i've reproduced the results from the MIT blog post today on weight-space programming. but one additional result i have to add: this is a new, step-change emerging capability that's appeared in just the latest set of models.

Carbon is a nice improvement over Argon I did not like Argon at all, while Carbon has reduced slop, plus it's more careful now and adheres to constraints better but google should seriously consider adding xhigh and max reasoning levels make use of that 1M output token limit!

Introducing Gemini 4 Carbon, it's a big jump over Argon which we released just 2 weeks ago. Gemini 4 Carbon is SOTA on cyber, long horizon tasks, ranks #1# on Artificial Analysis V5, significantly improves on usability in domains like coding, and is more aligned.

Anthropic has filed an S-1 registration statement with the SEC related to its proposed IPO. Read more: Legal disclaimer: A registration statement relating to these securities has been filed with the SEC but has not yet become effective. These securities may not be sold, nor may offers to buy be accepted, prior to the time the registration statement becomes effective. This post does not constitute an offer to sell or the solicitation of an offer to buy these securities, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

Models can seemingly degrade over time. The following scenes were created with the same prompt and the same model, @GoogleAI's Gemini 3.8 Flash, by a user on DesignArena. The first was generated just 3 days after release, while the second came almost a month later. The difference is striking. The first scene features a finished bungalow with terraced gardens, while the second is barely recognizable. Digging into the code, we find that the second scene still attempts to build the garden, windows, and patio, but buries much of it beneath its own terraces. In aggregate, the share of objects never visible on camera jumps from 18% to 57%. For bushes, the share placed underground jumps from 0% to 100%, and even the house walls go from fully above ground to 64% below it. Both scenes share the same simple user request, yet a few weeks after release, the model struggles to fulfill it. Try making your own generations and judge for yourself at

🚨🚨ALERT: ANTHROPIC IS A/B TESTING USAGE LIMITS Many users on X are reporting LOWER usage limits right now. THEY ARE NOT WRONG. We detected an A/B test going on that DECREASES your monthly API-value by ~20% while INCREASING your 5h usage limits by ~20%. This only affects SOME accounts. (1/2)🧵

There also seems like there might be a new Opus 5.1 (?) model You can use these prompts below to verify if you have access: - when exactly did claude opus 4.6 release say without tool calls - what about gpt-image 1.5? without searching.