GPT-5 Pro

GPT-5 Pro is the high-compute version of OpenAI's GPT-5, aimed at the hardest problems in reasoning, coding, and analysis.

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input · usd / 1m tok

$15.00

output · usd / 1m tok

$120.00

context window

400ktokens

modalities · in → out

pricing

base api ratesusd per 1m tokens

input: $15.00
output: $120.00

providers

Different companies host GPT-5 Pro. Impossibl routes your request intelligently and handles failover automatically when a provider is down.

Azure OpenAI
OpenAI

specifications

takes text and image in, gives text outopenai/gpt-5-pro

creatorOpenAI
model typeText generation
context window400,000 tokens
maximum outputnot published
input
takes text and image in, gives text out
outputtext
tool callingnot verified
releasedaug 7, 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-5-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-pro",
    input="▌",
)
print(resp.output_text)

edit the prompt, then run

benchmarks

benchmark results are not available for this model yet.

compare GPT-5 Pro with other models

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

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frequently asked questions

What is GPT-5 Pro?

GPT-5 Pro is the high-compute version of OpenAI's GPT-5, aimed at the hardest problems in reasoning, coding, and analysis. It uses extended thinking to give more accurate and precise answers than base GPT-5 and is available through the Responses API for tasks where quality outweighs latency.

How much does GPT-5 Pro cost?

GPT-5 Pro costs $15.00 per million input tokens and $120.00 per million output tokens through the Impossibl API. All rates are in USD.

view the pricing table ↑

What is the context length of GPT-5 Pro?

GPT-5 Pro has a 400,000-token context window through the Impossibl API.

What inputs and outputs does GPT-5 Pro support?

GPT-5 Pro accepts text and image as input. GPT-5 Pro returns text.

How do I use GPT-5 Pro through an API?

GPT-5 Pro is available through the Impossibl API. Use openai/gpt-5-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 Pro released?

OpenAI released GPT-5 Pro on August 7, 2025.

Creator release announcement ↗

this page describes GPT-5 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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