LLMs

GPT-4.5 Preview API

GPT-4.5 Preview is OpenAI's latest general-purpose AI model optimized for sophisticated conversational interactions and contextually rich problem-solving. The model supports applications requiring interactive dialogues, detailed analytical reasoning, in-depth question answering, and context-sensitive content creation.

1RPC.ai1RPC.ai
Reasoning
Speed
$75.00/$150.00
Input/Output
128,000Context Window

GPT-4.5 Preview

GPT-4.5 Preview is a mid-sized, high-performance multimodal model from OpenAI, released in early 2025. Designed to balance power and efficiency, it supports both text and image inputs and is available through ChatGPT and the API.

Offering significant improvements over GPT-4 Turbo in speed, quality, and cost, GPT-4.5 Preview enables smoother workflows across reasoning, coding, and visual understanding tasks. It supports a context window of up to 128,000 tokens and is well-suited for creative, technical, and general-purpose use cases.

What it’s optimized for

GPT-4.5 Preview is engineered for broad, capable reasoning:

  • High-accuracy natural language understanding and generation

  • Code generation and debugging across multiple languages

  • Multimodal comprehension of images, charts, and diagrams

  • Faster and more reliable responses in interactive applications

Typical use cases

GPT-4.5 Preview is ideal for:

  • Technical Q&A, legal analysis, or complex summarization

  • Writing and editing assistance with improved instruction following

  • Python and TypeScript coding (via tool usage in the playground or API)

  • Interpreting image-based prompts, diagrams, and visual content

  • Enhancing customer service, education, and product interfaces

Key characteristics

  • Supports both text and images in the same prompt

  • Optimized for real-time usage in tools and embedded applications

  • Handles up to 128K tokens, with enhanced coherence across long inputs

  • Improved accuracy in reasoning and following instructions

Model architecture

GPT-4.5 Preview is part of the GPT-4 family but trained with further architectural improvements and alignment tuning. While still considered a general-purpose transformer model, it incorporates efficiency optimizations and better tool-handling across the OpenAI toolchain (e.g., Python, DALL·E, browser, code interpreter).

Why choose 1RPC.ai for GPT-4.5 Preview

  • Every call is directly tied to the exact model and version used, ensuring traceability and trust in your outputs

  • Execution runs inside hardware-backed enclaves, so the relay can’t access or log your request

  • Connect to multiple AI providers through a single API

  • Avoid provider lock-in with simple, pay-per-prompt pricing

  • Privacy by design with our zero-tracking infrastructure that eliminates metadata leakage and protects your activity

Summary

GPT-4.5 Preview represents a step up in performance and usability for teams looking to combine strong reasoning, image understanding, and low-latency interaction. It strikes a practical balance between capability and cost, making it a go-to model for both enterprise integrations and user-facing AI applications.

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Implement

Get started with an API-friendly relay

Send your first request to verified LLMs with a single code snippet.

import requests
import json
response = requests.post(
    url="https://api.1rpc.ai/v1/chat/completions",
    headers={
        "Authorization": "Bearer <1RPC_AI_API_KEY>",
        "Content-type": "application/json",
    },
    data=json.dumps({
        "model": "gpt-4.5-preview",
        "messages": [
            {
                "role": "user",
                "content": "What is the meaning of life?"
            }
        ]
    })
)
print(response.json())
Pricing

Estimate Usage Across Any AI Model

Adjust input and output size to estimate token usage and costs.

GPT-4.5 Preview Token Costs Calculator

≈ 7,500 words
≈ 75,000 words
$15.7500Total cost per million tokens
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