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:

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

This model supports the following features:

Response Format Tools Structured Outputs
Performance Summary

OpenAI's GPT-4.5 (Preview) demonstrates strong performance as a research preview, excelling in several key areas. The model performs among the fastest, typically ranking in the top tier for speed (79th percentile across benchmarks). However, this advanced capability comes with premium pricing, positioning it at the 2nd percentile for cost. A standout feature is its exceptional reliability, achieving a perfect 100% success rate across all benchmarks, indicating minimal technical failures and consistent response delivery. In terms of benchmark results, GPT-4.5 (Preview) achieved perfect 100.0% accuracy in both General Knowledge and Ethics, often being the most accurate model at its price point and speed. While its accuracy in Email Classification was 99.0% (70th percentile) and Coding was 90.0% (72nd percentile), these scores still represent robust performance. The model's strengths lie in its ability to handle complex reasoning and ethical scenarios with high precision, alongside its strong general knowledge. Its primary limitation appears to be its premium cost, which may be a consideration for some applications. Overall, GPT-4.5 (Preview) showcases significant advancements in coherence, intent following, and reduced hallucinations, making it a powerful tool for open-ended thinking and problem-solving.

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 Strategy Free Executions Accuracy Cost Duration
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