Stealth Model Watch
Archive snapshot · Updated September 30, 2026
GPT-6.1 Sol — Launch Tracker
GPT-6.1 Sol is OpenAI's newest Sol-line model, live as of September 30, 2026. This archive tracks confirmed rollout facts and separately flags everything that is still unconfirmed.
Confirmed facts
Verified rollout information
Sources marked as fact are confirmed by official OpenAI documentation at archive time.
- Model ID
- GPT-6.1 Sol
- Developer
- OpenAI
- Launched
- September 30, 2026, per ChatGPT's official release notes source ↗
- Lineage
- Successor to GPT-6 Sol and GPT-6 Luna, which launched September 22, 2026 for ChatGPT Work and Codex source ↗
- Positioning
- Positioned for complex work — coding and professional tasks at lower cost, per the release notes source ↗
Unconfirmed reports
Inference tier (not yet verified)
These reports lack official confirmation from OpenAI and are treated as speculation.
Unconfirmed reports (inference tier)
- Leak tracker TestingCatalog reported an "Ultrafast" premium speed tier and a ChatGPT Pro 500 plan with 25x usage capacity around the same rollout window. source ↗
Direct answers
GPT-6.1 Sol FAQ
Short answers that preserve the same evidence boundaries as the facts above.
What is GPT-6.1 Sol?
It is OpenAI's latest Sol-line model, launched September 30, 2026 and available across paid ChatGPT plans and Codex per the official release notes.
How is it different from GPT-6 Sol?
GPT-6 Sol launched on September 22, 2026. GPT-6.1 Sol is the next point release, positioned for complex coding and professional work at lower cost. Detailed benchmark deltas were not published at archive time.
Is GPT-6.1 Sol free?
Not confirmed. It is included with paid ChatGPT plans per the rollout notes; API pricing was not published at archive time.
What is "Ultrafast"?
A premium speed tier reported by TestingCatalog alongside the GPT-6.1 Sol rollout. OpenAI has not confirmed it, so it is treated as an unconfirmed report here.