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 17/19 benchmarks
Claude Opus 5.5 wins 17 of 19 shared benchmarks. Leads in speed · knowledge · coding.
Category leads
speed·Claude Opus 5.5agentic·Claude Sonnet 5.5knowledge·Claude Opus 5.5coding·Claude Opus 5.5math·Claude Opus 5.5general·Claude Opus 5.5
Hype vs Reality
Attention vs performance
Claude Opus 5.5
#12 by perf·#7 by attention
Claude Sonnet 5.5
#34 by perf·#12 by attention
Best value
Claude Sonnet 5.5
1.8x better value than Claude Opus 5.5
Claude Opus 5.5
6.2 pts/$
$12.00/M
Claude Sonnet 5.5
11.0 pts/$
$6.00/M
Vendor risk
Who is behind the model
Anthropic
$965.0B·Tier 1
Anthropic
$965.0B·Tier 1
Head to head
19 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 +1.4
Claude Opus 5.5
68.3
Claude Sonnet 5.5
66.9
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
Chess Puzzles
Claude Opus 5.5 leads by +8.4
Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities.
Claude Opus 5.5
65.3
Claude Sonnet 5.5
56.9
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
SpireClimb
Claude Opus 5.5 leads by +2.0
Claude Opus 5.5
3.3
Claude Sonnet 5.5
1.3
Full benchmark table
| Benchmark | Claude Opus 5.5 | Claude Sonnet 5.5 |
|---|---|---|
Artificial Analysis · CritPt | 31.7 | 31.4 |
Artificial Analysis · GDPval | 68.3 | 66.9 |
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 |
Chess Puzzles Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities. | 65.3 | 56.9 |
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 |
SpireClimb | 3.3 | 1.3 |
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 |
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