Claude Sonnet 5.5
A versatile model, balanced across most use cases.
Overview
Anthropic's latest Sonnet, built for coding and agentic workflows, with a claimed 1M-token context window (max output capped at 128K). Its AA Intelligence Index score (56.0) tops current generalist benchmarks, but real-world adoption is still marginal (0.6% share on OpenRouter over 30 days), so results should be validated against your own workloads before scaling up. As a proprietary model available only through Anthropic's paid API, data is processed on the vendor's US infrastructure — worth checking contractually (DPA, transfer clauses) for any sensitive European use case.
Skill profile
Not disclosed
Strengths
- Very long context
Limitations
- No documented EU residency
Who is it for
- you handle sensitive data with no EU option
Ideal use cases
- Autonomous coding agents
- Code review and generation
- Long multi-step automation
- Large document analysis
Access & availability
Key specifications
What it costs per month
Estimate from sourced API prices and a hardware tier for self-hosting. Assumptions are editable.
Assumptions: 36-month amortisation, 0.25 €/kWh, 22 days/month, 1 $ = 0.92 €. Excludes labour, software licences, redundancy.
nAIvigate Trust Index
What the vendor offers and documents for professional use in Europe. An undocumented criterion counts as zero and stays visible: the score rises when the vendor publishes, not when we assume.
19/20 criteria documented · 95 %
See the criteria▾
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[](https://naivigate.com/en/model/claude-sonnet-5-5)Data & compliance
What we know, line by line, with source and date. These lines feed the Data and Enterprise families of the Trust Index above. GDPR compliance depends on your processing, not on the model alone.
| EU data residency | No |
| Data processing agreement (DPA) | Yes |
| Transfer outside the EU | Yes |
| Training on your data | No |
| Configurable retention | Yes |
| Zero Data Retention | On request |
| Self-hostable | No |
| Declared hosting | US |
Quality of this card’s data
This score measures the quality of the data on this card: price, context, Elo, licence, documented, sourced and fresh. It measures neither the model nor its compliance: for that, see the Trust Index above.
4/6 documented · 2/6 primary sources
Advanced data · for expertsArchitecture, modalities, detailed cost, full benchmarks▾
| Arena Elo | — |
| MMLU | — |
| GPQA | — |
| HumanEval | — |
| SWE-Bench | — |
| MATH | — |