GPT-6 Astra

GPT-6 Astra is OpenAI's flagship model, built for the hardest end-to-end work across complex reasoning, coding, computer use, research, and document creation.

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input · usd / 1m tok

$10.00

output · usd / 1m tok

$50.00

context window

1.05mtokens

modalities · in → out

pricing

base api ratesusd per 1m tokens

input: $10.00over 272k · $20.00
output: $50.00over 272k · $75.00
cache read: $1.00over 272k · $2.00
cache write · default ttl: $12.50over 272k · $25.00

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

Different companies host GPT-6 Astra. Impossibl routes your request intelligently and handles failover automatically when a provider is down.

Azure AI Foundry
OpenAI

specifications

takes text and image in, gives text outopenai/gpt-6-astra

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
releasedsep 3, 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-6-astra",
    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-6-astra",
    input="▌",
)
print(resp.output_text)

edit the prompt, then run

benchmarks

intelligence index

52.7#4 of 108 models on the gateway

coding index76.9#4 of 64
agentic index51.0#7 of 53

Intelligence Index52.67
legal index (API)58.5
coding index (API)76.9
agentic index (API)51
economics index (API)59.8
engineering index (API)54.7
intelligence index (API)52.7
strategy and ops index (API)57.3
finance and accounting index (API)55.2
healthcare and medical index (API)51.7

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 2026-10-14.

compare GPT-6 Astra 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-6 Astra?

GPT-6 Astra is OpenAI's flagship model, built for the hardest end-to-end work across complex reasoning, coding, computer use, research, and document creation. It accepts text and image input, offers configurable reasoning effort up to a max setting, and pairs with web search, file search, code execution, and shell tools.

How much does GPT-6 Astra cost?

GPT-6 Astra costs $10.00 per million input tokens and $50.00 per million output tokens through the Impossibl API. Cache reads cost $1.00 per million tokens; cache writes cost $12.50 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-6 Astra?

GPT-6 Astra has a 1,050,000-token context window through the Impossibl API.

What inputs and outputs does GPT-6 Astra support?

GPT-6 Astra accepts text and image as input. GPT-6 Astra returns text.

How do I use GPT-6 Astra through an API?

GPT-6 Astra is available through the Impossibl API. Use openai/gpt-6-astra 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-6 Astra released?

OpenAI released GPT-6 Astra on September 3, 2026.

Creator release announcement ↗

this page describes GPT-6 Astra 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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