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Claude Opus 5.5 🆕 New

by Anthropic · Text & Chat · Code

Fable-class coding for less · #1 SWE-bench Pro (89.9%) · #1 Terminal-Bench 4.0 (66.4%) · $4/$20 per 1M · 1M context.

99/100AIVerso score
#2 of 49in Text & Chat
From $20/mo (Pro)Starting price
NoFree tier
🔗 Try Claude Opus 5.5 →Compare with alternatives →

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

At a glance

ProviderAnthropic
CategoryText & Chat, Code
Starting priceFrom $20/mo (Pro)
Pricing details$4/$20 per 1M
Free tierNo
API accessYes
Open sourceNo
Context window1M tokens
Mobile appiOS & Android

Key facts

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 49 AI chatbots & text models on AIVerso (#2)
Top-tier AIVerso score (99/100)
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

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
Gemini 3.1 Pro
Google · Free – $20/mo · free tier — Has a free tier
Claude Opus 5.5 vs Gemini 3.1 Pro →
96
MiMo-V2.6-Pro
Xiaomi · Free (open weights) · $0.44/$0.87 per 1M · free tier — Has a free tier
96
Kimi K3
Moonshot AI · Free – API · free tier — Has a free tier
96

🔗 Comparisons & guides

Claude Opus 5.5 vs GPT-6 AstraHead-to-head comparison
Claude Opus 5.5 vs Claude Fable 5.1Head-to-head comparison
Claude Opus 5.5 vs Gemini 3.1 ProHead-to-head comparison
Claude Opus 5.5 vs DeepSeek V4-ProHead-to-head comparison
Best AI Chatbot 2026: Top 7 AI Assistants RankedBest-of guide
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❓ Frequently Asked Questions

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 GPT-6 Astra (98/100), Fugu Ultra v2 (97/100), Gemini 3.1 Pro (96/100).

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 99/100 on AIVerso and ranks #2 of 49 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: September 29, 2026.