GPT-5.6 Sol
A good performance / EU-hosting balance for a European company.
Overview
GPT-5.6 Sol is OpenAI's latest agentic model, built around a 1.05-million-token context window designed to sustain long chains of reasoning and code generation. Its promotional pricing ($4/$20 per million tokens) holds until at least November 21, 2026, before reverting to the standard $5/$30 rate. As with any proprietary OpenAI model, weights remain closed and data runs through the vendor's US infrastructure, with no on-premise or EU-hosted option available.
Skill profile
Not disclosed
Strengths
- World-class on Arena
- Very long context
Who is it for
- your data must stay in the EU
Ideal use cases
- Complex workflow automation
- Multi-step autonomous agents
- Long-context code generation
- 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.
17/20 criteria documented · 85 %
See the criteria▾
Trust Index badge
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[](https://naivigate.com/en/model/gpt-5-6-sol)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 | On request |
| Data processing agreement (DPA) | Yes |
| Transfer outside the EU | Depends on plan |
| Training on your data | No |
| Configurable retention | Yes |
| Zero Data Retention | On request |
| Self-hostable | No |
| Declared hosting | US/EU |
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.
5/6 documented · 4/6 primary sources
Advanced data · for expertsArchitecture, modalities, detailed cost, full benchmarks▾
| Arena Elo | 1483 |
| MMLU | — |
| GPQA | — |
| HumanEval | — |
| SWE-Bench | — |
| MATH | — |