1. We believe in iterative deployment; although GPT-5.5 is already a smart model, we expect rapid improvements. Iterative deployment is a big part of our safety strategy; we believe the world will be best equipped to win at the team sport of AI resilience this way. 2. We believe
GENERATIVE AI
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GPT-5.5 Achieves Breakthrough in Long-Running Task Reliability
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GPT-5.5 is MUCH more reliable on longer running tasks – for the first time with any model.
— Peter Gostev (@petergostev) 23 avril 2026
As we speak I have a migration running for over 7+ hours – this literally never happened before, the models would maybe run for 30 mins or of you really shout at them for 2-3 hours.… pic.twitter.com/nxdrKZnOzWGPT-5.5 is MUCH more reliable on longer running tasks – for the first time with any model. As we speak I have a migration running for over 7+ hours – this literally never happened before, the models would maybe run for 30 mins or of you really shout at them for 2-3 hours.
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GPT-5.5 Launch Announcement Live Broadcast
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— Dan Shipper 📧 (@danshipper) 23 avril 2026
LIVE VIBE CHECK: GPT-5.5 IS OUT https://
x.com/i/broadcasts/1
qKVmQVoVwaxB
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API Pricing Announcement: $5 per Million Input Tokens
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API pricing will be $5 per 1 million input tokens and $30 per 1 million output tokens, with a 1 million context window. (Remember, you will need less tokens per task than 5.4!)
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GPT-5.5 Launch Marks Next AI Evolution Milestone
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We're watching AI evolve in real time. GPT-5.5 isn't just a launch – it's another proof point that the decade of intelligent systems is well underway.
— NVIDIA (@nvidia) 23 avril 2026
Congrats to the entire @OpenAI team on another impressive milestone. 🎉 https://t.co/xmYSJnK93GWe're watching AI evolve in real time. GPT-5.5 isn't just a launch – it's another proof point that the decade of intelligent systems is well underway. Congrats to the entire @OpenAI team on another impressive milestone.
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Pareto Frontiers: Extended Context and Improved Inference Speed
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looks like new Pareto frontiers across everything:
— swyx 🇸🇬 (@swyx) 23 avril 2026
– Context: 400K context in Codex and a 1M in API
– API Pricing: $5/m input and $30/m output tokens.
– Codex improved its own inference speed 20% lol
– First generation co-designed with GB200 and GB300 NVL72
– 82.7% on… https://t.co/J5CL5fKmsq pic.twitter.com/nJG1vubSdNlooks like new Pareto frontiers across everything: – Context: 400K context in Codex and a 1M in API
– API Pricing: $5/m input and $30/m output tokens. – Codex improved its own inference speed 20% lol – First generation co-designed with GB200 and GB300 NVL72 – 82.7% on -
GPT 5.5: Incremental Progress, Not Mythical Leap Forward
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Taking a look at the benchmarks that head the article, one thing becomes clear: it's not a Mythos-level model. It simply follows the continuationist saga we've seen with GPT 5.1, GPT 5.2, GPT 5.4 and now GPT 5.5 So a priori, only the jump in FrontierMath Tier 4 gets me excited
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New Codex Features Coming Soon with Latest Model
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Also, a ton of new Codex features coming soon! Fun little bundle w/the new model.
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GPT-5.5 Released: New AI Model Available
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GPT-5.5 is here! We hope it's useful to you. I personally like it.
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New AI Model Launches Today: Faster, More Token-Efficient
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It is smart and fast; per-token speed matches 5.4 and it uses significantly fewer tokens per task. In my experience, it "gets what to do". Rolling out today in ChatGPT and Codex. We are working with API customers on security and safeguards and plan to launch in API very soon.