o3-pro

Claims and evidence

• Announced 16 April 2025The o3 and o4-mini announcement said o3-pro would follow in a few weeks with full tool support. ● Primary source[1]Access
• Released 10 June 2025 ● Primary source[1]update note of June 10, 2025 [2]Jun 10, 2025
• Deprecated 11 June 2026 ● Primary source[4]2026-06-11: GPT-5 and o3 model deprecations

• Status Deprecated ● Primary source[4]2026-06-11: GPT-5 and o3 model deprecations
• Replaced by GPT-5.6 SolThe deprecations page recommends gpt-5.6-sol with reasoning.mode pro for o3-pro-2025-06-10. ● Primary source[4]2026-06-11: GPT-5 and o3 model deprecations

• Variant of o3OpenAI describes o3-pro as a version of o3 that uses more compute to think longer. ● Primary source[1]update note of June 10, 2025 [2]Jun 10, 2025 [3]introduction

• Change · Reasoning Uses more compute than o3 to think longer before answering; the docs say some requests can take several minutes.Compared with o3 ● Primary source[3] [2]
• Change · Availability Limited to ChatGPT Pro users and, according to the docs, the Responses API.Compared with o3 ● Primary source[3] [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 appChatGPT Pro users and the API; the docs say the Responses API only, while the changelog entry also tags the Batch API. ● Primary source[1]update note of June 10, 2025 [3]introduction

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