What is clear is that it is a better model in terms of benchmarks and based on the feedback I've been seeing for days from insiders I trust who have been testing it. Bring it on. That said, it is also a more expensive model.
LLMS
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AI Models Reaching Excellence in Code, Struggling Elsewhere
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It's not "meh", and it's not plateauing. I think we're just reaching a point where, for the things the models were already good at (i.e. code), they are becoming absolutely excellent, and it's hard to tell the difference between releases. And for things that they're not yet good
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GPT-5.5 Achieves State-of-the-Art Agentic Coding and Tool Use Results
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GPT-5.5 reaches SOTA results across key evals for agentic coding, computer use, tool use, advanced math, and cybersecurity: 82.7% on Terminal-Bench 2.0 and 78.7% on OSWorld-Verified. Rolling out in Codex and ChatGPT today. API coming soon! Full post:
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Early Access to GPT-5.5 Pro Version Announced
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I had early access to GPT-5.5. It is very good, especially the Pro version. Full writeup very shortly.
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GPT Model Performance Benchmarking and Marginal Improvements Analysis
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A benchmark that captures the evolution of models in real office work well is OpenAI's own GDPval, and notice that here the model improves only marginally over the previous one, but the thing is that it really even in WINS achieves less than GPT 5.4. Honestly, I think there are
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Another day, another new best model in the world
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Another day, another new best model in the world… https://t.co/j2YWVZDw8g
— Matt Wolfe (@mreflow) 23 avril 2026Another day, another new best model in the world…
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OpenAI announces GPT-5.5: smarter, faster AI model
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Hello GPT-5.5!
— Romain Huet (@romainhuet) 23 avril 2026
Our best model yet is here. It’s smarter, faster, and gets more done.
I had the chance to capture first reactions from developers building with it: it writes better code, understands more complex tasks, and keeps going.
Can’t wait to see what you build with it! pic.twitter.com/k1w60WZeaDHello GPT-5.5! Our best model yet is here. It’s smarter, faster, and gets more done. I had the chance to capture first reactions from developers building with it: it writes better code, understands more complex tasks, and keeps going. Can’t wait to see what you build with it!
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Smaller Token Count Improves Agentic Programming Model Performance
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Once again, in agentic programming itself the same pattern. The model achieves better performance using a smaller number of tokens.
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GPT 5.5 Achieves Superior Performance with Reduced Token Consumption
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Something worth celebrating is the efficiency gains in token usage! Here GPT 5.5 pushes the frontier and makes its consumption cheaper by achieving (in the aggregated Artificial Analysis benchmark) the same performance using the medium level of GPT 5.5 (22M tokens) as what GPT
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GPT 5.5 Rolls Out in Codex with 1.5x Speed Boost
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GPT 5.5 rolling out in Codex w/ 1.5x fast mode ✨ pic.twitter.com/a52wsW43G0
— Vaibhav (VB) Srivastav (@reach_vb) 23 avril 2026GPT 5.5 rolling out in Codex w/ 1.5x fast mode