# Sol Pro

> **TL;DR.** GPT-5.

- **Category:** AI / Frontier Models / OpenAI
- **Stage:** emergent
- **Age:** 25 days
- **Origin date:** 2026-06-30
- **First detected:** 2026-07-17
- **Canonical URL:** https://earlyterms.com/term/sol-pro
- **Sources:** 7 primary URLs

## Definition

GPT-5.6 Sol Pro is the maximum reasoning-effort mode of OpenAI's flagship GPT-5.6 Sol model, reserved for ChatGPT Pro and Enterprise subscribers who need the deepest, slowest analysis on unusually difficult or long-running tasks, distinct from Sol's cheaper Medium, High, and Extra High settings.

Its name leaked by accident in an OpenAI genomics benchmark table on [June 30, 2026](https://www.techtimes.com/articles/319534/20260702/chatgpt-pro-splitting-three-gpt-56-benchmark-reveals-luna-terra-sol-pro.htm), then OpenAI confirmed Sol Pro as ChatGPT's top reasoning tier at [general availability on July 9, 2026](https://help.openai.com/en/articles/20001354-gpt-56-in-chatgpt). Days later, Wharton statistician Edgar Dobriban used it to disprove a 20-year statistical conjecture in 90 minutes, work GPT-5.5 had failed at after 20+ hours.

## Analogy

Like paying extra for a specialist's full afternoon instead of the general practitioner's ten-minute slot — same doctor, more time devoted to your hardest case.

## Why it's emerging now

GPT-5.6 Sol Pro's name leaked in an OpenAI benchmark table on June 30, 2026, weeks before OpenAI confirmed it as ChatGPT's top reasoning tier at general availability on July 9. Within days, Wharton's Edgar Dobriban used it to disprove a 20-year statistical conjecture in 90 minutes, and a Berkeley professor formally verified a 1996 optimization bound.

## Related terms

- *parent:* GPT-5.6 Sol
- *related:* Sol Ultra
- *related:* GPT-5.5
- *competitor:* Claude Fable 5
- *competitor:* Claude Opus 4.7
- *competitor:* Grok 4.5
- *competitor:* Gemini 3.1 Pro
- *competitor:* DeepSeek V4
- *related:* o1 Pro Mode

## Sources

1. [OpenAI Help Center — GPT-5.6 in ChatGPT (Sol Pro reasoning tier)](https://help.openai.com/en/articles/20001354-gpt-56-in-chatgpt)
2. [Tech Times — ChatGPT Pro Splitting Into Three: GPT-5.6 Benchmark Reveals Luna, Terra, Sol Pro](https://www.techtimes.com/articles/319534/20260702/chatgpt-pro-splitting-three-gpt-56-benchmark-reveals-luna-terra-sol-pro.htm)
3. [The Decoder — GPT-5.6 Sol Pro Disproves 30-Year-Old Statistics Conjecture](https://the-decoder.com/gpt-5-6-sol-reportedly-disproves-a-30-year-old-statistics-conjecture-in-90-minutes-after-humans-couldnt-crack-it/)
4. [Phillip Kerger — An AI-Assisted Breakthrough in Convex Optimization](https://medium.com/@kerger.p/an-ai-assisted-breakthrough-in-convex-optimization-an-optimization-problem-dating-back-30-years-a-db5c631119de)
5. [Hacker News — GPT-5.6 Sol Pro Solves Open Problem in Convex Optimization](https://news.ycombinator.com/item?id=48939768)
6. [OpenRouter — GPT-5.6 Sol Pro API Pricing & Providers](https://openrouter.ai/openai/gpt-5.6-sol-pro)
7. [ToolColumn — GPT-5.6 Sol Pro vs Max: What Actually Changes?](https://www.toolcolumn.com/learn/gpt-5-6-sol-pro-vs-max)

---
_Generated by EarlyTerms · https://earlyterms.com/term/sol-pro_