GPT-5.6 Sol
A versatile model, balanced across most use cases.
Overview
GPT-5.6 Sol is the top tier of the GPT-5.6 family, announced as a limited preview on June 26 2026 and made generally available July 9. OpenAI drops the single-model-with-a-dial approach for three distinct tiers: Sol (frontier), Terra (balanced), Luna (volume). 1.05M-token context, 128K max output, $5/$30 per million tokens. It leads Terminal-Bench 2.1 at 88.8% base and 91.9% in Ultra mode. Cost warning: requests above 272,000 input tokens are billed at double the input rate and 1.5x the output rate for the entire request. The gpt-5.6 alias routes to gpt-5.6-sol.
Skill profile
Not disclosed
Strengths
- World-class on Arena
- Very long context
Limitations
- High output cost
- No native GDPR guarantee
Who is it for
- your budget is tight
- you handle sensitive EU data
Access & availability
Key specifications
Estimate your monthly cost
Per-token API pricingFor the same usage
- Muse Spark 1.1$68-81%
- Claude Opus 5$327-10%
- Claude Fable 5$654+80%
Indicative estimate based on standard API rates (excluding caching, batch and volume discounts). Always check the official pricing before committing.
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Advanced data · for expertsArchitecture, modalities, detailed cost, full benchmarks▾
| Arena Elo | 1483 |
| MMLU | — |
| GPQA | — |
| HumanEval | — |
| SWE-Bench | — |
| MATH | — |