OpenAI launches GPT-4.5 with three variants following review
OpenAI has launched GPT-4.5 featuring the model variants Sol, Terra, and Luna on 9 July 2026, following a delay caused by a US government safety review.
What happened?
OpenAI launched its new flagship model, GPT-4.5, on 9 July 2026. The release includes three distinct variants: Sol, Terra, and Luna. This occurred after a national security review by the US government had delayed the release.
Key facts
| Lanseringsdatum | 9 juli 2026 |
|---|---|
| Modellnamn | GPT-4.5 (Sol, Terra, Luna) |
| Antal varianter | 3 |
| Reducerad tokenanvändning (Sol) | 80% färre output-tokens för cybersäkerhet |
”OpenAI released GPT-4.5 on July 9, 2026, introducing three model variants — Sol, Terra, and Luna — following a delay caused by a U.S. government national-security review.”
”The flagship Sol model outperforms Anthropic's Claude Mythos 5 on key benchmarks while using roughly 80% fewer output tokens on cybersecurity tasks.”
Why it matters
The launch of GPT-4.5 and its differentiated variants signals a new strategy from OpenAI, offering optimised models for various use cases — from complex agentic workflows to cost-effective applications. This model family represents OpenAI's latest advancement in large language models.
Who is affected?
Developers and enterprises using OpenAI's APIs are affected as they gain access to new, more capable, and differentiated models. Users of AI applications can expect improved performance and efficiency. Developers working with coding, scientific applications, and cybersecurity are specifically impacted by the Sol model.
Impact on the EU
The GPT-4.5 models are available globally, including within the EU. While the US safety review does not directly impact availability, similar reviews may become relevant in the future under the EU AI Act.
What else you should know
Sol, the flagship model, reportedly outperforms Anthropic Claude Mythos 5 on key benchmarks and uses approximately 80% fewer output tokens for cybersecurity tasks.
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