Overview

GPT-5 is OpenAI’s most intelligent model yet, and it brings major gains across reasoning, reliability, and specialized use cases.

• Dynamic reasoning (“think hard about this”) enables expert-level responses on complex tasks
• Much better at complex front-end generation
• Best model yet for health-related questions
• Significant reductions in hallucinations (~80% less with thinking mode vs. o3)

It supports a 400,000 token context window and up to 128,000 output tokens

Earlier iterations of this model were available as Horizon Alpha and Horizon Beta

SWE-Bench Verified (500 turns)

Model	Accuracy
Open AI GPT-5	74.9%
Claude Sonnet-4	70.4%
Qwen3-Coder	69.6%
OpenAI o3	69.1%

Model Variants

Model	Best for
GPT-5	Complex reasoning, broad world knowledge, and code-heavy tasks
GPT-5-mini	Balanced performance: cost-optimized chat, decent reasoning, fast speed
GPT-5-nano	High-throughput use cases like classification or simple Q&A

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Pricing

Prices shown per 1M tokens:

GPT-5

• Input: $1.25
• Output: $10.00

GPT-5 Mini

• Input: $0.25
• Output: $2.00

GPT-5 Nano

• Input: $0.05
• Output: $0.40

GPT-5 Chat

• Input: $1.25
• Output: $10.00

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Quick Links

• Check out our X post
• Official blog post from OpenAI: Introducing GPT-5

Note:

• OpenAI requires bringing your own API key to use GPT-5 over the API. Set up here: Integrations
• The free Horizon Alpha and Beta endpoints are now retired.