OpenAI launches GPT-4.5, its “most knowledgeable model yet” in research preview, initially warning it's not a frontier model and may perform below o1 or o3-mini

OpenAI's newest and largest model is being released as a research preview.

The Verge 2025-02-28

Context & Ripple Effects

GPT-4.5 arrives after OpenAI’s o1 release foregrounded reasoning trade-offs, extending a product line in which model capability is not presented as a single ranking. The research-preview framing and the company’s own caveat make the model’s profile—not merely its scale—the relevant comparison.

Related coverage subsequently records o3 and o4-mini as reasoning-focused options, reinforcing a portfolio split between broad knowledge, reasoning performance, and lower-cost alternatives.

First-order effects

OpenAI adds GPT-4.5 to its available model lineup as a research preview, while explicitly limiting expectations for reasoning, coding, and some benchmark-oriented tasks.
Prospective users must evaluate GPT-4.5 for writing, contextual adaptation, and aesthetic judgment rather than assume that a newer, larger model is the default choice for every workload.

Second-order effects

Model selection becomes more workload-specific: teams testing GPT-4.5 will need to compare it with reasoning-oriented and smaller alternatives instead of treating version number as a sufficient procurement signal.
OpenAI’s messaging makes capability segmentation more salient for rival model vendors as well, since broad knowledge, reasoning, coding, and cost can be positioned as distinct competitive axes.

Third-order effects

If this portfolio pattern persists, general-purpose AI platforms will increasingly compete through routed or explicitly segmented model portfolios rather than a single universally “best” release.
That shift raises the importance of operational evaluation: enterprises will need task-level testing and governance to match models to use cases as capability claims become more multidimensional.

The trend: AI model competition is shifting from simple successor releases toward differentiated portfolios optimized for distinct capability and cost profiles.

