How much does GPT-5.1 Chat cost?

GPT-5.1 Chat costs $1.25 per million input tokens and $10.00 per million output tokens. For a typical conversation (~2,000 tokens), that's approximately $0.013 per message.

What benchmarks has GPT-5.1 Chat been tested on?

GPT-5.1 Chat has not been benchmarked yet. Scores are added as benchmarks are published.

Is GPT-5.1 Chat open source?

No, GPT-5.1 Chat is a proprietary model by OpenAI.

How does GPT-5.1 Chat compare to 3b De Ft Research_release?

GPT-5.1 Chat has an average score of 0.0 while 3b De Ft Research_release scores 0.0. 3b De Ft Research_release slightly outperforms GPT-5.1 Chat overall. See full comparison →

Home/Models/GPT-5.1 Chat

GPT-5.1 Chat

Name: GPT-5.1 Chat
Price: 1.25 USD
Author: OpenAI

by OpenAI · Released Nov 2025

Multimodal

Compare

Context

128K tokens (~64 books)

Input $/1M

$1.25

Output $/1M

$10.00

Type

multimodal

License

Proprietary

Benchmarks

0 tested

Data updated today

About

GPT-5.1 Chat (AKA Instant is the fast, lightweight member of the 5.1 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on...

No benchmark data available yet.

Model Family · OpenAI GPT-5.1

GPT-5.1Nov 2025

49.6

$1.25/M in400Kctx24 benchmarks

GPT-5.1 ChatNov 2025

$1.25/M in128Kctx(-272K)

GPT-5.1-CodexNov 2025

68.6+68.6

$1.25/M in400Kctx(+272K)8 benchmarks

GPT-5.1-Codex-MaxDec 2025

72.0+3.4