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GPT-5.1

OpenAI
Announcement
GPT-5.1 launch post cover

Cost/1M tokens

input
$1.25
cached
$0.125
output
$10.00
Context
400Ktokens
Released
12mo ago

Specifications

Model

Developer
OpenAI
Family
GPTGPT-5.1
Type
Language model
Released
November 13, 2025
Model ID
openai/gpt-5.1

Capabilities

Input → output
Image, text, file → Text
Max output
128K tokens
Tokenizer
GPT
Knowledge cutoff
2024-09-30

Weights

Openness
Closed

Sources:models.devOpenRouter

Metadata synced Nov 12, 2026, 12:17 PM UTC

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