OpenAI is retiring several of its older AI models, including GPT-4.5 and o3, with GPT-4.5 being removed from ChatGPT on June 27, 2026. This move is seen as a strategic shift ahead of potential IPO plans and the release of newer models like GPT-5.5 Instant. Concurrently, Anthropic's Claude Opus 4.8 has emerged as the top-performing AI model, achieving a score of 61.4 on the Artificial Analysis Intelligence Index and outperforming GPT-5.5 on the SWE-Bench benchmark. AI
IMPACT Anthropic's Claude Opus 4.8 sets a new benchmark for AI performance, potentially pressuring OpenAI to accelerate its own model development and release strategy.
RANK_REASON Model release and retirement news from major AI labs, with performance benchmarks. [lever_c_demoted from significant: ic=1 ai=1.0]
Read on dev.to — Anthropic tag →
- Anthropic
- Artificial Analysis Intelligence Index
- ChatGPT
- Claude Fable 5
- Claude Opus 4.8
- GPT-4.5
- GPT-5.5 Instant
- o3
- OpenAI
- SWE-Bench
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