Anthropic releases Claude Sonnet 5.5 with 30% speed and cost gains

“Amazing release. This thread is already full of cynicism and angry hot takes.”

“It does vey well at one shotting a PacMan clone, pretty much perfect.”

“Claude 5.5 Sonnet is live and it’s roughly Opus 5.5 but cheaper www.anthropic.com/claude-sonne...”

“if opus is basically fable and sonnet is basically opus...”

“Introducing Claude Sonnet 5.5, the second model in the Claude 5.5 family. It’s a clear upgrade over Sonnet 5, runs more than 30% faster, and costs up to 30% less for most work.”

“The middle model is getting serious.”

“Sonnet 5.5 is available now in the Claude Platform and Claude Code.”

“Its speed also makes it well suited to fast iteration and collaboration on less complex tasks.”

“Claude Sonnet 5.5 Is INSANE – Seriously, This Model Is Ridiculous!”

“Anthropic's Claude Sonnet 5.5 runs 30% faster, cuts cost per task by up to 30%, and comes close to Opus 5.5 on coding benchmarks at an unchanged price.”

“Claude Sonnet 5.5 Is INSANE – Seriously, This Model Is Ridiculous!”

“Faster, more cost-effective AI for programming, docs, & more. Enhanced cybersecurity w/ integrated fallback.”

“It costs 20x more than the Chinese models I use. I just don’t need them anymore. Sure I’d use them if forced to for a job, but I don’t pay them outside of that anymore. And my job won’t even”

“Paying $200 a month and part of their Cyber Verification Program but can't use Opus 5.5 or Sonnet 5.5 for any authorized bounty work. Immediately get flagged for `Cyber`. This is bollocks. Their safeguards are shit.”

“The cost / performance chart shows that in almost all configurations, it looks worse than Opus. Why would you use Sonnet 5.5 on xhigh if you would get better results (higher score, cheaper cost) on Opus 5.5 high?”

“They're going to get left behind as workloads shift more and more to more cost-effective good-enough models. They're 10-100x behind in terms of speed and cost.”

“Sounds like at least for Anthropic models we reached peak cyber capabilities with Opus 4.8. Everything after that falls back to worse models”

“I feel very confident that if someone gave me 12.6 billion dollars then I could turn that into 4.6 bullion no problem”

“just like with those recent alleged math proofs, it looks like it was given the answers in advance from real humans doing actual research.”

“It's the real world dropout bit "I took one hundred thousand dollars and turned it into sixteen thousand dollars"”

“There are simply no real privacy protections on any of this shit, the companies doing it are all run by an insane cult and have zero scruples.”

““I’ve heard from a bunch of people in our field who say, ‘Uh oh, are they training on my prompts?’” Dr. Shipman said. “We can’t not think about it.” ... '[A]fter Anthropic’s announcement last week, he is winding down his”

“This is what’s killing me about this is that it’s not escaping shit! A computer can only do what you tell it, and every rogue AI story boils down to “well we didn’t think we needed to tell it not”

“all of our brilliant research minds putting all of their unpublished work into the giant knowledge–stealing machine are maybe not quite as bright as we give them credit for being”

“Sonnet 5.5 gives about 90% of Opus 5.5's capability at half the cost. BUT It regularly loses out to Opus 5.5 on cost efficiency at the highest reasoning level, because Opus uses the tokens more efficiently and makes fewer mistakes.”

“Unless you’re using frontier models like Astra, Sol, Fable, or Opus, I think you’re often better off using Chinese models for a fraction of the price. I’m not sure people realises just how competitive they’ve become. GLM and DeepSeek are”

“my own work is at least for the time being almost saturated by the model capabilities. I am not sure how I'd scale from here.”

“Sonnet is 1/5th the price and seemingly more powerful than fable (the model that was too powerful to release). I can't make sense of this. Why would anyone use fable now? Or are the benchmarks completely pointless”

“on "max" thinking effort it burned through 128,000 thinking tokens (taking 15 minutes to do that) and ran out before it had produced the final SVG.”

“So sonnet is better than Fable now? That Fable which was too dangerous to release? I am so confused now.”

“AI companies these days releasing models every week like Netflix episodes.”

“Anthropic continues to take the premium approach with Sonnet 5.5, same cost as Sonnet 5 (though they claim it is much more token efficient, I obviously have no idea if that's true or not).”

“more than half of the work to improve Claude is now being done by Claude itself”

“Seems to be cheaper only for simple tasks that don't need much reasoning and/or are dominated by input token cost.”

“Sonnet 5.5 seems to be kind of a token hog, so it's a different style of use. Opus is smart out of the gate, Sonnet works.”

“claude can generate plausible hypotheses that would impress me if they were presented in a ph.d. qualifying exam. it also does stupid shit all the time and i think anthropic 100% deserves the scrutiny lol”