GPT-5.6 Sol Pro
Current version: 5.6 updated
GPT-5.6 flagship with pro reasoning mode for complex tasks.
What's new in GPT-5.6 Sol Pro 5.6
- 1.05M token context
- GPT-5.6 flagship with reasoning.mode pro
- Higher quality on complex tasks than base Sol
- Same price as Sol: 5 USD input, 30 USD output per million tokens
What it's the best tool for
- Same GPT-5.6 Sol weights served with reasoning.mode=pro
- 1.05M-token context window, output up to 128K
- Top agentic tier: 53.6 on Agents' Last Exam for the Sol line
- Reliable tool calling plus image input
- Same per-token list price as regular Sol
When to reach for something else
- Noticeably slower than regular Sol on every request
- Answers burn more reasoning tokens, so the real bill is higher
- Knowledge cutoff February 2026, no built-in web search
- Overkill for casual chat — pick Luna instead
- Sol line trails Claude Fable 5 on SWE-Bench Pro (a contested benchmark)
How GPT-5.6 Sol Pro responds
GPT-5.6 Sol Pro
Four scenarios where it pays for itself
More about GPT-5.6 Sol Pro
GPT-5.6 Sol Pro Online — OpenAI's Pro Reasoning Flagship on NetRoom
GPT-5.6 Sol Pro is the same model as GPT-5.6 Sol, served with reasoning.mode=pro: it spends more compute on a single final answer and makes noticeably fewer mistakes on hard problems. The GPT-5.6 family (Sol, Terra, Luna) shipped on July 9, 2026; Sol is the top tier with a 1.05M-token context window and up to 128K output tokens. Access it on NetRoom with no VPN and no extra setup.
What pro mode changes
Pro is not a separate model — it is a serving mode. The same network thinks longer and deeper before it answers, which translates into more accurate results in math, debugging and multi-step planning, exactly where regular Sol sometimes cuts corners for speed. The per-token list price stays the same as regular Sol; you only pay more through longer reasoning chains. When the cost of a wrong answer beats the cost of tokens, that is a fair trade.
What you get
The Sol line is OpenAI's strongest agentic model: 53.6 on Agents' Last Exam, more than 13 points ahead of Claude Fable 5. Reliable tool calling, image input, several reasoning-effort levels on top of pro mode, and a knowledge cutoff of February 2026. Per million tokens it comes out roughly half the price of rival flagships — and on NetRoom you get it in the browser with simple balance top-ups.
Best fit
Heavy refactoring and debugging, legal and financial review of long documents, deep research, and agent pipelines where one wrong step costs more than the whole session. For quick chat and drafts, pick GPT-5.6 Luna — it is several times cheaper and answers instantly, while Sol Pro stays reserved for work that demands maximum quality.
How to start
Sign up on NetRoom, top up your balance, pick GPT-5.6 Sol Pro from the model list and start prompting — pro-grade reasoning straight from the browser, no API keys required.
What changed GPT-5.6 Sol Pro
- + Added text model GPT-5.6 Sol Pro (OpenAI).
Version history of GPT-5.6 Sol Pro
| Version | Date | What changed |
|---|---|---|
| 5.6 current |
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