01What GPT 5.5 Is and How It Works

GPT 5.5 is OpenAI's latest AI model, and it's the first fully retrained base model since GPT 4.5. That means OpenAI went back to the foundation and rebuilt everything from scratch, not just tweaked the dial like with GPT 5.1, 5.2, 5.3, and 5.4. The result is a model that's sharper, reasons deeper, and handles long conversations much better.

GPT 5.5 works by planning, using tools, and checking its own work without needing constant permission. As OpenAI's president Greg Brockman said, it can look at unclear, messy problems and figure out what needs to happen next without you spelling it out. In testing, it handles multi-step tasks and just gets the job done.

It's codenamed Spud, and it's already crushing the competition on major benchmarks. On Terminal Bench 2.0, which tests complex coding workflows, GPT 5.5 scored 82.7% versus Claude Opus 4.7's 69.4% and Gemini 3.1 Pro's 68.5%. That's a 13-point jump, and it's not noise.

02Key Features of GPT 5.5

GPT 5.5 comes with several standout features that make it different from previous GPT 5 models. Here are the main ones:

  • Agentic coding - It plans, uses tools, and coordinates multiple steps for complex tasks.
  • Better computer use - It can operate a real computer by itself, scoring 78.7% on OSWorldVerified.
  • Knowledge work - It handles research, data analysis, spreadsheets, and reports better than rivals.
  • Context retention - It holds context way better across long conversations.
  • Efficiency - It matches GPT 5.4's response speed but uses about 40% fewer tokens to finish tasks in Codex.
  • Self-improvement - OpenAI used GPT 5.5 to rewrite its own serving code, boosting token generation speeds by over 20%.

There are also two versions: GPT 5.5 and GPT 5.5 Pro. The Pro version scores even higher on benchmarks like BrowserComp (90.1% vs 84.4%) and FrontierMath Tier 4 (39.6% vs 35.4%). Pro, Business, and Enterprise plans get both; Plus only gets the standard version.

03How to Get Started with GPT 5.5

Getting started with GPT 5.5 is easy, but there are a few steps you need to follow, especially since it's rolling out gradually. Here's what to do:

  1. Make sure you're on a paid ChatGPT plan (Plus, Pro, Business, or Enterprise).
  2. Open ChatGPT and go to the model selector. If you don't see GPT 5.5 yet, wait a few hours—it's rolling out gradually.
  3. Look for GPT 5.5 in Codex, not the regular Chat GPT model selector. It's available there first.
  4. If you're on a Plus plan, you'll only get the standard version. For Pro, Business, or Enterprise, you get both 5.5 and 5.5 Pro.
  5. Start a new session in Codex and choose GPT 5.5 from the model list.
  6. Give it a task, like fixing a bug or building a feature, and let it work.

Note that the API isn't live yet. OpenAI is working on additional safety requirements first, so API access is coming soon but not immediately.

04How to Use GPT 5.5 – Examples from the Episode

In the episode, Julian walked through real-world tests that show how to use GPT 5.5 effectively. One example was Dan Schipper from Every, who gave GPT 5.5 a broken app that his team spent days trying to fix. GPT 5.4 couldn't do it, but GPT 5.5 looked at the code and produced the same kind of rewrite a senior engineer decided on.

Another example was Pietro Schirano from MagicPath, who had GPT 5.5 merge a branch with hundreds of front-end and refactor changes into a main branch that had also changed a lot. The model resolved all the conflicts in one shot in about 20 minutes, a task that would take a senior engineer half a day or more.

For everyday use, you can use GPT 5.5 in Codex to build workflows: upload your data and it generates your weekly report automatically. In one internal OpenAI example, their finance team used GPT 5.5 in Codex to review over 24,000 K1 tax forms (71,000+ pages) and finished two weeks faster than the previous year. Another team automated their weekly business reports and saved 5-10 hours per week.

