Compare · ModelsLive · 2 picked · head to head
Claude Opus 5.5 vs Claude Sonnet 5.5
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Opus 5.5 wins on 15/17 benchmarks
Claude Opus 5.5 wins 15 of 17 shared benchmarks. Leads in speed · coding · math.
Category leads
speed·Claude Opus 5.5agentic·Claude Sonnet 5.5coding·Claude Opus 5.5math·Claude Opus 5.5general·Claude Opus 5.5knowledge·Claude Sonnet 5.5
Hype vs Reality
Attention vs performance
Claude Opus 5.5
#3 by perf·#6 by attention
Claude Sonnet 5.5
#11 by perf·#10 by attention
Best value
Claude Sonnet 5.5
1.8x better value than Claude Opus 5.5
Claude Opus 5.5
6.9 pts/$
$12.00/M
Claude Sonnet 5.5
12.5 pts/$
$6.00/M
Vendor risk
Who is behind the model
Anthropic
$965.0B·Tier 1
Anthropic
$965.0B·Tier 1
Head to head
17 benchmarks · 2 models
Claude Opus 5.5Claude Sonnet 5.5
Artificial Analysis · CritPt
Claude Opus 5.5 leads by +0.3
Claude Opus 5.5
31.7
Claude Sonnet 5.5
31.4
Artificial Analysis · GDPval
Claude Opus 5.5 leads by +0.3
Claude Opus 5.5
67.3
Claude Sonnet 5.5
67.0
Artificial Analysis · Humanity's Last Exam
Claude Opus 5.5 leads by +6.4
Claude Opus 5.5
61.4
Claude Sonnet 5.5
55.0
Artificial Analysis · Long Context Reasoning
Claude Opus 5.5 leads by +2.0
Claude Opus 5.5
84.7
Claude Sonnet 5.5
82.7
Artificial Analysis · Quality Index
Claude Opus 5.5 leads by +1.6
Claude Opus 5.5
57.6
Claude Sonnet 5.5
56.0
Artificial Analysis · SciCode
Claude Opus 5.5 leads by +5.9
Claude Opus 5.5
66.9
Claude Sonnet 5.5
61.0
APEX-Agents
Claude Sonnet 5.5 leads by +2.0
APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments.
Claude Opus 5.5
73.5
Claude Sonnet 5.5
75.5
Frontiercode
Claude Opus 5.5 leads by +2.5
Claude Opus 5.5
54.6
Claude Sonnet 5.5
52.1
FrontierMath-Tier-4-v2-Private
Claude Opus 5.5 leads by +14.5
Claude Opus 5.5
95.0
Claude Sonnet 5.5
80.5
FrontierMath-Tiers-1-3-v2-Private
Claude Opus 5.5 leads by +2.5
Claude Opus 5.5
91.2
Claude Sonnet 5.5
88.8
Frontierswe
Claude Opus 5.5 leads by +0.4
Claude Opus 5.5
62.3
Claude Sonnet 5.5
61.9
Furniture Assembly
Claude Opus 5.5 leads by +11.9
Claude Opus 5.5
76.2
Claude Sonnet 5.5
64.3
GPQA diamond
Claude Sonnet 5.5 leads by +6.7
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
Claude Opus 5.5
87.5
Claude Sonnet 5.5
94.1
Mystery Game Puzzles
Claude Opus 5.5 leads by +6.6
Claude Opus 5.5
68.0
Claude Sonnet 5.5
61.5
OTIS Mock AIME 2024-2025
OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills.
Claude Opus 5.5
100.0
Claude Sonnet 5.5
100.0
Proofbench
Claude Opus 5.5
100.0
Claude Sonnet 5.5
100.0
SimpleQA Verified
Claude Opus 5.5 leads by +25.7
SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information.
Claude Opus 5.5
72.2
Claude Sonnet 5.5
46.5
Full benchmark table
| Benchmark | Claude Opus 5.5 | Claude Sonnet 5.5 |
|---|---|---|
Artificial Analysis · CritPt | 31.7 | 31.4 |
Artificial Analysis · GDPval | 67.3 | 67.0 |
Artificial Analysis · Humanity's Last Exam | 61.4 | 55.0 |
Artificial Analysis · Long Context Reasoning | 84.7 | 82.7 |
Artificial Analysis · Quality Index | 57.6 | 56.0 |
Artificial Analysis · SciCode | 66.9 | 61.0 |
APEX-Agents APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments. | 73.5 | 75.5 |
Frontiercode | 54.6 | 52.1 |
FrontierMath-Tier-4-v2-Private | 95.0 | 80.5 |
FrontierMath-Tiers-1-3-v2-Private | 91.2 | 88.8 |
Frontierswe | 62.3 | 61.9 |
Furniture Assembly | 76.2 | 64.3 |
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 87.5 | 94.1 |
Mystery Game Puzzles | 68.0 | 61.5 |
OTIS Mock AIME 2024-2025 OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills. | 100.0 | 100.0 |
Proofbench | 100.0 | 100.0 |
SimpleQA Verified SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information. | 72.2 | 46.5 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $4.00 | $20.00 | 1.0M tokens (~500 books) | $80.00 | |
| $2.00 | $10.00 | 1.0M tokens (~500 books) | $40.00 |