Activefrontierllm Proprietary

GPT-4.5

by OpenAI· Released February 2025· Cutoff October 2023

GPT-4.5 is OpenAI's largest and most capable language model, designed for complex reasoning, creative tasks, and nuanced conversation. It builds on GPT-4 with improved knowledge, emotional intelligence, and reduced hallucinations, while maintaining broad general-purpose performance.

Official Site API Docs

Input cost

$75.00 per 1M tokens

Output cost

$150.00 per 1M tokens

Context window

128K tokens

Max output

16384 tokens

Modalities

text

License

proprietary

Capabilities

Function CallingCode GenerationStreamingJSON ModeSystem MessagesParallel Tool CallsStructured OutputsContext Caching

Best For

Complex reasoning, creative writing, and tasks requiring high accuracy and nuanced understanding.

Strengths

Highest accuracy and reasoning among OpenAI models
Reduced hallucination rate compared to GPT-4
Superior emotional intelligence and conversational nuance
Strong performance on creative and open-ended tasks

Limitations

Very high cost compared to other models
Slower inference speed due to large size
Not available in all regions or tiers
No native vision or multimodal support

Use Cases

Advanced research and analysis

Complex code generation and debugging

High-stakes content creation and editing

Customer support with nuanced understanding

Legal and medical document review

Creative writing and storytelling

Data analysis and report generation

Improvements Over Previous Model

Reduced hallucination rate compared to GPT-4
Improved emotional intelligence and conversational nuance
Higher accuracy on complex reasoning benchmarks
Larger knowledge base and broader general knowledge
Better at following nuanced instructions
Enhanced creative writing capabilities

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