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OpenAI GPT Model Release Timeline - Model Lineage, ChatGPT and Codex Milestones, and Platform Availability | hidekazu-konishi.com

hidekazu-konishi.com · published 19 June 2026

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GPT-4 Read at the source ↗
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Introducing gpt-realtime and Realtime API updates Read at the source ↗
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OpenAI GPT-6 Astra is now generally available on Amazon Bedrock Read at the source ↗
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OpenAI GPT-6 Sol and GPT-6 Luna are now generally available on Amazon Bedrock  Read at the source ↗
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Retiring GPT-4o, GPT-4.1, GPT-4.1 mini, and OpenAI o4-mini in ChatGPT Read at the source ↗
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