gpt-5.1-plus

gpt-5.1-plus

The gpt-5.1 model in the ChatGPT Plus
2025-11-13
LLM
Model capability: imageModel capability: function_call
Input:
$1.25/1M tokens
Output:
$10/1M tokens
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API Overview

GPT-5.1-Plus is an iterative version based on GPT-5, featuring "fast response + a more natural conversation experience." It delivers comprehensive upgrades in response speed, instruction adherence, and conversational tone, with the official claim that it feels "warmer and smarter," making it especially suited for high-frequency interaction scenarios such as daily chats, summarization, Q&A, lightweight reasoning, and customer service bots. Compared to the previous GPT-5 version, it can execute user instructions more accurately (e.g., strictly controlling word count) and offers a tone that closely mirrors human speech.

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API Analytics

API Reference (4)

API DescriptionAPI EndpointRequest MethodStabilityParameter Description
Chat(Talk)
POST
Stable
View Details
Chat (Image Analysis)
POST
Stable
View Details
Chat (Structured Output)
POST
Stable
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Chat (function call)
POST
Stable
View Details

API Pricing

$
ModelDescriptionContextOfficial Price302.AI Price

gpt-5.1-plus

-
400000

Input$1.25 / 1M tokens
Output$10 / 1M tokens

Input$1.25/ 1M tokens
Output$10/ 1M tokens
Original Price