OpenAI: GPT-5.1

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...

‡Kilo Code Leaderboard†OpenRouter
Context Window
400,000 tokens
Max Output
128,000 tokens
Input Modalities
imagetextfile

Real-World Usage

Real-world usage statistics from the Kilo Code community

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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
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
$0.13 per 1M tokens
Content Moderation
Enabled

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