Mistral Large 4 vs GPT-6 Astra

rates, context and capabilities side by side on the impossibl api, and what the same workload costs on each.

the models at a glance: base rates, context window and modalities
specificationMistral Large 4

mistral/mistral-large-4

GPT-6 Astra

openai/gpt-6-astra

input · usd / 1m tok$0.68$10.00
output · usd / 1m tok$2.09$50.00
context window524.29ktokens1.05mtokens
modalities · in → out

takes text and image in, gives text out

takes text and image in, gives text out

pricing

base api rates by model
base api rates · usd per 1m tokensMistral Large 4

mistral/mistral-large-4

GPT-6 Astra

openai/gpt-6-astra

input$0.68$10.00over 272k · $20.00
output$2.09$50.00over 272k · $75.00
cache read$0.07$1.00over 272k · $2.00
cache write · default ttlnot published$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. the estimate below prices one workload at these rates on every model.

specifications

published specifications by model
as publishedMistral Large 4

mistral/mistral-large-4

GPT-6 Astra

openai/gpt-6-astra

creatorMistralOpenAI
model typeText generationText generation
context window524,288tokens1,050,000tokens
input

takes text and image in, gives text out

takes text and image in, gives text out

outputtexttext
tool callingnot verifiednot verified
releasedoct 6, 2026sep 3, 2026
endpoint/v1/chat/completions/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.

benchmarks

benchmark scores by model, primary tested configuration
primary configurationMistral Large 4

mistral/mistral-large-4

GPT-6 Astra

openai/gpt-6-astra

intelligence index · gateway rank38.4#31 of 10852.7#4 of 108
omniscience-5.3#42 of 84not measured
humanity’s last exam35.0%#36 of 87
not measured
coding indexnot measured76.9#4 of 64
agentic indexnot measured51.0#7 of 53
aa-lcr81.3%
not measured
mmmu-pro76.4%
not measured
automationbench partial59.9%
not measured
scicode54.2%
not measured
gdp.pdf all-pass18.6%
not measured
critpt10.6%
not measured
harvey lab3.1%
not measured

Mistral Large 4 source ↗GPT-6 Astra source ↗

each column describes the tested configuration named under the model; performance and costs can differ on impossibl. a score one model was not measured on is left blank rather than scored zero. indices are ranked against every model on the gateway with one. last checked 2026-10-14.

estimate your cost

one token workload, priced on every model at the published rates, in usd. change the numbers to match yours.

token workload

total input, including cached tokens

include billable reasoning tokens

the same token usage in each request

a subset of total input, never additional tokens

Mistral Large 4

mistral/mistral-large-4

estimated usage cost

$1.725

1,000 requests × (1,000 uncached input × $0.68 + 500 output × $2.09) / 1,000,000 = $1.725

base rates; no context pricing tiers are published.

GPT-6 Astra

openai/gpt-6-astra

estimated usage cost

$35.00

1,000 requests × (1,000 uncached input × $10.00 + 500 output × $50.00) / 1,000,000 = $35.00

base rates: up to 272,000 input tokens per request, inclusive.

estimates use published impossibl api usage rates. configured billing adjustments, funding fees, taxes, and custom workspace rates are excluded and may change the final amount.

image and audio usage, cache creation, and additional tool charges are excluded. reasoning tokens count as billable output, even when they are not visible in the response.

summary

Mistral Large 4 and GPT-6 Astra are available through the Impossibl API. they share the /v1/chat/completions endpoint; the model identifier selects the model for a request.

Mistral Large 4 is created by Mistral. It has a 524,288-token context window. Base API pricing (USD): $0.68 per million input tokens; $2.09 per million output tokens.

GPT-6 Astra is created by OpenAI. It has a 1,050,000-token context window. Base API pricing (USD): $10.00 per million input tokens; $50.00 per million output tokens. Above 272,000 input tokens per request, context-tier rates apply to the whole request.

Mistral Large 4 →GPT-6 Astra →

this page compares Mistral Large 4 vs 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.

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