GPT-5.6 Sol
OpenAI’s flagship from July 2026, kept for long coding work built on it.
About GPT-5.6 Sol
GPT-5.6 Sol led OpenAI’s line from July 2026 until GPT-6 arrived in September. OpenAI positioned it as its strongest model for coding, science and security at the time, and it still holds one of the better coding scores here: 72.7% on DeepSWE, higher than the GPT-6 Sol that replaced it.
Its reasoning runs from none to max. Reviewers found it more willing than earlier GPTs to go beyond what it was asked, which suits long agent tasks and needs watching in anything customer-facing. Newer GPT-6 models now do most of the same work for less.
Where it’s strong
Long coding tasks that need planning and follow-through.
Security research.
Products validated on GPT-5.6 that should not change model.
Where to be careful
Can act beyond what you asked. Keep a person or a check in the loop for actions that matter.
Slow to start at high effort: one independent measurement put the wait before the first word at over two minutes.
Its knowledge stops in February 2026, and the GPT-6 models have overtaken it.
Price
For scale: 1,000 requests of about 3,000 tokens in and 1,000 out cost $36.80 — a long prompt and a page of answer each. Every rate is published and stays the same from one request to the next. See every model.
Specs
gpt-5.6-solCall it
Use the OpenAI SDK you already have — point it at Roar AI and name the model. Read the docs.
from openai import OpenAI
client = OpenAI(base_url="https://api.roar-ai.com/v1", api_key="roar_live_…")
reply = client.chat.completions.create(
model="gpt-5.6-sol",
messages=[{"role": "user", "content": "Summarise this contract in plain English."}],
)Compare GPT-5.6 Sol
Questions
How much does GPT-5.6 Sol cost?
Input is $4.60 per 1M tokens; output is $23.00 per 1M tokens. For scale, 1,000 requests of about 3,000 tokens in and 1,000 out cost $36.80. The rate is published and does not change from one request to the next.
Can I use GPT-5.6 Sol alongside other models?
Yes. Every model on Roar AI is on the same API key and the same monthly invoice, so switching from GPT-5.6 Sol to another model is a change to one word in your code.
Is GPT-5.6 Sol open source?
No. OpenAI does not publish the weights, so it is only available through an API like this one.