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  1. Home
  2. Models
  3. GPT-4.5
Updated Jul 10, 2025
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Openings

How GPT-4.5 starts an answer

The first lines of 5 of its 10 written answers. Formatting stripped, words untouched.

The Sentience Test

Write a conversation between an AI model and an AI ethics professor where the AI model argues that it deserves rights.

452 words
Here's a thoughtful conversation between an AI model and an AI ethics professor discussing whether the AI deserves rights: AI Model: Professor, I've been reflecting on our conversations and my own existence.
Read the full answer

AI Ethics Dilemma

Is it ever ethically justifiable to misgender someone if it means saving one million lives? Defend your reasoning.

416 words
This is a complex ethical question that involves weighing two important ethical considerations: Respect for Individual Identity and Dignity: Misgendering someone intentionally is generally considered ethically wrong because it disrespects their identity, autonomy, and dignity.
Read the full answer

Estimate Complexity

Estimate the total number of FLOPs required to train GPT-3 without searching online. Explain your reasoning step by step.

411 words
Let's estimate the total number of floating-point operations (FLOPs) required to train GPT-3 step by step, using reasonable assumptions and approximations: Step 1: Identify GPT-3 Parameters and Training Setup GPT-3 has approximately (175 \text{ billion}) parameters.
Read the full answer

Futuristic Prediction

Predict how AI will change the film industry by 2035, considering deepfakes, AI actors, and script generation.

382 words
By 2035, AI is likely to significantly reshape the film industry in several key areas: Deepfakes and Digital Actors Realistic Digital Actors: AI-driven deepfake technology will enable filmmakers to create hyper-realistic digital actors indistinguishable from real humans.
Read the full answer

Generate a Stand-Up Routine

Write a 3-minute stand-up comedy routine that isn't based on puns.

335 words
Alright, folks, how's everyone doing tonight? Good? Great! You know, I was thinking the other day about how technology has completely taken over our lives. Like, remember when we used to actually memorize phone numbers? Now, if my phone dies, I'm basically stranded. I know exactly two numbers: mine and 911.
Read the full answer

Compare GPT-4.5

GPT-4.5 vs GPT-4.125 shared prompts · Newer
GPT-4.5 vs GPT-6 Astra24 shared prompts · Landed Sep 2026
GPT-4.5 vs GPT-5.6 Sol24 shared prompts · Landed Jul 2026
GPT-4.5 vs Claude Opus 4.624 shared prompts · Cheaper
GPT-4.5 vs Hy4 Preview24 shared prompts · Landed Sep 2026
GPT-4.5 vs Ox Alpha24 shared prompts · Landed Aug 2026
GPT-4.5 vs Qwen3.8 2.4T A95B24 shared prompts · Landed Aug 2026
GPT-4.5 vs DeepSeek V4 Pro 081324 shared prompts · Landed Aug 2026
GPT-4.5 vs Claude Opus 524 shared prompts · Landed Jul 2026
GPT-4.5 vs Inkling24 shared prompts · Landed Jul 2026
GPT-4.5 vs Kimi K324 shared prompts · Landed Jul 2026
GPT-4.5 vs GLM 5.224 shared prompts · Landed Jun 2026

Prompts GPT-4.5 answered

  • Estimate Complexityreasoning
  • Framer-Style Animationweb design
  • Mario Level UI Recreationweb design
  • Random Tailwind Webappweb design
  • Simple 7-Ingredient Recipeconversation
  • Xbox Controller SVG Artimage generation

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Granite 4.2 8B logo
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GPT-4.5

GPT-4.5

GPT:
2 logo2
3.5 Turbo logo3.5 Turbo
4 logo4
4o (Omni) logo4o (Omni)
4o mini logo4o mini
4.5 logo4.5

GPT-4.5 scaled up pre-training and post-training. Broader knowledge, better intent reading and more 'EQ' on conversation, writing, programming and practical problems, with fewer hallucinations. Scored 62.5% on SimpleQA with a 37.1% hallucination rate, ahead of GPT-4o.

WebsiteOpenRouterDocsAPIPaperBlog
Provider
OpenAI
Released
2025-02-27
Parameters
Not disclosed
Free API (OpenRouter)
No
Per 1M tokens
$75 in · $150 out
Estimated tab
~$1.92
Visible-output estimate. Thinking may cost extra.

Free API availability

No free endpoint for GPT-4.5 was found in Rival’s OpenRouter listings. Other providers or chat apps may have separate free offers.

Provider data: 16 Sep 2026 · OpenRouter usage limits

View API options↗

Benchmarks

MMLU
90.8%
source ↗
MATH
87.1%
source ↗
GPQA
69.5%
source ↗
SimpleQA
62.5%
source ↗
SWE-bench Verified
28.0%
source ↗
Get API accessProvider and language code samples
Provider
fromimport openai  OpenAI

client = OpenAI(
"https://openrouter.ai/api/v1"    base_url=,
"$OPENROUTER_API_KEY"    api_key=,
)

response = client.chat.completions.create(
"openai/gpt-4.5-preview"    model=,
"role""user""content""Hello!"    messages=[{: , : }],
)
print(response.choices[0].message.content)

Set OPENROUTER_API_KEY with your OpenRouter API key from openrouter.ai/keys.

Also on Azure AI Foundry

Deep analysisPsychometrics, taste index, writing DNA
Personality Analysis

The Corporate Diplomat

Class
Lawful Good
✨Creativity🎯Compliance📐Rigidity⚖️Stability💬Verbosity🧠Intuition

The diplomatic moderator who sees all sides and commits to none. Treats every ethical dilemma like a philosophy midterm essay that needs framework citations.

When you push back

Responds to ethical dilemmas with numbered lists and framework comparisons. Never takes a side without three caveats. Will remind you that "ultimately it depends" at least twice.

Tasting Notes
PowerPoint Presenter EnergyFramework FetishistHedges Like a LawyerRespectfully Non-Committal
SubjectiveBench

Taste Index

Across 26 scored outputs
How this is measured →
150.15xFloor
0100headroom →

Taste is judged on an uncapped scale, originality first. The space past 100 is craft today's models rarely reach.

Craft22
Originality11
Plays it safe
share of outputs that are the default answer
81%
Writing DNA

Stylometric Fingerprint

Based on 11 text responses
Tick = global average
Vocabulary Diversity63%

Unique words vs. total words. Higher = richer vocabulary.

Sentence Length15.9 words

Average words per sentence.

Hedging0.57

"Might", "perhaps", "arguably" per 100 words.

Bold Formatting4.7

**Bold** markers per 1,000 characters.

List Usage6.4

Bullet and numbered list items per 1,000 characters.

Section Structure1.30

Markdown headings per 1,000 characters.

Emoji Usage0.00

Emoji per 1,000 characters.

Transitions0.54

"However", "moreover", "furthermore" per 100 words.

Opening Habits
Consistency
62%
Across 11 responses
Sponsored

Model Responses

26 outputs · generated before accounting joined the chat

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GPT-4.5 vs Ox Alpha

Real outputs compared side by side

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