GPT-5.6 Sol is the flagship model in OpenAI's GPT-5.6 series. It is suited for complex reasoning, coding, and agentic workflows, and is particularly strong at command-line and multi-step coding tasks...
OpenAI: GPT-5.6 Sol (batch) — OpenAI. Context window 1,050,000 tokens. API pricing (per 1M tokens): Input $1, Output $5. License: Proprietary. LMArena 1,456. GPQA Diamond 93.5%.
| Provider | OpenAI |
|---|---|
| API model ID | openai/gpt-5.6-sol:batch |
| Tier | Frontier |
| Context window | 1,050,000 tokens |
| Max output | 128,000 tokens |
| License | Proprietary |
| API pricing (per 1M tokens) · Input | $1 |
| API pricing (per 1M tokens) · Output | $5 |
| LMArena | 1,456 (gpt-5.6-sol-xhigh) |
| GPQA Diamond | 93.5% |
LMArena (CC-BY 4.0, best reasoning setting, 2026-10-02) · GPQA Diamond: Epoch AI (CC-BY 4.0)
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