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GPT-5.1

by Azure Cognitive Services · family gpt · listed Nov 2025RTV

Speech generation model for controllable voice, narration, and audio delivery

Current rates USD per 1M tokens

Input$1.25

Output$10.00

Cache read$0.125

Cache write—

Against the market

Input price vs. maker flagships ($/1M tokens)

Output price vs. maker flagships ($/1M tokens)

On the record

Model id: gpt-5.1
Context window: 272K tokens
Max output: 128K tokens
Input modalities: text, image, audio
Output modalities: text, image, audio
Reasoning: yes
Tool calls: yes
Open weights: no
Knowledge cutoff: Sep 2024
Released: 2025-11-14
Last updated: 2025-11-14
Provider docs: learn.microsoft.com/en-us/azure/ai-services/openai/concepts/models

Back of the envelope

Input M tokensOutput M tokens

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