o3

Claims and evidence

• Announced 20 December 2024 ● Primary source[2]video description
• Released 16 April 2025 ● Primary source[1]page date; introduction [4]Apr 16, 2025 [5]cover date
• Deprecated 11 June 2026 ● Primary source[6]2026-06-11: GPT-5 and o3 model deprecations

• Status Deprecated ● Primary source[6]2026-06-11: GPT-5 and o3 model deprecations
• Replaced by GPT-5.6 SolRecommended replacement for o3-2025-04-16 on the deprecations page when read on 2026-10-01. ● Primary source[6]2026-06-11: GPT-5 and o3 model deprecations

• Successor of o1The announcement names o1 as the predecessor of o3, and o3 replaced o1 in the ChatGPT model selector. ● Primary source[1]Advancing cost-efficient reasoning; Access

• Change · Tool use Can use and combine all ChatGPT tools, such as web search and Python, within its reasoning, and decides itself when to call them.Compared with o1 ● Primary source[1]
• Change · Reasoning Can work with images inside its chain of thought, for example by rotating or zooming them.Compared with o1 ● Primary source[1]
• Change · Efficiency OpenAI says o3 is often more efficient than o1 and improves on o1's balance of cost and performance.Compared with o1 ● Primary source[1]
• Change · Safety Safety training data was rebuilt, with new refusal prompts for areas such as biological threats, malware generation and jailbreaks.Compared with o1 ● Primary source[1]

• Input text, image ● Primary source[3]Model details
• Output text ● Primary source[3]Model details
• Context window 200,000 tokens ● Primary source[3]Model details
• Parameters Not disclosedNot disclosed by OpenAI. No claim madeNo source
• Access API, consumer app ● Primary source[1]Access

Lineage

Variants

No variants recorded in this record.

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