OpenAIvo3 Pro / GPT-4.1 turbo

20 January 2026

OpenAI o3 Pro and GPT-4.1 Updates — January 2026

OpenAI begins 2026 with o3 Pro (highest-accuracy reasoning model, unlimited thinking budget) and GPT-4.1 turbo (50% lower latency, 30% cheaper than original GPT-4.1) — pushing the practical frontier for both deep reasoning and production throughput.

• 1o3 Pro — removes the thinking token budget cap; model reasons as long as needed; best scores on GPQA Diamond (PhD-level science) and AIME 2025 of any available model
• 2GPT-4.1 turbo — same capability as GPT-4.1, 50% lower latency, 30% cost reduction; replaces gpt-4.1 as the recommended default
• 3Operator and Agent patterns GA in the Responses API — built-in orchestration for hand-offs between specialised agents
• 4Deep Research API (beta) — multi-step web research agent accessible via API, same technology powering ChatGPT Deep Research
• 5Real-time voice API WebRTC support — lower-latency alternative to WebSocket for voice agents
• 6Predicted outputs for code generation — specify the expected output format to reduce time-to-complete by up to 60%
• 7Organization-level usage controls — set model, token, and cost budgets per project via API