GPT-5 released

OpenAI's GPT-5 unifies fast and reasoning modes, posting 74.9% on SWE-bench Verified and lower hallucination rates.

What happened and why it matters

GPT-5 was an important consolidation rather than a GPT-4-style leap; reception was mixed, with many noting incremental gains. It did make frontier reasoning the default for hundreds of millions of users.

Sources

• Introducing GPT-5 ↗ OpenAI · 7 Aug 2025