Latest
  1. Johns Hopkins Bayview tells 3,182 patients an employee put their health data into a public AI tool
  2. China’s AI compute access expected to double in 2027, with US-designed chips about 65 per cent
  3. UK commits £100m to national AI Biosecurity Lab
  4. Moonshot AI releases Kimi K3.1 Pro with 1-million-token context window
  5. Residents in Newport and Cardiff oppose hyperscale datacentres near homes
  6. Study: Grok 4.7 picked Republicans in 92% of forced midterm answers, GPT-6.1 Sol picked Democrats in 97%
  7. Attackers exploiting the PHP flaws hand the break-in to AI agents, Unit 42 says
  8. Elvis Presley’s rightsholders sue Anthropic over training on 274 songs

Latest / Frontier models and safety

Model releaseFrontierUSConfirmed

OpenAI releases o1-preview, a model trained to reason step by step before answering

See how this story connects

Source: OpenAIAlso reported by OpenAI (o1-preview launch)

OpenAI released o1-preview on 12 September 2024 in ChatGPT and to trusted API users. OpenAI reported that the full o1 model, trained with reinforcement learning to work through a chain of thought, solved 74% of AIME 2024 problems with one sample against 12% for GPT-4o, reached the 89th percentile on Codeforces, and was the first model to beat its PhD-expert baseline on GPQA Diamond. It said accuracy rose both with more reinforcement learning and with more time spent thinking at inference.

Why it matters

OpenAI showed that accuracy rose with more computing time spent on each answer, so labs and developers could get better results at inference as well as from larger training runs.

When
12 Sep 2024
ID
WTA-N-2024-0045
Who
OpenAI

Summary by wheresthe.ai, from OpenAI and the reporting credited above. Checked against the source on 9 Oct 2026.

Read the original at OpenAI

Source copy: download the page text as saved on 18 Oct 2026 (PDF). Also held by the Internet Archive.

Cite this story

WTA-N-2024-0045: “OpenAI releases o1-preview, a model trained to reason step by step before answering.” wheresthe.ai, 12 Sep 2024. https://wheresthe.ai/d/openai-o1-preview-reasoning-2024-09/ (source: OpenAI).

Spotted an error? Email [email protected].