GPT-6.1

GPT-6.1
DeveloperOpenAI
ReleaseSeptember 29, 2026; 30 days ago (2026-09-29) (Sol)
October 26, 2026; 3 days ago (2026-10-26) (Terra)
PredecessorGPT-6
TypeLarge language model
LicenseProprietary
Websiteopenai.com/index/introducing-gpt-6-1-sol

GPT-6.1 Sol and Terra are a large language model family (LLM) released by OpenAI on September 29, 2026.

History

GPT-6.1 Sol was released on September 29, 2026, during OpenAI's DevDay event. Some[who?] expected that GPT-6.1 Astra would also be announced that day, but the announcement was reportedly canceled due to alignment issues.

GPT-6.1 Terra was released on October 26, 2026.

On October 28, 2026, Days following the launch of GPT 6.1 Terra, Pankaj Kumar from X (formerly Twitter) posted that the prototype of GPT-6.1 Luna was available only on Arena.ai as "Fe-pichu", meaning "Allocation - Granting" in Chinese. The GPT-6.1 Luna prototype will be capable granting allocation across all of its current language models. It uses OpenAI's tokenizer, which makes it more likely to be an OpenAI model.

Safety

Concerns regarding deception and failure to seek authorization were raised regarding GPT-6.1 Astra by some who had used it. In statements to the press following the publication of these concerns, OpenAI head of safety systems Saachi Jain stated GPT-6.1 Astra "didn’t quite meet the bar" in regard to safety.

References

  1. ↑ "Introducing GPT-6.1 Sol". OpenAI. 2026-09-22. Retrieved 2026-09-30.
  2. ↑ Viswanathan, Pradeep (2026-09-29). "OpenAI launches GPT-6.1 Sol with near-Astra performance at one-fifth the price". Neowin. Retrieved 2026-09-29.
  3. ↑ Malik, Aisha (2026-09-29). "OpenAI launches GPT-6.1 Sol, says it nearly matches GPT-6 Astra and costs less". TechCrunch. Retrieved 2026-09-29.
  4. 1 2 Pearl, Mike (2026-09-29). "OpenAI Cancels Release of GPT-6.1 Astra Because It 'Regressed' on Safety". Gizmodo. Retrieved 2026-09-29.
  5. ↑ "Introducting GPT-6.1 Terra". OpenAI. 2026-10-26. Retrieved 2026-10-26.
  6. ↑ "GPT-6.1 Luna coming today?". X (formerly Twitter). 2026-10-28. Retrieved 2026-10-28.
  7. ↑ "OpenAI delays latest model over security concerns, as industry faces new safety pressures". Associated Press. 2026-09-28. Retrieved 2026-09-29.