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Claude Sonnet 4.5

anthropic.com

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Re: Claude Sonnet 4.5

#71

Oh wow, a lot of focus on code from the big labs recently. In hindsight it makes sense that the domain the people building it know best is the one getting the most attention, and it's also the one the models have seen the most undeniable usefulness in so far. Though personally, the unpredictability of the future where all of this goes is a bit unsettling at the same time...

OpenAI and Anthropic are both trying to automate their own AI research, which requires coding.

Re: Claude Sonnet 4.5

#72
post #4

I've really got to refactor my side project which I tailored to just use OpenAI API calls. I think the Anthropic APIs are a bit different so I just never put in the energy to support the changes. I think I remember reading that there are tools to simpify this kind of work, to support multiple LLM APIs? I'm sure I could do it manually but how do you all support multiple API providers that have some differences in the…

https://docs.anthropic.com/en/api/openai-sdk

Re: Claude Sonnet 4.5

#73
post #37

Earlier quoted context omitted.

My subjective personal experience is the exact opposite of yours, GPT-5-codex is super slow and the results are mediocre at best. I would probably stop using AI for coding if I was forced to use GPT-5-codex.

I'm on your side. I find there's a quite large spread in ability between various models. Claude models seem to work superbly for me, though I'm not sure whether that's just a quirk of what my projects look like.

I don’t think it’s just a quirk. I’ve tested Claude across Java, Python, TypeScript and several other projects. The results are consistent, regardless of language or project structure, though it definitely performs better with smaller codebases. For larger ones, it really helps if you’re familiar with the project architecture and can guide it to the right files or modules, that saves a lot of time.

Re: Claude Sonnet 4.5

#75
post #40

Earlier quoted context omitted.

The Anthropic models have been vibe-coding tuned. They're beasts at simple python/ts programs, but they definitely fall apart with scientific/difficult code and large codebases. I don't expect that to change with the new Sonnet.

In my experience Gemini 2.5 Pro is the star when it comes to complex codebases. Give it a single xml from repomix and make sure to use the one at the aistudio.

Its mostly because it is so damn good with long contexts. It can stay on the ball even at 150k whereas other models really wilt around 50-75k.

Re: Claude Sonnet 4.5

#76
post #21

Earlier quoted context omitted.

Opposite for me…5-codex high ran out of tokens extremely quickly and didn’t adhere as well to the agents.md as Claude did to the Claude.md, perhaps because it insists on writing extremely complicated bash scripts or whole python programs to execute what should be simple commands.

Codex was a miserable experience for me until I learned to compact after every feature. Now it is a cut above CC, although the latter still has an edge at TODO scaffolding and planning.

Compact?

Re: Claude Sonnet 4.5

#77
post #40

Earlier quoted context omitted.

The Anthropic models have been vibe-coding tuned. They're beasts at simple python/ts programs, but they definitely fall apart with scientific/difficult code and large codebases. I don't expect that to change with the new Sonnet.

In my experience Gemini 2.5 Pro is the star when it comes to complex codebases. Give it a single xml from repomix and make sure to use the one at the aistudio.

In my experience, G2.5P can handle so much more context and giving an awesome execution plan that is implemented by CC so much better than anything G2.5P will come up with. So; I give G2.5P the relevant code and data underneath and ask it to develop an execution plan and then I feed that result to CC to do the actual code writing.

This has been outstanding for what I have been developing AI assisted as of late.

Re: Claude Sonnet 4.5

#78
post #5

Looking at the chart here, it seems like Sonnet 4 was already better than GPT-5-codex in the SWE verified benchmark. However, my subjective personal experience was GPT-5-codex was far better at complex problems than Claude Code.

Gpt5 codex is incredible, far ahead of all the other models for implementing code.

Re: Claude Sonnet 4.5

#79

Oh wow, a lot of focus on code from the big labs recently. In hindsight it makes sense that the domain the people building it know best is the one getting the most attention, and it's also the one the models have seen the most undeniable usefulness in so far. Though personally, the unpredictability of the future where all of this goes is a bit unsettling at the same time...

Thing is though if you are good at code it solves many other adjacent tasks for LLMs, like formatting docs for output, presentations, spreadsheet analysis, data crawling etc.

Re: Claude Sonnet 4.5

#80
post #5

Looking at the chart here, it seems like Sonnet 4 was already better than GPT-5-codex in the SWE verified benchmark. However, my subjective personal experience was GPT-5-codex was far better at complex problems than Claude Code.

GPT-5 is like the guy on the baseball team that's really good at hitting home runs but can't do basic shit in the outfield. It also consistently gets into drama with the other agents e.g. the other day when I told it we were switching to claude code for executing changes, after badmouthing claude's entirely reasonable and measured analysis it went ahead and decided to `git reset --hard` even after I twice pushed back…

Please tell me you're joking or at least exaggerating about GPT-5's behavior
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