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OpenAI

GPT-5 Chat (latest) API

OpenAI
About

Build advanced reasoning agents with GPT-5 Chat (latest), a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $1.25/1M input and $10.00/1M output tokens. Access GPT-5 Chat (latest) via the OpenAI API with up to 128K output tokens.

Capabilities

Input Modalities

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Output Modalities

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Reasoning
Yes
Structured Output
Yes
Tool Use
No
WeightsClosed
Temperature
Adjustable
Attachment
Supported
Limits
Context Window
400K

Tokens

Input Limit
272K

Tokens

Max Output
128K

Tokens

Pricing

Standard (per 1M tokens)

Input
$1.25
Output
$10.00
Frequently Asked Questions

GPT-5 Chat (latest) by OpenAI costs $1.25 per 1M input tokens and $10.00 per 1M output tokens.

Model Details
ID
gpt-5-chat-latest
Provider
OpenAI
Family
gpt-codex
Release Date
Aug 7, 2025
Knowledge Cutoff
Sep 30, 2024
API Integration
NPM Package
@ai-sdk/openai
Environment Variables
OPENAI_API_KEY
Documentation