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 GPT-5.6 SolOpenAI |  DeepSeek-R1DeepSeek | DeepSeek-V4-Flash DeepSeek | |
|---|---|---|---|
| Vendor | OpenAI | DeepSeek | DeepSeek |
| Family | GPT | DeepSeek | DeepSeek |
| Release date | 2026-06-26 | 2025-01-20 | 2026-04-22 |
| Context window | — | 128,000 tokens | 1,000,000 tokens |
| Parameters | — | 671B | 284B (13B active) |
| Modality | text, vision, audio | text | text |
| License | proprietary | MIT | MIT |
| Source | proprietary | open weights | open weights |
| 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. | Reasoning-focused open-weight model. | Smaller, faster sibling to DeepSeek-V4-Pro. Same 1M context window with a much lighter 284B / 13B-active MoE. |
| Links | |||
| Benchmarks | |||
| AIME-25 | — | 79.8% | — |
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GPT-5.6 Sol✓
Claude 4.8 Opus+
Qwen3.7-Max+
Gemini 3.5 Flash+Gemini 3.5+Gemini Omni+GPT-5.5+DeepSeek-V4-Flash✓Gemini 3 Pro+DeepSeek-V4-Pro+Qwen3.6-27B+Claude 4.7 Opus+Claude 4.6 Sonnet+Claude 4.5 Haiku+DeepSeek-V3.1+GPT-5 Pro+GPT-5+
Grok 4+Gemini 2.5 Flash+Qwen3 235B+o3+GPT-4.1+
Llama 4 Scout+Llama 4 Maverick+Gemini 2.5 Pro+DeepSeek-R1✓
Mistral Large 2+