Home › Compare › Claude Opus 5.5 vs Gemini 3.1 Pro

Claude Opus 5.5 vs Gemini 3.1 Pro

How does Claude Opus 5.5 (Anthropic) compare against Gemini 3.1 Pro (Google)? 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 96 and an aggregate capability rating of 667 vs 625 across 7 categories. Gemini 3.1 Pro still leads on Long Context. Gemini 3.1 Pro is the budget pick with a free tier.

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 →
Gemini 3.1 Pro
by Google
Score: 96/100
PriceFree – $20/mo
Pricing detailsFree – $249/mo
Context window1M
Free tierYes
API accessYes
Open sourceNo
Headline factsLeads GPQA Diamond at 94.3% · 1M context · free via Google AI Studio
Try Gemini 3.1 Pro → Full Gemini 3.1 Pro profile →

🔗 Affiliate link — we may earn a commission if you sign up, at no extra cost to you.

📊 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
Gemini 3.1 Pro
Math & Logice.g. AIME, MATH-500
96
92
Programminge.g. SWE-bench, LiveCodeBench
96
81
Reasoninge.g. GPQA, ARC
96
94
Knowledgee.g. MMLU-Pro
92
90
Long Contexte.g. MRCR, needle tests
95
96
Instruction Followinge.g. IFEval
95
93
Agent Capabilitye.g. Terminal-Bench, tool use
97
79

Why Claude Opus 5.5

Higher overall score (99 vs 96)
Leads on Math & Logic (96 vs 92)
Leads on Programming (96 vs 81)
Leads on Reasoning (96 vs 94)
Leads on Knowledge (92 vs 90)
Leads on Instruction Following (95 vs 93)
Leads on Agent Capability (97 vs 79)

Why Gemini 3.1 Pro

Has a free tier
Leads on Long Context (96 vs 95)
Leads GPQA Diamond at 94.3%
1M context

Open this comparison in the live tool →

❓ Frequently Asked Questions

Which is better: Claude Opus 5.5 or Gemini 3.1 Pro?

Claude Opus 5.5 has the higher AIVerso score (99 vs 96). The better choice still depends on your use case — Gemini 3.1 Pro leads on Long Context.

How much does Claude Opus 5.5 cost compared to Gemini 3.1 Pro?

Claude Opus 5.5: From $20/mo (Pro) ($4/$20 per 1M). Gemini 3.1 Pro: Free – $20/mo (Free – $249/mo). Only Gemini 3.1 Pro has a free tier.

What context window does each support?

Claude Opus 5.5: 1M tokens. Gemini 3.1 Pro: 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 Gemini 3.1 Pro open source?

Claude Opus 5.5 is a closed, proprietary model. Gemini 3.1 Pro is a closed, proprietary model.

🔗 Related comparisons

Claude Opus 5.5 vs GPT-6 AstraAnthropic vs OpenAI
Claude Opus 5.5 vs Claude Fable 5.1Anthropic head-to-head
GPT-6 Astra vs Gemini 3.1 ProOpenAI vs Google
Claude Opus 5.5 vs DeepSeek V4-ProAnthropic vs DeepSeek

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