05Results and Comparisons from the Episode

Julian compared GPT 5.5 with Claude Opus 4.7 and Gemini 3.1 Pro across multiple benchmarks. Here are the key results:

  • Terminal Bench 2.0 (agentic coding): GPT 5.5 scored 82.7%, Opus 4.7 got 69.4%, Gemini 3.1 Pro got 68.5%.
  • GDPVal (knowledge work across 44 occupations): GPT 5.5 hit 84.9%, Opus 4.7 got 80.3%, Gemini 3.1 Pro got 67.3%.
  • OSWorldVerified (computer use): GPT 5.5 scored 78.7%, Opus 4.7 scored 78% - close but GPT 5.5 wins.
  • SWE Bench Pro (real-world GitHub issues): Opus 4.7 still leads with 64.3% vs GPT 5.5's 58.6%.
  • Cybergym (cybersecurity): GPT 5.5 scored 81.8% vs Opus 4.7's 73.1%.
  • BrowserComp: Gemini 3.1 Pro leads with 85.9% vs GPT 5.5's 84.4% (but 5.5 Pro hits 90.1%).

In real-world tests, GPT 5.5 also helped discover a new mathematical proof about Ramsey numbers, verified by formal software, and an immunology professor used it to analyze a dataset with 62 samples and nearly 28,000 genes, producing a report that would have taken months.

06Tips, Limits, and Mistakes to Avoid

While GPT 5.5 is powerful, there are some limits and pitfalls to watch out for. Here are a few tips from the episode:

  • Watch your usage limits - Right after release, limits are tight. Julian burned through his standard plan limit in about five minutes and created only two things. Even after upgrading, he still hit limits.
  • Don't expect it everywhere yet - GPT 5.5 wasn't in the regular Chat GPT model selector at first; it was in Codex. OpenAI is rolling it out gradually to all paid users.
  • Use Codex for heavy work - Since the API isn't live yet, Codex is your main access point. If you need high-volume agent work, you might consider alternatives like OpenClaw or Hermes with free APIs.
  • Know the versions - On Plus, you only get the standard version. If you need the Pro version's higher scores, you need a Pro, Business, or Enterprise plan.
  • Don't ignore cybersecurity - GPT 5.5 is rated high on cybersecurity, but it's not at the level of Anthropic's Mythos, which isn't released publicly.

Mistakes to avoid: thinking benchmarks don't matter (they show real capability jumps), waiting too long to test it (the cycle is accelerating), and assuming the release-frame limits will last forever - they're likely temporary.

07Who GPT 5.5 Is For and Why It Matters

GPT 5.5 is for anyone who runs a business, freelances, sells products online, or creates content. If you're not paying attention to AI models, you're falling behind. The release cycle is speeding up: GPT 5.4 came out six weeks ago, Opus 4.7 a week ago, and now GPT 5.5.

Each time, models get meaningfully better - not just a bit.

For business owners, GPT 5.5 can automate reports, research, and data analysis. For developers, it's a powerful coding assistant that can fix bugs and merge branches in minutes. For researchers, it can produce original findings that hold up under scrutiny.

For creators, it can build complex designs like scrolling banners and custom animations.

OpenAI has over 900 million weekly active users on ChatGPT, over 50 million paying subscribers, and 4 million active Codex users. Every one of them just got a big upgrade. If you're competing against someone using GPT 5.5 and you're not even aware it exists, you've already lost a step.

That's why it matters now.

08The Future of AI with GPT 5.5

GPT 5.5 is the smartest publicly available AI model right now, but the competition is fierce. Anthropic's Opus 4.7 still leads on SWE Bench Pro and has a conversational quality that many love. Gemini 3.1 Pro is strong on BrowserComp.

DeepSeek v4 is rumored, and Claude Miphos was announced. The future is about doing real work, not just answering questions.

Julian recommends picking the best tool for your use case. GPT 5.5 is incredible for agentic coding and multi-step work. Opus 4.7 is best for conversational quality and instruction following.

OpenClaw gives you flexibility with any model. The key is to start using these tools now - every day you wait, someone else gets ahead.

The models are getting better at operating computers, building apps, analyzing data, and writing code. Whether GPT 5.5 keeps the crown is uncertain, but today he took back the top spot. If you're smart, you'll start using it now.