OpenAI has announced the retirement of GPT-4.5 from ChatGPT, effective June 27, 2026, marking one of the most aggressive model retirements in its history. Following this, the o3 model will also be retired on August 26. The transition to GPT-5.5 Instant is underway, which is positioned as a faster and more efficient replacement. In the competitive AI landscape, Anthropic's Claude Opus 4.8 has emerged as the leading model, achieving a score of 61.4 on the Artificial Analysis Intelligence Index, surpassing GPT-5.5's score of 82.6% on SWE-Bench. As OpenAI shifts its strategy ahead of a potential IPO, the AI domain welcomes a new leader in Claude Opus 4.8, which has set a high bar for performance.
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OpenAI Retires GPT-4.5 as Anthropic's Claude Opus 4.8 Takes the Crown in AI Rankings
Dev.to· DoremonAI· Tuesday, June 23, 2026
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