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OpenAI ↗Released February 27, 2025

GPT-4.5

#4 Arena RankUndisclosed parameters

GPT-4.5 ranks in the top 10 on the Arena leaderboard. Context window: 0.128K tokens.

Context

128K

Input

$75.00

Key Specifications

🏆

Arena Rank

#4

📐

Context Window

128K

📥

Input Price

per 1M tokens

$75.00

📤

Output Price

per 1M tokens

$150.00

🧠

Parameters

Undisclosed

🔒

Open Source

No

Best For

Creative writingnuanced understandingEQ tasks

About GPT-4.5

GPT-4.5 is OpenAI's largest and most knowledge-rich model, designed to excel at creative, nuanced, and emotionally intelligent tasks. Unlike the reasoning-focused o-series models, GPT-4.5 was trained with a massive amount of data to develop deep world knowledge and conversational sophistication. It produces more natural, human-like responses and demonstrates improved understanding of context, tone, and subtext. The model is particularly strong at creative writing, brainstorming, open-ended exploration, and tasks requiring emotional intelligence. However, its premium pricing ($75/1M input tokens) makes it the most expensive OpenAI model, positioning it for use cases where the highest quality creative output justifies the cost. It represents OpenAI's investment in making AI more relatable and conversationally capable.

Built byOpenAI↗

Pricing per 1M tokens

Input Tokens

$75.00

Output Tokens

$150.00

Compare GPT-4.5

See how GPT-4.5 stacks up against other leading AI models

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Frequently Asked Questions

What is GPT-4.5?▾
GPT-4.5 is OpenAI's largest and most knowledge-rich model, designed to excel at creative, nuanced, and emotionally intelligent tasks. Unlike the reasoning-focused o-series models, GPT-4.5 was trained with a massive amount of data to develop deep world knowledge and conversational sophistication. It produces more natural, human-like responses and demonstrates improved understanding of context, tone, and subtext. The model is particularly strong at creative writing, brainstorming, open-ended exploration, and tasks requiring emotional intelligence. However, its premium pricing ($75/1M input tokens) makes it the most expensive OpenAI model, positioning it for use cases where the highest quality creative output justifies the cost. It represents OpenAI's investment in making AI more relatable and conversationally capable.
How much does GPT-4.5 cost?▾
Input pricing for GPT-4.5 is $75.00 per million tokens; output runs $150.00. Token-based pricing means you can scale up or down without a fixed commitment.
What is GPT-4.5's context window?▾
The context window for GPT-4.5 is 128K tokens. That's the maximum amount of text you can feed into a single prompt, including system instructions, conversation history, and the actual query.
Is GPT-4.5 open source?▾
GPT-4.5 is closed-source and accessible only via OpenAI's API. Proprietary models trade deployment flexibility for convenience — OpenAI handles the infrastructure.
What is GPT-4.5 best for?▾
The sweet spot for GPT-4.5 is: Creative writing, nuanced understanding, EQ tasks. If your workload fits one of these categories, it's worth benchmarking against alternatives.