861–870 of 1001 posts
Everyone talked about the marketing stunt that was Anthropic's gated Mythos model with an 83% result on CyberGym. OpenAI just dropped GPT 5.5, which scores 82% and is open for anybody to use. I recommend anybody in offensive/defensive cybersecurity to experiment with this. This is the real data point we needed - without the hype! Never thought I'd say this but OpenAI is the 'open' option again.
This model is great at long horizon tasks, and Codex now has heartbeats, so it can keep checking on things. Give it your hardest problem that would take hours with verifiable constraints, you will see how good this is:) *I work at OAI.
I might just be following too many AI-related people on X, but omg the media blitz around 5.5 is aggressive. Soo many unconvincing "I've had access for three weeks and omg it's amazing" takes, it actually primes me for it to be a "meh". I prefer to see for myself, but the gradual rollout, combined with full-on marketing campaign, is annoying.
With the Pro plan it was available in both Codex and ChatGPT already when I first checked, which was within an hour of the release.
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I wonder if it's the same model and they just keep adding more post-training.
The rumor was that the 5.5 is a brand new pretrain. But who knows, it's 2x as expensive as 5.4, so it would check out.
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This brings up an interesting philosophical point: say we get to AGI... who's to say it won't just be a super smart underachiever-type? "Hey AGI, how's that cure for cancer coming?" "Oh it's done just gotta...formalize it you know. Big rollout and all that..." I would find it divinely funny if we "got there" with AGI and it was just a complete slacker. Hard to justify leaving it on, but too important to turn it off.
I’ve noticed that cursing and being rude makes the models stop being lazy. We’re in the darkest timeline.
Releases keep shifting from API forward to product forward, with API now lagging behind proprietary product surface and special partnerships. I'd not be surprised if this is the year where some models simply stop being available as a plain API, while foundation model companies succeed at capturing more use cases in their own software.
Possibly but you’d think they enjoy taking money for a product that supports itself (API)
This doesn't have API access yet, but OpenAI seem to approve of the Codex API backdoor used by OpenClaw these days... https://twitter.com/steipete/status/2046775849769148838 and https://twitter.com/romainhuet/status/2038699202834841962 And that backdoor API has GPT-5.5. So here's a pelican: https://simonwillison.net/2026/Apr/23/gpt-5-5/#and-some-peli... I used this new plugin for LLM: https://github.com/simonw/llm-op…