Compare · ModelsLive · 2 picked · head to head
Claude Sonnet 5 vs DeepSeek V4.1 Flash
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Sonnet 5 wins on 7/13 benchmarks
Claude Sonnet 5 wins 7 of 13 shared benchmarks. Leads in agentic · general.
Category leads
agentic·Claude Sonnet 5knowledge·DeepSeek V4.1 Flashgeneral·Claude Sonnet 5coding·DeepSeek V4.1 Flashmath·DeepSeek V4.1 Flash
Hype vs Reality
Attention vs performance
Claude Sonnet 5
#66 by perf·#11 by attention
DeepSeek V4.1 Flash
#97 by perf·#4 by attention
Best value
DeepSeek V4.1 Flash
18.2x better value than Claude Sonnet 5
Claude Sonnet 5
9.6 pts/$
$6.00/M
DeepSeek V4.1 Flash
175.1 pts/$
$0.31/M
Vendor risk
Mixed exposure
One or more vendors flagged
Anthropic
$965.0B·Tier 1
DeepSeek
$3.4B·Tier 1
Head to head
13 benchmarks · 2 models
Claude Sonnet 5DeepSeek V4.1 Flash
APEX-Agents
Claude Sonnet 5 leads by +15.0
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
39.5
Chess Puzzles
DeepSeek V4.1 Flash leads by +3.2
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
45.3
Dtbench
Claude Sonnet 5 leads by +4.3
Claude Sonnet 5
87.5
DeepSeek V4.1 Flash
83.1
Frontiercode
DeepSeek V4.1 Flash leads by +1.1
Claude Sonnet 5
42.7
DeepSeek V4.1 Flash
43.9
FrontierMath-Tier-4-v2-Private
Claude Sonnet 5 leads by +2.4
Claude Sonnet 5
29.3
DeepSeek V4.1 Flash
26.8
FrontierMath-Tiers-1-3-v2-Private
DeepSeek V4.1 Flash leads by +1.8
Claude Sonnet 5
69.1
DeepSeek V4.1 Flash
70.9
GPQA diamond
Claude Sonnet 5 leads by +1.0
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
90.0
Lmca
Claude Sonnet 5 leads by +3.6
Claude Sonnet 5
58.9
DeepSeek V4.1 Flash
55.3
Mystery Game Puzzles
DeepSeek V4.1 Flash leads by +8.8
Claude Sonnet 5
28.4
DeepSeek V4.1 Flash
37.2
OTIS Mock AIME 2024-2025
DeepSeek V4.1 Flash leads by +3.6
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
98.3
Proofbench
Claude Sonnet 5 leads by +23.0
Claude Sonnet 5
77.0
DeepSeek V4.1 Flash
54.0
SimpleQA Verified
DeepSeek V4.1 Flash leads by +9.2
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
42.9
Surface Evolver Bench
Claude Sonnet 5 leads by +13.8
Claude Sonnet 5
60.0
DeepSeek V4.1 Flash
46.3
Full benchmark table
| Benchmark | Claude Sonnet 5 | DeepSeek V4.1 Flash |
|---|---|---|
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 | 39.5 |
Chess Puzzles Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities. | 42.1 | 45.3 |
Dtbench | 87.5 | 83.1 |
Frontiercode | 42.7 | 43.9 |
FrontierMath-Tier-4-v2-Private | 29.3 | 26.8 |
FrontierMath-Tiers-1-3-v2-Private | 69.1 | 70.9 |
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 91.0 | 90.0 |
Lmca | 58.9 | 55.3 |
Mystery Game Puzzles | 28.4 | 37.2 |
OTIS Mock AIME 2024-2025 OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills. | 94.7 | 98.3 |
Proofbench | 77.0 | 54.0 |
SimpleQA Verified SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information. | 33.7 | 42.9 |
Surface Evolver Bench | 60.0 | 46.3 |
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 | |
| $0.05 | $0.57 | 1.0M tokens (~524 books) | $1.80 |