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Claude Opus 4.5

anthropic.com

41–50 of 525 posts

Re: Claude Opus 4.5

#41

The burying of the lede here is insane. $5/$25 per MTok is a 3x price drop from Opus 4. At that price point, Opus stops being "the model you use for important things" and becomes actually viable for production workloads. Also notable: they're claiming SOTA prompt injection resistance. The industry has largely given up on solving this problem through training alone, so if the numbers in the system card hold up under a…

It's 1/3 the old price ($15/$75)

Re: Claude Opus 4.5

#42
post #12

I've played around with Gemini 3 Pro in Cursor, and honestly: I find it to be significantly worse than Sonnet 4.5. I've also had some problems that only Claude Code has been able to really solve; Sonnet 4.5 in there consistently performs better than Sonnet 4.5 anywhere else. I think Anthropic is making the right decisions with their models. Given that software engineering is probably one of the very few domains of AI…

I gave Sonnet 4.5 a base64 encoded PHP serialize() json of an object dump and told him to extraxt the URL within.

It gave me the Youtube-URL to Rick Astley.

Re: Claude Opus 4.5

#43
post #12

I've played around with Gemini 3 Pro in Cursor, and honestly: I find it to be significantly worse than Sonnet 4.5. I've also had some problems that only Claude Code has been able to really solve; Sonnet 4.5 in there consistently performs better than Sonnet 4.5 anywhere else. I think Anthropic is making the right decisions with their models. Given that software engineering is probably one of the very few domains of AI…

Gemini 3 was awful when i gave it a spin. It was worse than cursor’s composer model.

Claude is still a go to but i have found that composer was “good enough” in practice.

Re: Claude Opus 4.5

#45
post #12

I've played around with Gemini 3 Pro in Cursor, and honestly: I find it to be significantly worse than Sonnet 4.5. I've also had some problems that only Claude Code has been able to really solve; Sonnet 4.5 in there consistently performs better than Sonnet 4.5 anywhere else. I think Anthropic is making the right decisions with their models. Given that software engineering is probably one of the very few domains of AI…

My workflow was usually to use Gemini 2.5 Pro (now 3.0) for high-level architecture and design. Then I would take the finished "spec" and have Sonnet 4.5 perform the actual implementation.

I like this plan, too - gemini's recent series have long seemed to have the best large context awareness vs competing frontier models - anecdotally, although much slower, I think gpt-5's architecture plans are slightly better.

Re: Claude Opus 4.5

#46
This is gonna be game-changing for the next 2-4 weeks before they nerf the model.

Then for the next 2-3 months people complaining about the degradation will be labeled “skill issue”.

Then a sacrificial Anthropic engineer will “discover” a couple obscure bugs that “in some cases” might have lead to less than optimal performance. Still largely a user skill issue though.

Then a couple months later they’ll release Opus 4.7 and go through the cycle again.

My allegiance to these companies is now measured in nerf cycles.

I’m a nerf cycle customer.

Re: Claude Opus 4.5

#47
post #12

I've played around with Gemini 3 Pro in Cursor, and honestly: I find it to be significantly worse than Sonnet 4.5. I've also had some problems that only Claude Code has been able to really solve; Sonnet 4.5 in there consistently performs better than Sonnet 4.5 anywhere else. I think Anthropic is making the right decisions with their models. Given that software engineering is probably one of the very few domains of AI…

I gave Sonnet 4.5 a base64 encoded PHP serialize() json of an object dump and told him to extraxt the URL within. It gave me the Youtube-URL to Rick Astley.

You should probably tell AI to write you programs to do tasks that programs are better at than minds.

Re: Claude Opus 4.5

#48
post #11

Did anyone else notice Sonnet 4.5 being much dumber recently? I tried it today and it was really struggling with some very simple CSS on a 100-line self-contained HTML page. This never used to happen before, and now I'm wondering if this release has something to do with it. On-topic, I love the fact that Opus is now three times cheaper. I hope it's available in Claude Code with the Pro subscription. EDIT: Apparently…

Anecdotally, I kind of compare the quality of Sonnet 4.5 to that of a chess engine: it performs better when given more time to search deeper into the tree of possible moves (more plies). So when Anthropic is under peak load I think some degradation is to be expected. I just wish Claude Code had a "Signal Peak" so that I could schedule more challenging tasks for a time when its not under high demand.

Re: Claude Opus 4.5

#49
post #12

I've played around with Gemini 3 Pro in Cursor, and honestly: I find it to be significantly worse than Sonnet 4.5. I've also had some problems that only Claude Code has been able to really solve; Sonnet 4.5 in there consistently performs better than Sonnet 4.5 anywhere else. I think Anthropic is making the right decisions with their models. Given that software engineering is probably one of the very few domains of AI…

I gave Sonnet 4.5 a base64 encoded PHP serialize() json of an object dump and told him to extraxt the URL within. It gave me the Youtube-URL to Rick Astley.

If you're asking an LLM to compute something "off the top of its head", you're using it wrong. Ask it to write the code to perform the computation and it'll do better.

Same with asking a person to solve something in their head vs. giving them an editor and a random python interpreter, or whatever it is normal people use to solve problems.

Re: Claude Opus 4.5

#50
post #12

I've played around with Gemini 3 Pro in Cursor, and honestly: I find it to be significantly worse than Sonnet 4.5. I've also had some problems that only Claude Code has been able to really solve; Sonnet 4.5 in there consistently performs better than Sonnet 4.5 anywhere else. I think Anthropic is making the right decisions with their models. Given that software engineering is probably one of the very few domains of AI…

I really don’t understand the hype around Gemini. Opus/Sonnet/GPT are much better for agentic workflows. Seems people get hyped for the first few days. It also has a lot to do with Claude code and Codex.
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