OpenAI: GPT-5.1

Name: OpenAI: GPT-5.1
Author: OpenRouter

deprecatedproprietary

GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5.

Intelligence

Reasoning

Speed

Context

400K

Max output

128K

Input price

$1.25/1M tokens

Output price

$10/1M tokens

Capabilities

Show unsupported (2)

Reasoning & Interaction

Reasoning

Tool Calling

Output Control

Structured Output

JSON Mode

Infrastructure

Streaming

Batch Processing

Details

Model IDopenai/gpt-5.1

ProviderOpenRouter

CreatorOpenAI

Familygpt-5.1

Licenseproprietary

Statusdeprecated

Typechat

Input modalitiesimage, text

Output modalitiestext

Open weightNo

Parameters—

Architecture—

Context window400K tokens

Max input—

Max output128K tokens

Reasoning tokensYes

Knowledge cutoff2024-09

Release date2025-11-13

Deprecation date2026-10-01

Sourceofficial

Tools

Function Callingfunction_calling

Call external functions and APIs

Pricing

Input

$1.25

Output

$10

Cache write

—

Cache read

$0.13

Batch in

—

Batch out

—

Family Comparison: gpt-5.1

Model	Caps	Perf	Speed	Context	Max out	Pricing
OpenAI: GPT-5.1-Codex-Mini	RTJJMS	—	—	400K	128K	$0.25$2
OpenAI: GPT-5.1 (batch)	RTJJM	—	—	400K	128K	$0.63$5
OpenAI: GPT-5.1 Chat	TJJM	—	—	128K	32K	$1.25$10
OpenAI: GPT-5.1-Codex-Max	RTJJMS	—	—	400K	128K	$1.25$10
OpenAI: GPT-5.1-Codex	RTJJMS	—	—	400K	128K	$1.25$10
OpenAI: GPT-5.1	RTJJMSB	—	—	400K	128K	$1.25$10

API

GET/v1/models/openrouter/openai/gpt-5.1

OpenAI: GPT-5.1

deprecated

openai/gpt-5.1

GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5.

Changes · 6 entries

openai/gpt-5.1updateca7a400Nov 2, 2026, 03:02 AM

pricingcached input$0.13→$0.125

openai/gpt-5.1update20c73acJul 17, 2026, 02:34 AM

pricingcached input$0.13→$0.125

openai/gpt-5.1update14e5cfdApr 13, 2026, 02:40 AM

pricingcached input$0.125→$0.13

openai/gpt-5.1update1cd659eMar 24, 2026, 04:19 AM

capabilitiesjson modeyes

openai/gpt-5.1update2b100acMar 23, 2026, 05:30 AM

model_typechat

release_date2025-11-13

taglineGPT-5.1 is the latest frontier-grade model in the GPT-5 s...

tools["function_calling"]

openai/gpt-5.1create7f5c66fMar 21, 2026, 05:16 AM