Compare · ModelsLive · 2 picked · head to head
Claude Sonnet 4.5 vs DeepSeek V4.1 Flash 1017
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
DeepSeek V4.1 Flash 1017 wins on 9/9 benchmarks
DeepSeek V4.1 Flash 1017 wins 9 of 9 shared benchmarks. Leads in reasoning · knowledge · math.
Category leads
reasoning·DeepSeek V4.1 Flash 1017knowledge·DeepSeek V4.1 Flash 1017math·DeepSeek V4.1 Flash 1017general·DeepSeek V4.1 Flash 1017
Hype vs Reality
Attention vs performance
Claude Sonnet 4.5
#221 by perf·#11 by attention
DeepSeek V4.1 Flash 1017
#41 by perf·#4 by attention
Best value
DeepSeek V4.1 Flash 1017
60.5x better value than Claude Sonnet 4.5
Claude Sonnet 4.5
4.2 pts/$
$9.00/M
DeepSeek V4.1 Flash 1017
254.9 pts/$
$0.25/M
Vendor risk
Mixed exposure
One or more vendors flagged
Anthropic
$965.0B·Tier 1
DeepSeek
$3.4B·Tier 1
Head to head
9 benchmarks · 2 models
Claude Sonnet 4.5DeepSeek V4.1 Flash 1017
ARC-AGI
DeepSeek V4.1 Flash 1017 leads by +30.8
ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization.
Claude Sonnet 4.5
63.7
DeepSeek V4.1 Flash 1017
94.5
ARC-AGI-2
DeepSeek V4.1 Flash 1017 leads by +64.5
ARC-AGI-2 · the second iteration of the Abstraction and Reasoning Corpus, testing novel pattern recognition and abstract reasoning without prior training data.
Claude Sonnet 4.5
13.6
DeepSeek V4.1 Flash 1017
78.1
Chess Puzzles
DeepSeek V4.1 Flash 1017 leads by +37.9
Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities.
Claude Sonnet 4.5
5.3
DeepSeek V4.1 Flash 1017
43.2
FrontierMath-Tier-4-v2-Private
DeepSeek V4.1 Flash 1017 leads by +43.9
Claude Sonnet 4.5
2.4
DeepSeek V4.1 Flash 1017
46.3
FrontierMath-Tiers-1-3-v2-Private
DeepSeek V4.1 Flash 1017 leads by +49.9
Claude Sonnet 4.5
25.1
DeepSeek V4.1 Flash 1017
75.0
GPQA diamond
DeepSeek V4.1 Flash 1017 leads by +15.1
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
Claude Sonnet 4.5
79.6
DeepSeek V4.1 Flash 1017
94.7
Mystery Game Puzzles
DeepSeek V4.1 Flash 1017 leads by +35.3
Claude Sonnet 4.5
8.6
DeepSeek V4.1 Flash 1017
43.8
OTIS Mock AIME 2024-2025
DeepSeek V4.1 Flash 1017 leads by +21.7
OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills.
Claude Sonnet 4.5
77.8
DeepSeek V4.1 Flash 1017
99.4
SimpleQA Verified
DeepSeek V4.1 Flash 1017 leads by +11.8
SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information.
Claude Sonnet 4.5
30.7
DeepSeek V4.1 Flash 1017
42.5
Full benchmark table
| Benchmark | Claude Sonnet 4.5 | DeepSeek V4.1 Flash 1017 |
|---|---|---|
ARC-AGI ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization. | 63.7 | 94.5 |
ARC-AGI-2 ARC-AGI-2 · the second iteration of the Abstraction and Reasoning Corpus, testing novel pattern recognition and abstract reasoning without prior training data. | 13.6 | 78.1 |
Chess Puzzles Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities. | 5.3 | 43.2 |
FrontierMath-Tier-4-v2-Private | 2.4 | 46.3 |
FrontierMath-Tiers-1-3-v2-Private | 25.1 | 75.0 |
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 79.6 | 94.7 |
Mystery Game Puzzles | 8.6 | 43.8 |
OTIS Mock AIME 2024-2025 OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills. | 77.8 | 99.4 |
SimpleQA Verified SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information. | 30.7 | 42.5 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $3.00 | $15.00 | 1.0M tokens (~500 books) | $60.00 | |
| $0.01 | $0.50 | 1.0M tokens (~524 books) | $1.29 |
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