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Claude Opus 5.5 vs DeepSeek V4.1 Flash
Claude Opus 5.5 vs DeepSeek V4.1 Flash
How does Claude Opus 5.5 (Anthropic) compare against DeepSeek V4.1 Flash (DeepSeek)? Side-by-side scores, capability ratings and pricing, plus a clear verdict.
🏆 Quick verdict
Claude Opus 5.5 comes out ahead with an AIVerso score of 99 vs 92 and an aggregate capability rating of 667 vs 595 across 7 categories. DeepSeek V4.1 Flash is the budget pick with a free tier. DeepSeek V4.1 Flash is open source and can be self-hosted.
Overall winner
Claude Opus 5.5
by Anthropic
Score: 99/100
PriceFrom $20/mo (Pro)
Pricing details$4/$20 per 1M
Context window1M
Free tierNo
API accessYes
Open sourceNo
Headline facts#1 on the Artificial Analysis Intelligence Index (58) · SWE-bench Pro 89.9% · OSWorld 2.1 81.8% · $4/$20 per 1M · 1M context
🔗 Try Claude Opus 5.5 →
Full Claude Opus 5.5 profile →
DeepSeek V4.1 Flash
by DeepSeek
Score: 92/100
PriceFree · API $0.30/$1.20 per 1M
Pricing detailsFree chat at chat.deepseek.com · API $0.30/$1.20 per 1M tokens, cheaper off-peak · Free weights (MIT license)
Context window1M
Free tierYes
API accessYes
Open sourceYes
Headline factsDeepSeek's current flagship (Oct 17 build) · AA Intelligence Index 45 · DeepSWE v1.1 77.0 · 1M context · MIT open weights
Try DeepSeek V4.1 Flash →
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📊 Capability ratings
AIVerso capability ratings (0–100) per category — an editorial summary informed by public benchmark results. Higher is better.
Category
Claude Opus 5.5
DeepSeek V4.1 Flash
Math & Logice.g. AIME, MATH-500
96
90
Programminge.g. SWE-bench, LiveCodeBench
96
81
Reasoninge.g. GPQA, ARC
96
85
Knowledgee.g. MMLU-Pro
92
85
Long Contexte.g. MRCR, needle tests
95
92
Instruction Followinge.g. IFEval
95
86
Agent Capabilitye.g. Terminal-Bench, tool use
97
76
Why Claude Opus 5.5
Higher overall score (99 vs 92)
Leads on Math & Logic (96 vs 90)
Leads on Programming (96 vs 81)
Leads on Reasoning (96 vs 85)
Leads on Knowledge (92 vs 85)
Leads on Long Context (95 vs 92)
Leads on Instruction Following (95 vs 86)
Why DeepSeek V4.1 Flash
Has a free tier
Lower API price (Free · API $0.30/$1.20 per 1M vs $4/$20 per 1M)
Open source / open weights
DeepSeek's current flagship (Oct 17 build)
AA Intelligence Index 45
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❓ Frequently Asked Questions
Which is better: Claude Opus 5.5 or DeepSeek V4.1 Flash?
Claude Opus 5.5 has the higher AIVerso score (99 vs 92). The better choice still depends on your use case — DeepSeek V4.1 Flash is the cheaper option.
How much does Claude Opus 5.5 cost compared to DeepSeek V4.1 Flash?
Claude Opus 5.5: From $20/mo (Pro) ($4/$20 per 1M). DeepSeek V4.1 Flash: Free · API $0.30/$1.20 per 1M (Free chat at chat.deepseek.com · API $0.30/$1.20 per 1M tokens, cheaper off-peak · Free weights (MIT license)). Only DeepSeek V4.1 Flash has a free tier.
What context window does each support?
Claude Opus 5.5: 1M tokens. DeepSeek V4.1 Flash: 1M tokens. The context window determines how much text, code or chat history a model can process at once.
Are Claude Opus 5.5 and DeepSeek V4.1 Flash open source?
Claude Opus 5.5 is a closed, proprietary model. DeepSeek V4.1 Flash is open source / open weights.
How we compare: Scores and capability ratings are based on public benchmarks and provider documentation — not on commission rates. Last updated: October 22, 2026.