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Timeline
GPT-5.2 Pro2026-04-29
GPT-5.5 Pro shows significant leap on Epoch benchmark; base GPT-5.5 surpasses GPT-5.4 Pro
Claude Opus 4.62026-04-24
Exhibited similar preferences for self-preservation and resistance without any fine-tuning.
GPT-5.2 Pro2026-04-23
Ethan Mollick shares early impressions of GPT-5.5 Pro, calling it the best model for hard problems.
Claude Opus 4.62026-04-23
Achieved top score of 94.1% on ThermoQA benchmark.
GPT-5.2 Pro2026-04-19
OpenAI insider describes GPT-5.5 Pro as 'qualitative leap' and 'absolutely insane'
GPT-5.2 Pro2026-04-19
Reported to generate complex, high-quality SVG code from a single prompt
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
Claude Opus 4.62026-04-16
Claude Opus 4.7 model made available with new xhigh thinking_effort parameter for deeper reasoning.
Claude Opus 4.62026-04-15
Rumored imminent release of Anthropic's Claude Opus 4.7 model.
Ecosystem
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
GPT-5.2 Pro
deploysChain-of-Thought Prompting1 src
deploysInstruction Tuning (FLAN)1 src
deploysReinforcement Learning from Human Feedback (RLHF)1 src
deploysTransformer Self-Attention1 src