Part of OpenAI Trade Secrets Theft · 4 stories · since Sep 14 · newest 18m ago
Anthropic launches Claude Opus 5.5, cutting price 40% while lifting coding performanceEarly users report strong coding gains alongside new restrictions
5 Yesterday 4:00 PM · 1d ago · 4 articles · 4 posts · 20 comments · 4 sources · development 5 of 7
Developers testing Opus 5.5 in Claude Code and third-party tools praised its speed, clarity and coding output, while others flagged that upgrading could strip away previously approved cybersecurity access.
“Just a warning that you'll lose your Opus5 cyber access if you upgrade to 5.5 which refuses cyber capability even if you're approved.”
mmaunderAnthropic Developer of Claude Opus 5.5
Dario Amodei Anthropic CEOMETR / Frontier Design External evaluatorsClaude Code developers Users of Anthropic's coding agent
The whole story articlespostscomments the bright band is this development · numbered dots are the others · click one to jump
Reported in the same hours no headline names this development itself — these 4 claims were published in its stretch
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first by MacRumors, 1d ago · also MacRumors Forums
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first by Android Authority, 1d ago
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first by The New Stack, 1d ago
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first by PCWorld, 1d ago
What people said 22 voices · verbatim
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I've asked Claude Opus 5.5 to create 100 HTML files Rules were simple: - look stunning - zero repetitive designs - go full creative mode CLAUDE OPUS 5.5 IS THE BEST MODEL I HAVE EVER TESTED !!! The previous best results on this experiment was of Fable 5.1, but Opus 5.5 is NEXT
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Opus 5.5 is neck-and-neck with Fable 5.1 and Astra 6 in my vibe-coding tests - maybe even better than Fable 5.1Minecraft clone: https://senko.net/vibecode-bench/2026/voxel-opus-5.5.html (Opus 5.5) vs https://senko.net/vibecode-bench/2026/voxel-fable-5.1.html (Fable 5.1) vs https://senko.net/vibecode-bench/2026/voxel-gpt-6-astra.html (Astra…
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Initial usage of Opus 5.5, much better than Opus 5, you can actually understand what it's saying, it actually executes without second guessing itself, and is pretty quick and thorough on implementation. Opus 5 was one of the worst models that Anthropic ever produced imo, 5.5
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I have used Fable, Astra, Opus 5 and Sol 5.6 in Claude Code and Codex heavily since each of these have been released. Recently, I settled for Sol 5.6 as my daily driver, but with this release Opus 5.5 might be the one.Fable is on a class of its own when it comes to coding and orchestration, but it runs out pretty quick and is prohibitively…
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No thanks.I'm good with DeepSeek v4.1 set to high. It is a relentlessly "hardworking" dirt cheap model.Told it to convert a products page (that had two different fonts based on language) from two columns layout to 5 columns on desktop and 2 columns on mobile ensuring typography is readable.My man went into spawning sub agent which failed to drive…
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In a previous post on Mythos 5.1, simonw posted an animated version of his pelican. [0]Using the claude.ai, I asked "create a 3d animation from this" and pasted the animation SIML. I just did that test again. There is significant improvement.Claude 5.5 (high): https://claude.ai/artifact/5EgqfWcyVtLwJDQq6fsPUmClaude 5 (high):
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The new communication style still made me react negatively, but I hope it will be better in use.Quoted:"Please explain the issue to me.Claude Opus 5.5:The extra drop is a bug in the billing refactorThe free-tier change accounts for only $1.50 of acme’s August drop. The other $9.92 comes from a bug in commit 0552feb. That commit was labelled “No…
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Welp, it's now blocking me from doing extraordinarily mundane tasks because of "safety". I've been an Opus fan for a long time, but this instantly made me cancel my subscription and move to OpenAI (which I also assume will screw me soon enough). Chinese models are almost there for my needs, and I can't wait to switch to them and never look back.
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I've reached the saturation point.I don't have time to really get to know one model before the next is out, and I'm just talking about OpenAI and Anthropic, never mind the long tail of alternatives.So I just more or less haphazardly pick one based on the mood I'm in, and set reasoning effort based on how much quota I have left.
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The endless cynicism in this thread is so very draining. Can we not do this terrible circle of excessive criticism?The productive comments here are so far and few between. I have no issue with people criticizing Anthropic or AI companies in general, but for the love of everything, at least make worthy criticisms. Not these incessant sophisms.
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Isn't the idea that they claim to be willing to slow down if everyone does (ie governments force everyone to), but otherwise they won't slow down because they still think they'll make the best choices with superintelligence if they get there first? That's my understanding of what all the major labs claim to believe anyway.
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When coding, the top-tier model is ultimately too expensive, so I use Opus, but the news that the cost per use for GPT or Claude is going down is very welcome. I really like that they’re even changing the writing style. I was worried whether it was a problem with my settings or if my literacy was declining. Both improvements are welcome.
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Anecdata ahead: I took some time to work with Opus 5.5 today. The work feels strong and comprehensive. I'm not getting the ugly "claudish" speak of Opus 5.0. Communication feels more natural and pleasant to read. Good results so far in my preliminary research.
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I think a lot of outsiders interpret “pace the frontier” as slowing down, whereas the labs see AI improvements on track to accelerate dramatically and intend pacing as slowing the acceleration in capability improvements, rather than slowing down altogether.
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So funny how both OpenAI and Anthropic post outdated pages at the same time. Opus 5.5 has benchmarks against Sol 5.6, and Sol & Luna 6 have their benchmarks against Opus 5.Why do those labs keep releasing on the same day?!?
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When using max effort, I run into context compaction quite a lot. I haven't seen any increase in context window size at all over the past half year (stuck at 1M).Are the frontier labs even working on this problem?
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In any professional sport, anyone can lobby the rules committee for a rules change and hope for the best. Meanwhile if you can't get one, you play the game by the existing set of rules, and you play to win.
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When my mom told me to pace myself, it usually meant that I was going too slow.This term is quite ambiguous. Did Dario mean that they need to go faster while making it sounds like they will slow down???
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I don’t know why we should believe that Anthropic is actually doing this, instead of the alternative explanation that LLM advancements are slowing in general.
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"You're right, and it's the exact thing I flagged two turns ago and then did anyway." - Opus 5 xhigh, today.About the time.
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The thing I'd actually want to know: is Opus 5.5 Medium genuinely equivalent to Astra High on real work...
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Pacing the frontier doesn't mean stopping development of smaller models with better distillation and RL.
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