OpenAI ↗Released February 27, 2025

GPT-4.5

#4 Arena RankUndisclosed parameters

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

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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?▾
GPT-4.5 costs $75.00 per 1 million input tokens and $150.00 per 1 million output tokens. Pricing is based on token usage, making it cost-effective for both small and large-scale applications.
What is GPT-4.5's context window?▾
GPT-4.5 has a context window of 128K tokens. This determines how much text the model can process in a single request — larger context windows allow the model to handle longer documents, maintain more conversation history, and reason over bigger codebases.
Is GPT-4.5 open source?▾
No, GPT-4.5 is a proprietary model available through OpenAI's API. Proprietary models are typically accessible via API endpoints and offer managed infrastructure, support, and regular updates from the provider.
What is GPT-4.5 best for?▾
GPT-4.5 is best suited for: Creative writing, nuanced understanding, EQ tasks. These use cases leverage the model's specific strengths in terms of capability, speed, and cost-effectiveness within OpenAI's model lineup.