Compare · ModelsLive · 2 picked · head to head
Claude Sonnet 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 8/8 benchmarks
DeepSeek V4.1 Flash 1017 wins 8 of 8 shared benchmarks. Leads in agentic · knowledge · math.
Category leads
agentic·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 5
#66 by perf·#11 by attention
DeepSeek V4.1 Flash 1017
#41 by perf·#4 by attention
Best value
DeepSeek V4.1 Flash 1017
26.5x better value than Claude Sonnet 5
Claude Sonnet 5
9.6 pts/$
$6.00/M
DeepSeek V4.1 Flash 1017
254.9 pts/$
$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
8 benchmarks · 2 models
Claude Sonnet 5DeepSeek V4.1 Flash 1017
APEX-Agents
DeepSeek V4.1 Flash 1017 leads by +15.3
APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments.
Claude Sonnet 5
54.5
DeepSeek V4.1 Flash 1017
69.8
Chess Puzzles
DeepSeek V4.1 Flash 1017 leads by +1.0
Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities.
Claude Sonnet 5
42.1
DeepSeek V4.1 Flash 1017
43.2
FrontierMath-Tier-4-v2-Private
DeepSeek V4.1 Flash 1017 leads by +17.1
Claude Sonnet 5
29.3
DeepSeek V4.1 Flash 1017
46.3
FrontierMath-Tiers-1-3-v2-Private
DeepSeek V4.1 Flash 1017 leads by +5.9
Claude Sonnet 5
69.1
DeepSeek V4.1 Flash 1017
75.0
GPQA diamond
DeepSeek V4.1 Flash 1017 leads by +3.7
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
Claude Sonnet 5
91.0
DeepSeek V4.1 Flash 1017
94.7
Mystery Game Puzzles
DeepSeek V4.1 Flash 1017 leads by +15.4
Claude Sonnet 5
28.4
DeepSeek V4.1 Flash 1017
43.8
OTIS Mock AIME 2024-2025
DeepSeek V4.1 Flash 1017 leads by +4.7
OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills.
Claude Sonnet 5
94.7
DeepSeek V4.1 Flash 1017
99.4
SimpleQA Verified
DeepSeek V4.1 Flash 1017 leads by +8.8
SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information.
Claude Sonnet 5
33.7
DeepSeek V4.1 Flash 1017
42.5
Full benchmark table
| Benchmark | Claude Sonnet 5 | DeepSeek V4.1 Flash 1017 |
|---|---|---|
APEX-Agents APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments. | 54.5 | 69.8 |
Chess Puzzles Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities. | 42.1 | 43.2 |
FrontierMath-Tier-4-v2-Private | 29.3 | 46.3 |
FrontierMath-Tiers-1-3-v2-Private | 69.1 | 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. | 91.0 | 94.7 |
Mystery Game Puzzles | 28.4 | 43.8 |
OTIS Mock AIME 2024-2025 OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills. | 94.7 | 99.4 |
SimpleQA Verified SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information. | 33.7 | 42.5 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $2.00 | $10.00 | 1.0M tokens (~500 books) | $40.00 | |
| $0.01 | $0.50 | 1.0M tokens (~524 books) | $1.29 |
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