OpenAI: GPT-5.1

by openai

GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5. It uses adaptive reasoning to allocate computation dynamically, responding quickly to simple queries...

57.5 Coding Index*#16 Code Mode‡103.1 tokens/sec*$1.25/1M input tokens†
*Artificial Analysis‡Kilo Code Leaderboard†OpenRouter
Release Date
November 13, 2025
Context Window
400,000 tokens
Max Output
128,000 tokens
Input Modalities
imagetextfile

Coding Performance

Coding benchmarks and performance metrics for development tasks

Coding Benchmarks

Artificial Analysis Coding Index

57.5%

Overall coding capability score

LiveCodeBench

86.8%

Real-world coding task performance

SciCode

43.3%

Scientific computing & algorithms

TerminalBench Hard

42.6%

CLI & terminal command generation

LCR (Long Context Reasoning)

75.0%

Understanding large codebases

IFBench

72.9%

Instruction following accuracy

Speed & Efficiency

Output Speed

103.1 tokens/sec

Median output tokens per second

Performance metrics from Artificial Analysis

Real-World Usage

Real-world usage statistics from the Kilo Code community

Weekly Token Usage

Mode Rankings (Last Week)

Where this model ranks for each built-in mode

Architect

Plan and design before implementation

#14

Code

Write, modify, and refactor code

#16

Ask

Get answers and explanations

#14

Debug

Diagnose and fix software issues

#15

Orchestrator

Coordinate tasks across multiple modes

#11

Real-world metrics from the Kilo Code Leaderboard

Pricing

Cost per 1 million tokens

Input Tokens
$1.25
per 1M tokens
Output Tokens
$10.00
per 1M tokens

Example Cost

Analyzing a 10,000 line codebase (≈40k input tokens, 10k output tokens) costs approximately $0.1500

Coding Capabilities

Features and parameters relevant to coding tasks

Coding Features

Function Calling
Can call external functions/APIs
Tool Choice
Control over function selection
Structured Outputs
JSON schema validation
Reasoning Tokens
Extended thinking for complex problems

Pricing details from OpenRouter

Technical Details

Architecture and implementation specifications

Model ID
openai/gpt-5.1
Artificial Analysis Slug
gpt-5-1
Created
November 13, 2025
Tokenizer
GPT
Input Modalities
image, text, file
Context Window
400,000 tokens
Max Completion Tokens
128,000 tokens
Input Price
$1.25 per 1M tokens
Output Price
$10.00 per 1M tokens
Cache Read Price
$0.00 per 1M tokens
Content Moderation
Enabled

Ready to try OpenAI: GPT-5.1?

Install Kilo Code and start using OpenAI: GPT-5.1 for your coding projects today. Choose from 400+ AI models with complete freedom.