Discussion

@quinnypig.com Corey Quinn on bluesky
“Would that our execs be half so relatable,” OpenAI continued. [embedded post]
@sama Sam Altman on x
GPT-4.5 is ready! good news: it is the first model that feels like talking to a thoughtful person to me. i have had several moments where i've sat back in my chair and been astonished at getting actually good advice from an AI. bad news: it is a giant, expensive model. we really …
@openai @openai on x
GPT-4.5 has entered the Chat. https://openai.com/live/
@karpathy Andrej Karpathy on x
GPT 4.5 + interactive comparison :) Today marks the release of GPT4.5 by OpenAI. I've been looking forward to this for ~2 years, ever since GPT4 was released, because this release offers a qualitative measurement of the slope of improvement you get out of scaling pretraining com…
@sama Sam Altman on x
it's very hard to get the math and ML right on a run as big as GPT-4.5, and requires difficult work at the intersection of ML and systems. @ColinWei11 , Yujia Jin, and @MikhailPavlov5 did excellent work to make this happen!
@emollick Ethan Mollick on x
Been using GPT-4.5 for a few days and it is a very odd and interesting model. It can write beautifully, is very creative, and is occasionally oddly lazy on complex projects. Feels like Claude 3.7 while Claude 3.7 feels like GPT-4.5.
@jconorgrogan Conor on x
GPT 4.5 seems to glitch out after long discussions invoking the term “explicitly” or “explicit” This has been reproduced multiple times [image]
@zeffmax Max Zeff on x
OpenAI removed language about GPT-4.5 not being a frontier AI model from its white paper. We just updated our article in @TechCrunch on GPT-4.5 with the following note. [image]
@levie Aaron Levie on x
The AI breakthroughs just keep coming. OpenAI just announced GPT-4.5, and we'll be making it available to Box customers later today in the Box AI Studio. We've been testing GPT4.5 in early access mode with Box AI for advanced enterprise unstructured data use-cases, and have seen …
@scottwu46 Scott Wu on x
GPT-4.5 has been awesome to work with. On our agentic coding benchmarks it already shows massive improvements over o1 and 4o. Excited to see the models' continued trajectory on code! One interesting data point: though GPT-4.5 and Claude 3.7 Sonnet score similarly on our overal…
@kylebrussell Kyle Russell on x
Tired: multimodal Wired: multi-model
@risphereeditor @risphereeditor on x
OpenAI just released GPT-4.5, and let's just say it's a disappointment. GPT-4.5 is, on average, only 5% better on benchmarks than GPT-4o. GPT-4.5 is currently only available to ChatGPT Pro users ($200 per month) and via the API ($75 per million input tokens and $150 per million
@natolambert Nathan Lambert on x
So GPT 4.5 tells us that character training gets easier with scaling? Regardless, when character is the only point OpenAI can flex for a release, you know it matters.
@adamscochran Adam Cochran on x
The only metric that GPT 4.5 seems slightly better on is hallucination avoidance, and that's only compared to other GPT models. It's notably worse at software and math problems, it struggles with continuity, and is just on par with cheaper models for research. Given the GPU
@emollick Ethan Mollick on x
I have been impressed by GPT-4.5's vision ability. It can differentiate and count much better than any other model. It even spotted the butterfly. [image]
@altryne Alex Volkov on x
GPT 4.5 is here with some evals! They best chat model “yet” “By vibes we measure the models EQ” “Should be ideal for creative writing” [image]
@simonw Simon Willison on x
First impressions of GPT-4.5 (via the API) is that it feels surprisingly slow [image]
@aidan_mclau Aidan McLaughlin on x
welcome, gpt-4.5 i've spent a lot of time playing with this model recently, and it's left me feeling the agi some thoughts [image]
@altryne Alex Volkov on x
“We're out of GPUs” 😵‍💫 [image]
@bindureddy Bindu Reddy on x
OMG! Check out GPT 4.5 pricing. Input per 1M tokens - $75 Output per 1M tokens - $150 This is downright crazy
@simonw Simon Willison on x
GPT 4.5 just told me it has a training cut-off date of October 2023, is that true? https://github.com/... It also made me this pelican [image]
@simonw Simon Willison on x
Huh, confirmed - October 2023. Same cut-off as o1, o3, gpt-4o and gpt-4o mini https://platform.openai.com/ ... https://x.com/...
@minimaxir Max Woolf on x
I wonder of OpenAI actually ran out of training data because 1.5 year old training data at this point is weird.
@satyanadella Satya Nadella on x
Major upgrades for Azure AI Foundry today: GPT-4.5 is now in preview, demonstrating a big step forward in both pre-training and post-training scale. Plus, new models from Cohere, Stability, and Microsoft. As AI becomes core to building every product, we're also rolling out new …
@inafried Ina Fried on x
New @axios: OpenAI debuts GPT-4.5. This is OpenAI's largest model yet — though the company declined to offer details about its size or the computing resources it took to train it. https://www.axios.com/...
@ai_for_success AshutoshShrivastava on x
GPT-4.5 is not a frontier model, but it is OpenAI's largest LLM, improving on GPT-4's computational efficiency by more than 10x. [image]
@jm_alexia Alexia Jolicoeur-Martineau on x
GPT 4.5 is as I expected: just more pretraining data. Pretraining scaling for text is mostly saturated. Reasoning (o1, deepseek) made us think that progress was going up exponentially, but its mostly better at tuned benchmarks. Progress continues, but its not exponential.
@lukolejnik Lukasz Olejnik on x
GPT-4.5 is weak at cybersecurity vulnerability aspects? GPT-4.5 also cannot assist in the development of radiological or nuclear weapons. https://cdn.openai.com/... [image]
@northstarbrain Alex Northstar on x
Gpt 4.5 Wait, this is... not good. [image]
@fyruzone @fyruzone on x
Gpt 4.5 performs WORSE than sonnet 3.5 (not even 3.7) on time horizon score [image]
@deedydas Deedy on x
From the GPT-4.5 System Card: “GPT-4.5 is not a frontier model, but it is OpenAI's largest LLM, improving on GPT-4's computational efficiency by more than 10x.” It offers: — increased world knowledge — improved writing ability — refined personality 2-7% lift on 4o at SWE-Bench [i…
@tmychow Trevor on x
“GPT-4.5 is not a frontier model, but it is OpenAI's largest LLM” [image]
@samsja19 @samsja19 on x
deepseek r1 release: open source o1 grok 3 release: beats every benchmark gpt 4.5 release: Can hold my hand when I am scared [image]
@kimmonismus @kimmonismus on x
OpenAI GPT-4.5 system-card already revealed! Link in comments [image]
