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

Example Use Cases

Conversational applications

Improved instruction following

Quick openai responses

Technical Specifications

Context Window

128,000 tokens

Max Output

16,384 tokens

Input Cost

$1.25 per 1M tokens

Output Cost

$10 per 1M tokens

Cache Read Cost

$0.125 per 1M tokens

Web Search Cost

$15 per 1K calls

⚠️ Deprecated

Deprecated on

Reason

Outdated model

Recommended Replacement

GPT-5.2

Availability

Free

Minimum plan required

$0 per month

Also available in these plans

Plus
$20/mo
Pro
$100/mo
Super
$200/mo