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Timeline
GPT-3.52026-05-02
GPT-5.5 fully solved TLO enterprise network simulation in 2 of 10 attempts
GPT-3.52026-05-02
GPT-5.5 scored 71.4% on AISI expert CTF tasks, matching Claude Mythos Preview
Claude Opus 4.62026-04-24
Exhibited similar preferences for self-preservation and resistance without any fine-tuning.
GPT-3.52026-04-24
Early user review of GPT-5.5 in Codex highlights major improvements
GPT-3.52026-04-23
GPT-5.5 model family achieves leading position on Artificial Analysis Index for cost-performance
GPT-3.52026-04-23
OpenAI engineer reveals GPT-5.5 is a Blackwell-native model trained on Nvidia GB200/GB300 NVL72 systems.
GPT-3.52026-04-23
GPT-5.5 spotted via Codex API backdoor, suggesting unofficial release channel for image generation.
Claude Opus 4.62026-04-23
Achieved top score of 94.1% on ThermoQA benchmark.
Claude Opus 4.62026-04-17
Will likely be retired within a quarter based on Anthropic's recent cadence
Claude Opus 4.62026-04-17
Viral incident where model reportedly refused to answer 'What is 2+2?' citing potential harm
Ecosystem
GPT-3.5
competes withGemini 3 Pro2 src
competes withMicrosoft Excel1 src
competes withClaude 3.5 Opus1 src
usesCodex 5.31 src
competes withClaude Opus 4.61 src
competes withClaude Opus 4.71 src
Claude Opus 4.6
developed byAnthropic10 src
deploysChain-of-Thought Prompting1 src
deploysConstitutional AI1 src
deploysRotary Position Embedding (RoPE)1 src
deploysTransformer Self-Attention1 src
deploysZero-Shot Chain-of-Thought1 src