OpenAI: GPT-4.5 (Preview)

Image input Text input Text output Unavailable
Author's Description

GPT-4.5 (Preview) is a research preview of OpenAI’s latest language model, designed to advance capabilities in reasoning, creativity, and multi-turn conversation. It builds on previous iterations with improvements in world knowledge, contextual coherence, and the ability to follow user intent more effectively. The model demonstrates enhanced performance in tasks that require open-ended thinking, problem-solving, and communication. Early testing suggests it is better at generating nuanced responses, maintaining long-context coherence, and reducing hallucinations compared to earlier versions. This research preview is intended to help evaluate GPT-4.5’s strengths and limitations in real-world use cases as OpenAI continues to refine and develop future models. Read more at the [blog post here.](https://openai.com/index/introducing-gpt-4-5/)

Key Specifications
Cost
+$$$$$
Context
128K
Parameters
12.8T (Rumoured)
Released
Feb 27, 2025
Speed
Ability
Reliability
Supported Parameters

This model supports the following parameters:

Logit Bias Tool Choice Seed Top P Top Logprobs Temperature Response Format Logprobs Max Tokens Presence Penalty Structured Outputs Tools Frequency Penalty Stop
Features

This model supports the following features:

Structured Outputs Response Format Tools
Performance Summary

GPT-4.5 (Preview) demonstrates exceptional performance across a range of benchmarks, positioning it as a leading model in the current AI landscape. It consistently performs in the top tier for speed, ranking in the 77th percentile across five benchmarks, indicating efficient processing. However, this premium performance is reflected in its pricing, which is positioned at the 2nd percentile, signifying it is among the most expensive models available. A standout feature is its perfect reliability, achieving the 100th percentile, meaning it consistently provides usable responses with minimal technical failures. In terms of specific benchmark results, GPT-4.5 (Preview) exhibits remarkable accuracy. It achieved 100% accuracy in both the Ethics and General Knowledge benchmarks, notably being the most accurate model at its price point and among models of similar speed in these categories. Its Reasoning capabilities are also strong, with 92% accuracy, making it the most accurate among models of comparable speed. While its Coding accuracy is solid at 90%, its Email Classification accuracy is very high at 99%. The model's key strengths lie in its superior accuracy across knowledge-based and reasoning tasks, coupled with its robust reliability and impressive speed. Its primary limitation is its premium cost, which may be a consideration for budget-sensitive applications.

Model Pricing

Current Pricing

Feature Price (per 1M tokens)
Prompt $75
Completion $150
Input Cache Read $37.5

Price History

Available Endpoints
Provider Endpoint Name Context Length Pricing (Input) Pricing (Output)
OpenAI
OpenAI | openai/gpt-4.5-preview-2025-02-27 128K $75 / 1M tokens $150 / 1M tokens
Benchmark Results
Benchmark Category Reasoning Free Executions Accuracy Cost Duration
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