Compare · ModelsLive · 2 picked · head to head
Claude Opus 5.5 vs Kimi K3.1 Pro
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Opus 5.5 wins on 8/9 benchmarks
Claude Opus 5.5 wins 8 of 9 shared benchmarks. Leads in knowledge · math · general.
Category leads
knowledge·Claude Opus 5.5math·Claude Opus 5.5general·Claude Opus 5.5
Hype vs Reality
Attention vs performance
Claude Opus 5.5
#10 by perf·#5 by attention
Kimi K3.1 Pro
#29 by perf·#15 by attention
Best value
Kimi K3.1 Pro
1.8x better value than Claude Opus 5.5
Claude Opus 5.5
6.2 pts/$
$12.00/M
Kimi K3.1 Pro
11.3 pts/$
$6.00/M
Vendor risk
Who is behind the model
Anthropic
$965.0B·Tier 1
Moonshot AI
$50.0B·Tier 1
Head to head
9 benchmarks · 2 models
Claude Opus 5.5Kimi K3.1 Pro
Chess Puzzles
Claude Opus 5.5 leads by +23.1
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
Kimi K3.1 Pro
42.1
FrontierMath-Tier-4-v2-Private
Claude Opus 5.5 leads by +29.2
Claude Opus 5.5
95.0
Kimi K3.1 Pro
65.8
FrontierMath-Tiers-1-3-v2-Private
Claude Opus 5.5 leads by +13.7
Claude Opus 5.5
96.0
Kimi K3.1 Pro
82.4
Furniture Assembly
Claude Opus 5.5 leads by +39.3
Claude Opus 5.5
76.2
Kimi K3.1 Pro
36.9
GPQA diamond
Kimi K3.1 Pro leads by +5.0
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
91.1
Kimi K3.1 Pro
96.1
Mystery Game Puzzles
Claude Opus 5.5 leads by +31.9
Claude Opus 5.5
68.0
Kimi K3.1 Pro
36.1
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
Kimi K3.1 Pro
100.0
Proofbench
Claude Opus 5.5 leads by +9.0
Claude Opus 5.5
100.0
Kimi K3.1 Pro
91.0
SimpleQA Verified
Claude Opus 5.5 leads by +10.0
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
Kimi K3.1 Pro
62.2
Full benchmark table
| Benchmark | Claude Opus 5.5 | Kimi K3.1 Pro |
|---|---|---|
Chess Puzzles Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities. | 65.3 | 42.1 |
FrontierMath-Tier-4-v2-Private | 95.0 | 65.8 |
FrontierMath-Tiers-1-3-v2-Private | 96.0 | 82.4 |
Furniture Assembly | 76.2 | 36.9 |
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 91.1 | 96.1 |
Mystery Game Puzzles | 68.0 | 36.1 |
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 | 91.0 |
SimpleQA Verified SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information. | 72.2 | 62.2 |
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 (~524 books) | $40.00 |
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