GPT-5.6 Sol vs GPT-5 Pro
Direct spec comparison of GPT-5.6 Sol (from OpenAI) and GPT-5 Pro (from OpenAI). Want a 3- or 4-way comparison? Open the multi-model tool →
 GPT-5.6 SolOpenAI | GPT-5 Pro OpenAI | |
|---|---|---|
| Vendor | OpenAI | OpenAI |
| Family | GPT | GPT |
| Release date | 2026-06-26 | 2025-08-07 |
| Context window | — | 400,000 tokens |
| Parameters | — | — |
| Modality | text, vision, audio | text, vision, audio |
| License | proprietary | proprietary |
| Source | proprietary | proprietary |
| Description | Flagship of OpenAI's GPT-5.6 three-model suite (Sol / Terra / Luna), released as a limited preview. Strong gains in coding, cybersecurity, biology, and long-horizon agentic work. Pricing: $5 / $30 per million input/output tokens. | Higher-reasoning variant of GPT-5, used for harder scientific and research tasks (e.g., immunology breakthroughs at NIH). Same 400K context as GPT-5; trades latency for depth. |
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