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Claude Opus 5.5

by Anthropic · Text & Chat · Code

AA Intelligence Index 59 · SWE-bench Pro 89.9% · OSWorld 2.1 81.8% · $4/$20 per 1M · 1M context.

98/100AIVerso score
#3 of 54in Text & Chat
From $20/mo (Pro)Starting price
NoFree tier
🔗 Try Claude Opus 5.5 →Compare with alternatives →

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What is Claude Opus 5.5?

Claude Opus 5.5 is Anthropic’s flagship model and currently the highest-ranked publicly available model on the Artificial Analysis Intelligence Index. It is available on the Claude Pro plan and via API with a 1M-token context.

Best for

Claude Opus 5.5 pricing

Claude Opus 5.5 has no free tier. Price: From $20/mo (Pro); API access costs $4/$20 per 1M.

Plans & prices

Looking for something cheaper? Gemini 4 Carbon by Google costs $2/$10 per 1M tokens (API, until Nov 30).

Prices as published by Anthropic. This page was last updated on November 13, 2026; prices and plans change often, so check the provider’s pricing page before you buy.

🔗 Check current Claude Opus 5.5 prices →

At a glance

ProviderAnthropic
CategoryText & Chat, Code
Starting priceFrom $20/mo (Pro)
Free tierNo
API accessYes
Open sourceNo
Context window1M tokens
Mobile appiOS & Android

Key facts

Claude Opus 5.5 benchmarks

LeaderboardResult
Artificial Analysis Intelligence Index v559 points

The Artificial Analysis Intelligence Index combines several independent evaluations of reasoning, knowledge, maths and coding — see our full AA Index v5 ranking.

Capability ratings

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

AIVerso capability ratings (0–100), an editorial summary informed by public benchmark results. Higher is better.

Features

✗ Image generation
✗ Video generation
✗ Native audio model
✓ Web search
✓ Voice mode (app)
✓ PDF analysis

Strengths

Top 3 of 54 AI chatbots & text models on AIVerso (#3)
Top-tier AIVerso score (98/100)
Large 1M token context window
Built-in web search
API access for developers
iOS & Android apps

Limitations

No free tier
Closed model — cannot be self-hosted

Best alternatives to Claude Opus 5.5

Gemini 4 Carbon
Google · $2/$10 per 1M tokens (API, until Nov 30) — Lower API price ($2/$10 per 1M tokens (API, until Nov 30) vs $4/$20 per 1M)
98
GPT-6 Astra
OpenAI · From $20/mo (Plus) — Score 98/100
Claude Opus 5.5 vs GPT-6 Astra →
98
Fugu Ultra v2
Sakana AI · $5/$30 per 1M tokens — Score 97/100
97
Kimi K3.1 Pro
Moonshot AI · Free – API · free tier — Has a free tier
95
Muse Wonder 1.0
Meta · $4/$20 per 1M tokens (API) — Score 93/100
93

🔗 Comparisons & guides

Claude Opus 5.5 vs GPT-6 AstraHead-to-head comparison
Claude Opus 5.5 vs Claude Fable 5.2Head-to-head comparison
Claude Opus 5.5 vs Gemini 4 ArgonHead-to-head comparison
Claude Opus 5.5 vs DeepSeek V4.1 FlashHead-to-head comparison
Best AI Chatbot 2026: Top 7 AI Assistants RankedBest-of guide
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❓ Frequently Asked Questions

What is Claude Opus 5.5?

Claude Opus 5.5 is Anthropic’s flagship model and currently the highest-ranked publicly available model on the Artificial Analysis Intelligence Index. It is available on the Claude Pro plan and via API with a 1M-token context.

What is Claude Opus 5.5 best for?

Claude Opus 5.5 is a strong pick for: Agentic coding and large refactors; Complex analysis and long documents; Claude Pro subscribers who want the top model.

How does Claude Opus 5.5 perform in benchmarks?

Claude Opus 5.5 scores 59 on the Artificial Analysis Intelligence Index v5.

How much does Claude Opus 5.5 cost?

Claude Opus 5.5 starts at From $20/mo (Pro) ($4/$20 per 1M). There is no free tier. A cheaper option from another provider is Gemini 4 Carbon ($2/$10 per 1M tokens (API, until Nov 30)).

Is Claude Opus 5.5 free?

No, Claude Opus 5.5 has no free tier. Pricing: From $20/mo (Pro) (details: $4/$20 per 1M).

What are the best alternatives to Claude Opus 5.5?

The highest-rated AI chatbots & text models from other providers on AIVerso are Gemini 4 Carbon (98/100), GPT-6 Astra (98/100), Fugu Ultra v2 (97/100).

Does Claude Opus 5.5 have an API?

Yes, Claude Opus 5.5 can be used via an API.

Is Claude Opus 5.5 open source?

No, Claude Opus 5.5 is a closed, proprietary model from Anthropic.

How does AIVerso rate Claude Opus 5.5?

Claude Opus 5.5 scores 98/100 on AIVerso and ranks #3 of 54 in Text & Chat. Scores combine public benchmark results, features and pricing; commissions never influence them.

How we rate: Scores and capability ratings are based on public benchmarks, provider documentation, features and pricing — not on commission rates. Prices can change; check the provider's site before buying. Last updated: November 13, 2026.