How much does GPT-5.1 cost per 1M tokens?

GPT-5.1 is priced at $1.25 per 1M input tokens and $10.00 per 1M output tokens on openrouter. This is a stored listed price and may differ from current provider terms; no source link is stored, so check the provider pricing page before making a decision.

Who provides GPT-5.1?

GPT-5.1 is provided by OpenAI. ModelPriceLab also tracks third-party platforms that resell or proxy this model.

What does the price record timestamp mean?

It shows when ModelPriceLab's stored record changed. It is not an independent source-verification timestamp; confirm current pricing with the provider or platform.

ModelPriceLab

Public data feed

OpenAI

GPT-5.1 pricing

Compare stored list-price records, context window, and recent API changes. Source links are shown where available; verify current provider terms before deciding.

Input / 1M Tokens

$1.25

Output / 1M Tokens

$10.00

Context window

—

Record updated 2026-08-12 · openrouter

Model details Vendor API pricing Related API changes Check stack cost impact OpenAI pricing page

Pricing per platform

Same model, different platforms. Cached input prices apply when supported.

Platform	Region	Input / 1M	Output / 1M	Cached input	Context
official View source	global	-	-	-	—
openrouter No source link stored	global	$1.25	$10.00	$0.13	—

Price history

Stored record history where available. Timestamps reflect database updates, not independent source verification.

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Monthly Input (Millions)

Monthly Output (Millions)

Cache Hit Ratio20%

Percentage of input tokens that match cached context.

Lowest listed-rate estimate

GPT-5.1

OpenAI

$15.13/mo

Monthly cost comparison

OpenAI

GPT-5.1

$15.13/mo

Input$5.00

Cached input$0.13

Output$10.00

Lowest cost in this comparison

Frequently asked questions

How much does GPT-5.1 cost per 1M tokens?: GPT-5.1 is priced at $1.25 per 1M input tokens and $10.00 per 1M output tokens on openrouter. This is a stored listed price and may differ from current provider terms; no source link is stored, so check the provider pricing page before making a decision.
Who provides GPT-5.1?: GPT-5.1 is provided by OpenAI. ModelPriceLab also tracks third-party platforms that resell or proxy this model.
What does the price record timestamp mean?: It shows when ModelPriceLab's stored record changed. It is not an independent source-verification timestamp; confirm current pricing with the provider or platform.

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OpenAI GPT-5.1 API Pricing — Token Costs & Alternatives