Compare · ModelsLive · 2 picked · head to head
Claude Sonnet 4.5 vs DeepSeek V4 Flash
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Sonnet 4.5 wins on 3/4 benchmarks
Claude Sonnet 4.5 wins 3 of 4 shared benchmarks. Leads in reasoning · coding.
Category leads
general·DeepSeek V4 Flashreasoning·Claude Sonnet 4.5coding·Claude Sonnet 4.5
Hype vs Reality
Attention vs performance
Claude Sonnet 4.5
#207 by perf·#10 by attention
DeepSeek V4 Flash
#39 by perf·#6 by attention
Best value
DeepSeek V4 Flash
22.5x better value than Claude Sonnet 4.5
Claude Sonnet 4.5
4.2 pts/$
$9.00/M
DeepSeek V4 Flash
94.4 pts/$
$0.65/M
Vendor risk
Mixed exposure
One or more vendors flagged
Anthropic
$965.0B·Tier 1
DeepSeek
$3.4B·Tier 1
Head to head
4 benchmarks · 2 models
Claude Sonnet 4.5DeepSeek V4 Flash
Dtbench
DeepSeek V4 Flash leads by +5.3
Claude Sonnet 4.5
72.0
DeepSeek V4 Flash
77.3
Lmca
Claude Sonnet 4.5 leads by +3.4
Claude Sonnet 4.5
45.6
DeepSeek V4 Flash
42.2
SimpleBench
Claude Sonnet 4.5 leads by +9.6
SimpleBench · tests fundamental reasoning capabilities with straightforward problems designed to expose gaps in basic logical and spatial thinking.
Claude Sonnet 4.5
45.2
DeepSeek V4 Flash
35.6
WeirdML
Claude Sonnet 4.5 leads by +2.1
WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns.
Claude Sonnet 4.5
47.7
DeepSeek V4 Flash
45.6
Full benchmark table
| Benchmark | Claude Sonnet 4.5 | DeepSeek V4 Flash |
|---|---|---|
Dtbench | 72.0 | 77.3 |
Lmca | 45.6 | 42.2 |
SimpleBench SimpleBench · tests fundamental reasoning capabilities with straightforward problems designed to expose gaps in basic logical and spatial thinking. | 45.2 | 35.6 |
WeirdML WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns. | 47.7 | 45.6 |
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 | |
| $0.03 | $1.28 | 1.0M tokens (~524 books) | $3.39 |
People also compared