GPT-5.6 Sol (Reasoning)
by OpenAI
GPT-5.6 Sol (Reasoning) is a reasoning model from OpenAI, released on July 9, 2026. It has a 1.1M-token context window and can generate up to 128K output tokens. API pricing is $5 per 1M input tokens and $30 per 1M output tokens.
GPT-5.6 Sol is the frontier model in OpenAI's GPT-5.6 family, designed for complex professional work across coding, knowledge work, cybersecurity, and science. It sets state-of-the-art results while using fewer tokens at lower estimated cost, supports max reasoning effort and an ultra multi-agent mode, and has a 1.05M-token context window. The gpt-5.6 alias routes to GPT-5.6 Sol.
Key specs
| Provider | OpenAI |
|---|---|
| Release date | 2026-07-09 |
| License | proprietary |
| Context window | 1.1M tokens |
| Max output | 128K tokens |
| Input price | $5 / 1M tokens |
| Output price | $30 / 1M tokens |
| Intelligence Score | 53.5 |
| Coding index | 43.7 |
| Output speed | 53 tokens/s |
| Time to first token | 3.00 s |
Quick answers
What is the context window of GPT-5.6 Sol (Reasoning)?
GPT-5.6 Sol (Reasoning) has a context window of 1.1M tokens, with a maximum output of 128K tokens per response.
How much does GPT-5.6 Sol (Reasoning) cost?
GPT-5.6 Sol (Reasoning) costs $5 per 1M input tokens and $30 per 1M output tokens through the API.
Is GPT-5.6 Sol (Reasoning) open source?
No. GPT-5.6 Sol (Reasoning) is a proprietary model from OpenAI (proprietary license).
When was GPT-5.6 Sol (Reasoning) released?
OpenAI released GPT-5.6 Sol (Reasoning) on July 9, 2026.
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