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Claude Sonnet 5.5 🆕 New

by Anthropic · Text & Chat · Code

Free on claude.ai · #2 on the AA Intelligence Index (56) · Terminal-Bench 4.0 70.6% · 30%+ faster than Sonnet 5 · $2/$10 per 1M.

97/100AIVerso score
#5 of 49in Text & Chat
Free – $20/mo (Pro)Starting price
YesFree tier
🔗 Try Claude Sonnet 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 priceFree – $20/mo (Pro)
Pricing details$2/$10 per 1M (API)
Free tierYes
API accessYes
Open sourceNo
Context window1M tokens
Mobile appiOS & Android

Key facts

Capability ratings

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

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-tier AIVerso score (97/100)
Free tier available
Large 1M token context window
Built-in web search
API access for developers
iOS & Android apps

Limitations

Closed model — cannot be self-hosted

Best alternatives to Claude Sonnet 5.5

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OpenAI · From $20/mo (Plus) — Higher score (98 vs 97)
98
Fugu Ultra v2
Sakana AI · $5/$30 per 1M tokens — Score 97/100
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Gemini 3.1 Pro
Google · Free – $20/mo · free tier — Score 96/100
96
MiMo-V2.6-Pro
Xiaomi · Free (open weights) · $0.44/$0.87 per 1M · free tier — Lower API price (Free (open weights) · $0.44/$0.87 per 1M vs $2/$10 per 1M (API))
96
Kimi K3
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🔗 Comparisons & guides

Claude Sonnet 5.5 vs GPT-6.1 SolHead-to-head comparison
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❓ Frequently Asked Questions

Is Claude Sonnet 5.5 free?

Yes — Claude Sonnet 5.5 has a free tier. Pricing: Free – $20/mo (Pro) (details: $2/$10 per 1M (API)).

What are the best alternatives to Claude Sonnet 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 Sonnet 5.5 have an API?

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

Is Claude Sonnet 5.5 open source?

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

How does AIVerso rate Claude Sonnet 5.5?

Claude Sonnet 5.5 scores 97/100 on AIVerso and ranks #5 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: October 2, 2026.