GPT-5.4 Pro

GPT-5.4 Pro is the high-compute version of OpenAI's GPT-5.4, built to tackle tough problems on complex, high-stakes tasks.

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input · usd / 1m tok

$30.00

output · usd / 1m tok

$180.00

context window

1.05mtokens

modalities · in → out

pricing

base api ratesusd per 1m tokens

input: $30.00over 272k · $60.00
output: $180.00over 272k · $270.00
cache read: $3.00over 272k · unknown

brackets are by input tokens per request: a request over a threshold is billed at that bracket's rates for all of its tokens. cache creation can have a separate charge.

providers

OpenAI hosts GPT-5.4 Pro. 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-5.4-pro

creatorOpenAI
model typeText generation
context window1,050,000 tokens
maximum outputnot published
input
takes text and image in, gives text out
outputtext
tool callingnot verified
releasedmar 5, 2026
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-5.4-pro",
    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-5.4-pro",
    input="▌",
)
print(resp.output_text)

edit the prompt, then run

benchmarks

CritPt30.0%

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 2026-09-10.

compare GPT-5.4 Pro 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-5.4 Pro?

GPT-5.4 Pro is the high-compute version of OpenAI's GPT-5.4, built to tackle tough problems on complex, high-stakes tasks. It uses more compute to think harder and give consistently more precise answers than base GPT-5.4, and it is available only through the Responses API.

How much does GPT-5.4 Pro cost?

GPT-5.4 Pro costs $30.00 per million input tokens and $180.00 per million output tokens through the Impossibl API. Cache reads cost $3.00 per million tokens. These base rates apply through 272,000 total input tokens per request. Above 272,000 input tokens, the long-context rates in the pricing table apply to the whole request. All rates are in USD.

view the pricing table ↑

What is the context length of GPT-5.4 Pro?

GPT-5.4 Pro has a 1,050,000-token context window through the Impossibl API.

What inputs and outputs does GPT-5.4 Pro support?

GPT-5.4 Pro accepts text and image as input. GPT-5.4 Pro returns text.

How do I use GPT-5.4 Pro through an API?

GPT-5.4 Pro is available through the Impossibl API. Use openai/gpt-5.4-pro 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-5.4 Pro released?

OpenAI released GPT-5.4 Pro on March 5, 2026.

Creator release announcement ↗

this page describes GPT-5.4 Pro 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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