GPT-5.1

Deprecated

An OpenAI model with a 400K-token context window, image input and tool calling. On the OpenAI API since November 13, 2025, now deprecated.

Access details: OpenAI API

An alias. The provider can point it at a newer version.

gpt-5.1

Updated Sep 23, 2026

Sources & notes

Capabilities & limits

Context window: 400K
Maximum output: 128K
Image input: Supported
Tool calling: Supported
Structured output: Supported

Pricing

USD / 1M tokens

Input: $1.25
Output: $10.00

Standard rates per million tokens. Discounts and long-context rates, where offered, are on OpenAI's pricing page.

Full rate card 3 rates

All prices in USD.

Standard input

$1.25 per 1M tokens

Standard output

$10.00 per 1M tokens

Cached input

$0.125 per 1M tokens

Other tiers per 1M tokens (short context): Batch: $0.625 input / $5 output / $0.0625 cached; Flex: $0.625 input / $5 output / $0.0625 cached; Fast mode: $2.5 input / $20 output / $0.25 cached.

Price history

Sep 23, 2026

Input $1.25 per million tokens

Sep 23, 2026

Output $10.00 per million tokens

Technical details

Parameters: Not published
Active parameters: Not published
Architecture: Not published
Training / knowledge cutoff: Sep 30, 2024
Input modalities: Text, image
Output modalities: Text

From OpenAI

Official announcement ↗

Release & lifecycle

First available: Nov 13, 2025
available: As of Sep 23, 2026
deprecated: As of Oct 20, 2026