OpenAI launches GPT-5
Confirmed
Importance: historic (5 of 5)The takeaway
GPT-5 unified OpenAI’s fast and reasoning models into one system with a real-time router, becoming the default ChatGPT model for all users with state-of-the-art results in coding, math and health, and reduced hallucinations.
Status
- Claim
Confirmed
- Our reporting
- High confidence
- Importance
- Historic (5 of 5)
- Last verified
- 29 September 2026
Your AI and this story
- GPT-6 AstraIn its training data
- Claude Opus 5.5In its training data
- Gemini 4 HydrogenIn its training data
- Grok 4.7In its training data
It happened before the cutoffs of all four assistants, so it can be in their training data.
Key facts
- Released 7 August 2025 to all ChatGPT users, including free tier
- SWE-bench Verified: 74.9%, per OpenAI
- AIME 2025 (no tools): 94.6%, per OpenAI
- Unified system: fast model + GPT-5 thinking + router
- API family: gpt-5, gpt-5-mini, gpt-5-nano; followed by GPT-5.1 (November) and GPT-5.2 (December 2025)
What happened
After over two years of anticipation, OpenAI shipped GPT-5; reception mixed praise for capability with complaints over the removal of older models, which were partly restored.
Why it matters
Brought reasoning-model capability to hundreds of millions of free users by default.
Sources
2 sources from 1 site. Numbers match the chips in the text.
2 sources: 2 primary
Primary
- Introducing GPT-5 (OpenAI)openai.com, official
- GPT-5 System Card (OpenAI)openai.com, docs
Changes
- Filed