The Debrief
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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.

◎Who cares

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

▲Risk

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