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Claude Opus 5.5 vs DeepSeek V4-Pro

How does Claude Opus 5.5 (Anthropic) compare against DeepSeek V4-Pro (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-Pro is the budget pick with a free tier. DeepSeek V4-Pro 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 factsFable-class coding for less · #1 SWE-bench Pro (89.9%) · #1 Terminal-Bench 4.0 (66.4%) · $4/$20 per 1M · 1M context
🔗 Try Claude Opus 5.5 → Full Claude Opus 5.5 profile →
DeepSeek V4-Pro
by DeepSeek
Score: 92/100
PriceVery cheap API
Pricing detailsFree (Open Source)
Context window128K
Free tierYes
API accessYes
Open sourceYes
Headline factsFrontier reasoning at a fraction of the cost
Try DeepSeek V4-Pro → Full DeepSeek V4-Pro profile →

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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-Pro
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)
Larger context window (1M vs 128K)
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)

Why DeepSeek V4-Pro

Has a free tier
Open source / open weights
Frontier reasoning at a fraction of the cost

Open this comparison in the live tool →

❓ Frequently Asked Questions

Which is better: Claude Opus 5.5 or DeepSeek V4-Pro?

Claude Opus 5.5 has the higher AIVerso score (99 vs 92). The better choice still depends on your use case — DeepSeek V4-Pro remains a strong alternative.

How much does Claude Opus 5.5 cost compared to DeepSeek V4-Pro?

Claude Opus 5.5: From $20/mo (Pro) ($4/$20 per 1M). DeepSeek V4-Pro: Very cheap API (Free (Open Source)). Only DeepSeek V4-Pro has a free tier.

What context window does each support?

Claude Opus 5.5: 1M tokens. DeepSeek V4-Pro: 128K 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-Pro open source?

Claude Opus 5.5 is a closed, proprietary model. DeepSeek V4-Pro is open source / open weights.

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How we compare: Scores and capability ratings are based on public benchmarks and provider documentation — not on commission rates. Last updated: September 29, 2026.