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GPT-5.1 Instant

openai

A conversational variant of GPT-5 with warmer tone, improved instruction following, and adaptive reasoning. Designed for purely conversational applications rather than research.

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Capabilities

Tool Use

Image Input

PDF Input

Extended Thinking

Image Generation

Example Use Cases

Conversational applications

Improved instruction following

Quick openai responses

Technical Specifications

Context Window

128,000 tokens

Max Output

16,384 tokens

Cache Miss Cost

$1.25 per 1M tokens

Non-Reasoning Cost

$10 per 1M tokens

Cache Read Cost

$0.125 per 1M tokens

Web Search Cost

$15 per 1K calls

Code Execution Cost

$0.19 per 1K calls

⚠️ Legacy

Made legacy on

Reason

Outdated model

Recommended Replacement

GPT-5.2