Models/OpenAI/GPT-5.1

GPT-5.1

Name: GPT-5.1 API access
Brand: OpenAI

OpenAI · Proprietary · Released Nov 13, 2025 · openai/gpt-5.1

Compare Estimate cost

400K contextVisionToolsReasoningStructured outputPrompt caching

Available from 5 providersUSD / MTOK · VERIFIED 4 MINUTES AGO

EST. MONTHLY COSTclick a row for detail · click headers to sort

PROVIDER	INPUT	OUTPUT	CACHE	CONTEXT	QUANT	TTFT	TPS	UPTIME
OpenAIopenai/default/flex1ST PARTY	$0.625	$5.00	$0.063	400K	—	0.87s	75 tok/s	99.5%
OpenAIopenai/default1ST PARTY	$1.25	$10.00	$0.125	400K	—	—	—	99.5%
Azureazure	$1.25	$10.00	$0.13	400K	—	2.7s	120 tok/s	100.0%
Azureazure/swedencentral	$1.38	$11.00	$0.143	400K	—	—	—	—
OpenAIopenai/default/priority1ST PARTY	$2.50	$20.00	$0.25	400K	—	—	—	99.5%

TTFT/TPS: median (P50) over trailing 72h · chat10k profile (~10K in / 200 out) · measured via OpenRouter routing · methodology v1.1 · measured 44 hours ago

Pricing variants · USD / MTok in / out

STANDARD

$0.625 / $5.00

per MTok in / out

BATCH

$0.313 / $2.50

async batch

CACHE READ $0.063WEB SEARCH $0.01 / search

About

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. It uses adaptive reasoning...

Specifications

Context window400,000

Max output128,000

Modalities inimage, text, file

Modalities outtext

LicenseProprietary

ReleasedNov 13, 2025

TokenizerGPT

GPT-5.6 Luna Pro$0.10 / $0.60 GPT-5.6 Luna$0.10 / $0.60 GPT-5.6 Terra Pro$1.00 / $6.00 GPT-5.6 Terra$1.00 / $6.00

Embed badge

[![GPT-5.1](https://modelindex.ai/badge/openai/gpt-5.1)](https://modelindex.ai/models/openai/gpt-5.1)

Sources

OpenRouter API4 minutes ago

AGGREGATOR

LiteLLM dataset4 minutes ago

AGGREGATOR

ModelIndex benchmarks44 hours ago

MEASURED

Verified 4 minutes ago · list prices, not negotiated rates.