perf·no signal
Claude 3.5 Sonnet
#127 by perf·no signal
Best value
Claude Opus 4.5
Claude Opus 4.5
3.0 pts/$
$15.00/M
Claude 3.5 Sonnet
—
no price
Vendor risk
Who is behind the model
Anthropic
$380.0B·Tier 1
Anthropic
$380.0B·Tier 1
Head to head
11 benchmarks · 2 models
Claude Opus 4.5Claude 3.5 Sonnet
Chatbot Arena Elo · Overall
Claude Opus 4.5 leads by +96.4
Claude Opus 4.5
1467.7
Claude 3.5 Sonnet
1371.4
Cybench
Claude Opus 4.5 leads by +64.5
Cybench · evaluates AI on real Capture-The-Flag cybersecurity challenges, testing vulnerability analysis, exploitation, and security reasoning.
Claude Opus 4.5
82.0
Claude 3.5 Sonnet
17.5
FrontierMath-2025-02-28-Private
Claude Opus 4.5 leads by +19.7
FrontierMath (Feb 2025) · original research-level math problems created by mathematicians, testing capabilities at the boundary of current AI mathematical reasoning.
Claude Opus 4.5
20.7
Claude 3.5 Sonnet
1.0
FrontierMath-Tier-4-2025-07-01-Private
Claude Opus 4.5 leads by +4.1
FrontierMath Tier 4 (Jul 2025) · the most challenging tier of frontier mathematics, containing problems that push the absolute limits of AI mathematical reasoning.
Claude Opus 4.5
4.2
Claude 3.5 Sonnet
0.1
GeoBench
Claude Opus 4.5 leads by +13.0
GeoBench · tests geographic knowledge and spatial reasoning across countries, landmarks, coordinates, and geopolitical understanding.
Claude Opus 4.5
75.0
Claude 3.5 Sonnet
62.0
GPQA diamond
Claude Opus 4.5 leads by +42.7
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
Claude Opus 4.5
81.4
Claude 3.5 Sonnet
38.7
GSO-Bench
Claude Opus 4.5 leads by +21.9
GSO-Bench · evaluates AI models on real-world open-source software engineering tasks, testing the ability to understand and resolve actual GitHub issues.
Claude Opus 4.5
26.5
Claude 3.5 Sonnet
4.6
OTIS Mock AIME 2024-2025
Claude Opus 4.5 leads by +79.7
OTIS Mock AIME 2024–2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills.
Claude Opus 4.5
86.1
Claude 3.5 Sonnet
6.4
Fortress
Claude Opus 4.5 leads by +0.6
Claude Opus 4.5
13.6
Claude 3.5 Sonnet
13.0
SimpleBench
Claude Opus 4.5 leads by +41.4
SimpleBench · tests fundamental reasoning capabilities with straightforward problems designed to expose gaps in basic logical and spatial thinking.
Claude Opus 4.5
54.4
Claude 3.5 Sonnet
13.0
WeirdML
Claude Opus 4.5 leads by +32.7
WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns.
Claude Opus 4.5
63.7
Claude 3.5 Sonnet
31.0
Full benchmark table
| Benchmark | Claude Opus 4.5 | Claude 3.5 Sonnet |
|---|---|---|
Chatbot Arena Elo · Overall | 1467.7 | 1371.4 |
Cybench Cybench · evaluates AI on real Capture-The-Flag cybersecurity challenges, testing vulnerability analysis, exploitation, and security reasoning. | 82.0 | 17.5 |
FrontierMath-2025-02-28-Private FrontierMath (Feb 2025) · original research-level math problems created by mathematicians, testing capabilities at the boundary of current AI mathematical reasoning. | 20.7 | 1.0 |
FrontierMath-Tier-4-2025-07-01-Private FrontierMath Tier 4 (Jul 2025) · the most challenging tier of frontier mathematics, containing problems that push the absolute limits of AI mathematical reasoning. | 4.2 | 0.1 |
GeoBench GeoBench · tests geographic knowledge and spatial reasoning across countries, landmarks, coordinates, and geopolitical understanding. | 75.0 | 62.0 |
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 81.4 | 38.7 |
GSO-Bench GSO-Bench · evaluates AI models on real-world open-source software engineering tasks, testing the ability to understand and resolve actual GitHub issues. | 26.5 | 4.6 |
OTIS Mock AIME 2024-2025 OTIS Mock AIME 2024–2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills. | 86.1 | 6.4 |
Fortress | 13.6 | 13.0 |
SimpleBench SimpleBench · tests fundamental reasoning capabilities with straightforward problems designed to expose gaps in basic logical and spatial thinking. | 54.4 | 13.0 |
WeirdML WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns. | 63.7 | 31.0 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| Claude Opus 4.5 | $5.00 | $25.00 | 200K tokens (~100 books) | $100.00 |
| Claude 3.5 Sonnet | — | — | — | — |
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