GPT-4.1

GPT-4.1 is OpenAI's flagship of the GPT-4.1 series, optimised for advanced instruction following, real-world software engineering, and long-context reasoning.

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input · usd / 1m tok

$2.00

output · usd / 1m tok

$8.00

context window

1mtokens

modalities · in → out

pricing

base api ratesusd per 1m tokens

input: $2.00
output: $8.00
cache read: $0.50

providers

OpenAI hosts GPT-4.1. Impossibl routes your request intelligently and handles failover automatically when a provider is down.

OpenAI

specifications

takes text and image in, gives text outopenai/gpt-4.1

creatorOpenAI
model typeText generation
context window1,000,000 tokens
maximum outputnot published
input
takes text and image in, gives text out
outputtext
tool callingnot verified
releasedapr 14, 2025
endpoint/v1/chat/completions

unknown means the public catalog does not establish that fact. a model's documented capabilities can differ from what a particular api supports. see the model documentation for integration details.

try it · your prompt, this model, live

# responses API
import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["IMPOSSIBL_API_KEY"],
    base_url="https://api.impossibl.com/v1",
)

resp = client.responses.create(
    model="openai/gpt-4.1",
    input="▌",
)
print(resp.output_text)

edit the prompt, then run

# responses API
import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["IMPOSSIBL_API_KEY"],
    base_url="https://api.impossibl.com/v1",
)

resp = client.responses.create(
    model="openai/gpt-4.1",
    input="▌",
)
print(resp.output_text)

edit the prompt, then run

benchmarks

intelligence index

12.7#75 of 90 models on the gateway

omniscience-39.6#74 of 86
gpqa66.6%#78 of 88
humanity’s last exam4.2%#82 of 89

AA-LCR68.3%
GPQA66.6%
MMMU-Pro61.2%
Tau247.1%
LiveCodeBench45.7%
IFBench43.0%
AIME 202534.7%
Terminal-Bench Hard13.6%
Humanity’s Last Exam4.2%
CritPt0.0%

Intelligence Index12.69
Omniscience Index-39.63
intelligence index (API)12.7

view source ↗all source data and breakdowns (json) ↗

each configuration is listed separately; these evaluations describe the tested model configuration, and performance and costs can differ on impossibl. unmeasured scores are omitted and api values keep their source units. last checked 2026-09-11.

compare GPT-4.1 with other models

frontier labs and open weights, best-ranked firstusd / 1m tok · in / out

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impossibl models --all →

frequently asked questions

What is GPT-4.1?

GPT-4.1 is OpenAI's flagship of the GPT-4.1 series, optimised for advanced instruction following, real-world software engineering, and long-context reasoning. It improves on GPT-4o across coding and instruction tasks and heads a family with mini and nano tiers for lower latency and cost.

How much does GPT-4.1 cost?

GPT-4.1 costs $2.00 per million input tokens and $8.00 per million output tokens through the Impossibl API. Cache reads cost $0.50 per million tokens. All rates are in USD.

view the pricing table ↑

What is the context length of GPT-4.1?

GPT-4.1 has a 1,000,000-token context window through the Impossibl API.

What inputs and outputs does GPT-4.1 support?

GPT-4.1 accepts text and image as input. GPT-4.1 returns text.

How do I use GPT-4.1 through an API?

GPT-4.1 is available through the Impossibl API. Use openai/gpt-4.1 as the model identifier with /v1/chat/completions. The quickstart explains how to create an API key and send your first request.

follow the api quickstart →

When was GPT-4.1 released?

OpenAI released GPT-4.1 on April 14, 2025.

Creator release announcement ↗

this page describes GPT-4.1 as listed by the impossibl public api. prices and availability come from that catalog, refreshed here every five minutes. this is an impossibl offering, not a comparison of independent hosting-provider quotes. model descriptions and release dates, where available, use the creator sources linked under the answers above.

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