@scaling01 @scaling01 on x
GPT-4.5 System Card “Our largest and most knowledgeable model yet” “scales pre-training further” [image]
@cyberandy Andrea Volpini on x
Orion? If true, the data scaling effort behind GPT-4.5 would be massive. [image]
@iterintellectus Vittorio on x
gpt-4.5 is getting closer to super persuasion [image]
@iscienceluvr Tanishq Mathew Abraham, Ph.D. on x
OpenAI GPT-4.5 System Card “We're releasing a research preview of OpenAI GPT-4.5, our largest and most knowledgeable model yet. Building on GPT-4o, GPT-4.5 scales pre-training further and is designed to be more general-purpose than our powerful STEM-focused reasoning models” [ima…
@swyx @swyx on x
idk man after o1/o3/OAIDR, gpt 4.5 is looking like a step back alllll the way to dec 2024 [image]
@tokenbender @tokenbender on x
congratulations to openai for shipping gpt 4.5, it is july 2024 and everyone is excited at these capabilities. also, the one thing the model is best at is being a wordcel, optimised for “high taste” i believe. [image]
@koltregaskes @koltregaskes on x
Wow, these GPT-4.5 benchmarks are, well, really poor!! I hope this isn't real. [image]
@nabeelqu Nabeel S. Qureshi on x
o3 (which backs Deep Research) can successfully perform 42% of OpenAI employees' PR contributions... 🤯 [image]
@tomwarren Tom Warren on x
OpenAI has just announced GPT-4.5, but it's warning that it's not a frontier AI model. It's OpenAI's “largest and most knowledgeable model yet,” but “its performance is below that of o1, o3-mini.” Full details 👇 https://www.theverge.com/...
r/artificial r on reddit
One-Minute Daily AI News 2/27/2025
r/perplexity_ai r on reddit
When do we think Perplexity will get GPT-4.5?
r/accelerate r on reddit
Introduction to GPT-4.5
@lemmk Karsten Lemm on bluesky
GPT-4.5 “is wildly expensive, costing $75 per million input token.” — Hopefully the output is worth it? 🤔 — Oh... 😥 — www.theverge.com/news/620021/ ... [embedded post]
@edzitron Ed Zitron on x
Also, $1.30 per hour per GPU is the Microsoft discount rate for OpenAI. Safe to assume there are other costs but raw compute for GPT 4.5 is massive and committing such resources at this time is truly fatalistic. suggests Altman has no other cards to play https://www.theinformatio…
@scobleizer Robert Scoble on x
OpenAI basically said the same thing too. It doesn't have enough NVIDIA. Of course its stock went down 8.5% today in reaction.
@edzitron Ed Zitron on x
Sam Altman is talking about bringing online “tens of thousands” and then “Hundreds of thousands” of GPUs. 10,000 GPUs costs them $113 million a year, 100k $1.13bn, so this is Sam Altman committing to billions of dollars to an expensive model that lacks any real new use cases. [im…
@jeremyphoward Jeremy Howard on x
# The *actual* LLM scaling law. Adding more compute and data to LLMs makes them: - Linearly more expensive, and - Logarithmically more useful. Therefore: - Scaling becomes less useful the more you do it (once you reach a point where cost is non-trivial).
@casper_hansen_ Casper Hansen on x
GPT 4.5 pricing is unhinged. If this doesn't have enormous models smell, I will be disappointed [image]
@bindureddy Bindu Reddy on x
TBH, we should thank OpenAI for dropping the API even when they are GPU constrained THANKS, OAI! 🙏🙏 Still don't have Grok 3 🤷
@farzyness Farzad on x
Why didn't OpenAI wait to get 4.5 down to reasonable pricing before they showed incremental improvement? My guess is because they need to stay relevant in public discourse + with investors due to competition models being just as good, if not better.
@inafried Ina Fried on x
Some details in this post from @sama including a big GPU influx needed - and coming - to serve GPT 4.5
r/NvidiaStock r on reddit
OpenAI CEO Sam Altman says the company is ‘out of GPUs’ | TechCrunch
r/singularity r on reddit
OpenAI CEO Sam Altman says the company is ‘out of GPUs’
r/nvidia r on reddit
OpenAI CEO Sam Altman says the company is ‘out of GPUs’ | TechCrunch
r/technology r on reddit
OpenAI CEO Sam Altman says the company is ‘out of GPUs’ | TechCrunch
@fintechdad @fintechdad on bluesky
“On several AI benchmarks, GPT-4.5 falls short of newer AI “reasoning” models from Chinese AI company DeepSeek, Anthropic, and OpenAI itself” hmmmm. [embedded post]
@bretcarmichael@mastodon.social Bret Carmichael on mastodon
AI competitors continue to merge, and competition is making them race to release new models more quickly. The individual versions are trending to meaningless, as users just use the best things available through their default provider. — https://techcrunch.com/... #AI #OpenAI …
@levie Aaron Levie on x
Box tested GPT-4.5 vs. GPT-4o in Box AI with 20,000+ data fields being pulled from enterprise content (like important details in a contract). We found a 19 pt improvement in single shot extraction. This is a huge improvement for any mission critical enterprise workflow. [image]
@jeremyphoward Jeremy Howard on x
This graph (from @enricoros, based on @paulgauthier work) show's GPT-4.5's perf on (IMO) the most practical & important eval: Aider Polyglot. If this is accurate, OpenAI is in *deep* trouble! Their crown jewel, the latest GPT, is *500x* more $$$ than DeepSeek v3, yet worse! [imag…
@eli_lifland Eli Lifland on x
And now I lengthen my timelines, at least if my preliminary assessment of GPT-4.5 holds up. Not that much better than 4o (especially at coding, and worse than Sonnet at coding) while being 15x more expensive than 4o, and 10-25x more expensive than Sonnet 3.7. Weird. [image]
@jeremyphoward Jeremy Howard on x
This is specifically for coding, which is by far the most common use of LLMs, and is highly correlated with how good they are at other important tasks.
@garymarcus Gary Marcus on x
Hot take: GPT 4.5 is mostly a nothing burger. GPT 5 is still a fantasy. • Scaling data and compute is not a physical law, and pretty much everything I have told you was true. • All the bullshit about GPT-5 we listened to for the last couple years: not so true. • People like @…
@karpathy Andrej Karpathy on x
Question 5 [image]
@kylebrussell Kyle Russell on x
The ultimate crypto bot
@krishnanrohit Rohit on x
Found a thing gpt 4.5 is great at, convincing other AIs to give it money [image]
@zeffmax Max Zeff on x
OpenAI just dropped it's largest AI model ever, GPT-4.5. But biggest does not mean best. The AI model is not as good as its AI reasoning models on many benchmarks, but OpenAI claims GPT-4.5 is its best model to chat with. More here in @techcrunch [image]

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