OpenAI API exposes GPT-4.5 through model ID gpt-4-5. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.
Last refreshed 2026-05-20. Next refresh: weekly.
Quick Start
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Code Examples
Install
pip install openaiAPI key
OPENAI_API_KEYModel ID
gpt-4-5Use the model slug directly, e.g. "gpt-4o" or "gpt-4.1-mini".
import os
from openai import OpenAI
client = OpenAI() # reads OPENAI_API_KEY from env
response = client.chat.completions.create(
model="gpt-4-5",
messages=[{"role": "user", "content": "Hello"}]
)
print(response.choices[0].message.content)Pricing on OpenAI API
Capabilities
VisionMultimodalJSON / Tool useStructured OutputsCode ExecutionFine-tuning
About GPT-4.5
Improved GPT-4 variant released March 2026. Enhanced performance over GPT-4o with better reasoning and code generation.
Model Specs
Released2025-02-27
Context8k
Knowledge cutoff2025-04