GPT-5.6 Sol
OpenAI's flagship tier for complex reasoning, coding, and agentic work.
GPT-5.6 Sol specifications
| Provider | OpenAI |
|---|---|
| Context window | 1,050,000 tokens (1.1M) |
| Input price | $4.00 / 1M tokens |
| Output price | $20.00 / 1M tokens |
| Inputs | Text, Images |
| Reasoning mode | Yes |
| Vision (image input) | Yes |
| Tool / function calling | Yes |
| Native real-time web | Yes |
| Open-weight | No |
| Released | July 2026 |
| Knowledge cutoff | February 2026 |
Pricing & context web-verified August 2026 — confirm on OpenAI's pricing page. Flagship tier. Prompts over 272K input tokens bill at 2x input and 1.5x output for the whole request.
What GPT-5.6 Sol is best for
- Complex reasoning and long-horizon coding
- Agentic, multi-step workflows and computer use
- Long-context work up to a 1.05M-token window
- Research, cybersecurity, and knowledge work
How to prompt GPT-5.6 Sol
- Set reasoning effort deliberately — it runs from none through low, medium, high, and xhigh to max, and it is a cost dial as much as a quality one.
- Mechanical work does not improve at high effort. Save the top settings for design, debugging, and migration planning.
- Give it a goal and a tool set, then let it plan and self-verify rather than scripting every step.
- Keep prompts under 272K input tokens where you can — above that, the whole request bills at 2x input and 1.5x output.
Work with GPT-5.6 Sol
- Build an optimized prompt with the OpenAI prompt generator.
- Estimate cost with the token counter & cost calculator, or compare every model on the AI model comparison page.
- Related reading: Best Chatgpt Prompts 2026 · Gpt 5 Coding Prompts · Codex Cli Prompting Guide.
- Official: chatgpt.com
Frequently asked questions
What is GPT-5.6 Sol's context window?
GPT-5.6 Sol has a 1,050,000-token context window (about 1.1M tokens) — the maximum amount of text it can consider at once.
How much does GPT-5.6 Sol cost?
Via the OpenAI API, GPT-5.6 Sol costs $4.00 per 1M input tokens and $20.00 per 1M output tokens (web-verified August 2026). Output tokens cost more, so the length of the model's reply usually drives the bill.
Is GPT-5.6 Sol multimodal?
Yes — GPT-5.6 Sol accepts Text, Images as input, not just text.
Is GPT-5.6 Sol open-weight?
No — GPT-5.6 Sol is available only through the OpenAI API, not as downloadable weights.