Compare · ModelsLive · 2 picked · head to head
Claude Opus 5.5 vs DeepSeek V4.1 Flash
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Opus 5.5 wins on 10/10 benchmarks
Claude Opus 5.5 wins 10 of 10 shared benchmarks. Leads in speed · general.
Category leads
speed·Claude Opus 5.5general·Claude Opus 5.5
Hype vs Reality
Attention vs performance
Claude Opus 5.5
#3 by perf·#6 by attention
DeepSeek V4.1 Flash
#50 by perf·#5 by attention
Best value
DeepSeek V4.1 Flash
23.2x better value than Claude Opus 5.5
Claude Opus 5.5
6.9 pts/$
$12.00/M
DeepSeek V4.1 Flash
159.2 pts/$
$0.38/M
Vendor risk
Mixed exposure
One or more vendors flagged
Anthropic
$965.0B·Tier 1
DeepSeek
$3.4B·Tier 1
Head to head
10 benchmarks · 2 models
Claude Opus 5.5DeepSeek V4.1 Flash
Artificial Analysis · CritPt
Claude Opus 5.5 leads by +17.4
Claude Opus 5.5
31.7
DeepSeek V4.1 Flash
14.3
Artificial Analysis · GDPval
Claude Opus 5.5 leads by +12.3
Claude Opus 5.5
67.3
DeepSeek V4.1 Flash
55.0
Artificial Analysis · Humanity's Last Exam
Claude Opus 5.5 leads by +22.2
Claude Opus 5.5
61.4
DeepSeek V4.1 Flash
39.2
Artificial Analysis · Long Context Reasoning
Claude Opus 5.5 leads by +0.7
Claude Opus 5.5
84.7
DeepSeek V4.1 Flash
84.0
Artificial Analysis · MMMU Pro
Claude Opus 5.5 leads by +10.7
Claude Opus 5.5
87.7
DeepSeek V4.1 Flash
77.0
Artificial Analysis · Quality Index
Claude Opus 5.5 leads by +18.2
Claude Opus 5.5
57.6
DeepSeek V4.1 Flash
39.5
Artificial Analysis · SciCode
Claude Opus 5.5 leads by +15.0
Claude Opus 5.5
66.9
DeepSeek V4.1 Flash
51.9
Dtbench
Claude Opus 5.5 leads by +15.1
Claude Opus 5.5
98.2
DeepSeek V4.1 Flash
83.1
Lmca
Claude Opus 5.5 leads by +25.0
Claude Opus 5.5
80.3
DeepSeek V4.1 Flash
55.3
Proofbench
Claude Opus 5.5 leads by +46.0
Claude Opus 5.5
100.0
DeepSeek V4.1 Flash
54.0
Full benchmark table
| Benchmark | Claude Opus 5.5 | DeepSeek V4.1 Flash |
|---|---|---|
Artificial Analysis · CritPt | 31.7 | 14.3 |
Artificial Analysis · GDPval | 67.3 | 55.0 |
Artificial Analysis · Humanity's Last Exam | 61.4 | 39.2 |
Artificial Analysis · Long Context Reasoning | 84.7 | 84.0 |
Artificial Analysis · MMMU Pro | 87.7 | 77.0 |
Artificial Analysis · Quality Index | 57.6 | 39.5 |
Artificial Analysis · SciCode | 66.9 | 51.9 |
Dtbench | 98.2 | 83.1 |
Lmca | 80.3 | 55.3 |
Proofbench | 100.0 | 54.0 |
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 | |
| $0.15 | $0.60 | 1.0M tokens (~524 books) | $2.62 |
People also compared