OpenAI releases GPT-5.5 as DeepSeek launches V4 model

OpenAI officially released GPT-5.5 on April 23, marking progress in closed-source language models.

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Simultaneously, DeepSeek deployed its V4 version, intensifying competition in open models.

These near-simultaneous releases show accelerating AI development cycles in 2026.

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Auto-synthesis from 2 media sources · identified on April 24, 2026