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Timeline
GPT-3.52026-04-24
Early user review of GPT-5.5 in Codex highlights major improvements
Claude Opus 4.72026-04-23
Opus 4.7 released with new tokenizer causing 40%+ cost increase
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
GPT-5.5 spotted via Codex API backdoor, suggesting unofficial release channel for image generation.
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
Ethan Mollick announces early access to GPT-5.5, praises the Pro version, full writeup forthcoming.
GPT-3.52026-04-23
OpenAI announces GPT-5.5 as a new intelligence tier for agents and tool use
Claude Opus 4.72026-04-20
Anthropic released Claude Opus 4.7 with an updated tokenizer that increases token counts for the same input
Claude Opus 4.72026-04-20
Released Claude Opus 4.7 with 87.6% on SWE-Bench
Ecosystem
Claude Opus 4.7
deploysChain-of-Thought Prompting1 src
deploysConstitutional AI1 src
deploysRotary Position Embedding (RoPE)1 src
deploysTest-Time Compute Scaling1 src
deploysTransformer Self-Attention1 src
competes withGPT-5.31 src
GPT-3.5
competes withMicrosoft Excel1 src
competes withClaude 3.5 Opus1 src
competes withClaude Opus 4.71 src
competes withGemini 3 Pro1 src
competes withGPT-5.31 src
competes withArtificial Analysis1 src