Julia 1

Julia 1 is Supersonic Labs' first open-weights decision model: a 144M-parameter multilingual encoder that answers typed yes/no, choice and score questions about a piece of state in one forward pass.

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input · usd / 1m tok

$0.025

output · usd / 1m tok

$0.00free

context window

8.19ktokens

modalities · in → out

pricing

base api ratesusd per 1m tokens

input: $0.025
output: $0.00 free

providers

Impossibl hosts Julia 1. Impossibl routes your request intelligently and handles failover automatically when a provider is down.

Impossibl

specifications

takes text in, gives typed answers outsupersoniclabs/julia-1

creatorSupersonic Labs
model typeEvaluation
context window8,192 tokens
maximum outputnot published
input
takes text in, gives typed answers out
outputtyped answers with probabilities
tool callingnot supported
releasedsep 23, 2026
endpoint/v1/systemone

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 results are not available for this model yet.

compare Julia 1 with other models

best-ranked of the same typeusd / 1m tok · in / out

openai/gpt-6-luna-decisions$0.10 / $0.00compare →
convaiinnovations/laya-multilingual$0.00 / $0.00compare →

impossibl models --all →

frequently asked questions

What is Julia 1?

Julia 1 is Supersonic Labs' first open-weights decision model: a 144M-parameter multilingual encoder that answers typed yes/no, choice and score questions about a piece of state in one forward pass. It is built for classification and routing over options you supply, and is most accurate when every option carries a short descriptive sentence.

How much does Julia 1 cost?

Julia 1 costs $0.025 per million input tokens and $0.00 per million output tokens through the Impossibl API. All rates are in USD.

view the pricing table ↑

What is the context length of Julia 1?

Julia 1 has a 8,192-token context window through the Impossibl API.

Does Julia 1 support tool calling?

No. Julia 1 does not support tool calling through the Impossibl API.

What inputs and outputs does Julia 1 support?

Julia 1 accepts text as input. Julia 1 returns typed answers with probabilities.

How do I use Julia 1 through an API?

Julia 1 is available through the Impossibl API. Use supersoniclabs/julia-1 as the model identifier with /v1/systemone. The quickstart explains how to create an API key and send your first request.

follow the api quickstart →

When was Julia 1 released?

Supersonic Labs released Julia 1 on September 23, 2026.

Creator release announcement ↗

this page describes Julia 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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