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Tech · 1 min read27 April 2026

OpenAI Releases GPT-5.5 Six Weeks After GPT-5.4 as Model Cadence Accelerates

OpenAI released GPT-5.5 just six weeks after GPT-5.4, with gains in agentic coding, computer use and multimodal processing across text, images, audio and video.

OpenAI released GPT-5.5 on April 24, its smartest model yet, just six weeks after GPT-5.4, with major gains in agentic coding, computer use and unified multimodal processing.

⚡What happened

GPT-5.5 processes text, images, audio and video in a single architecture, with strong gains in agentic tasks. Available to Plus, Pro, Business and Enterprise users via ChatGPT and Codex.

→Why it matters

Six-week release cycles mean any AI workflow you build today will run on a meaningfully better model within two months, making "wait and see" a losing strategy.

🇦🇺AU angle

Australian marketing teams using ChatGPT for content, research or reporting get immediate capability upgrades, but need to audit prompt libraries and workflows each cycle to capture the gains.

â—ŽWho cares

Content teams, marketing analysts and anyone using AI for multi-step tasks like campaign reporting, brief writing or competitive analysis.

â–²Risk

Teams that set up AI workflows once and never revisit them will underperform teams that optimise for each model generation.

Your move

Re-test your top five AI workflows on GPT-5.5 this week to measure quality and token efficiency gains.

Build a quarterly AI workflow review into your team's operating rhythm.

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Filip Ivanković
The Debrief / From Filip Ivanković
One every morning. Six months in, you'll see the patterns most don't.
Strategy, benchmarks, and what's actually moving in Australian marketing. Four-minute read. The reps compound.
Filip Ivanković·Founder, New RebellionAboutLinkedIn