# Supersonic Labs API Models, Pricing and Capabilities Canonical HTML page: [Supersonic Labs API Models, Pricing and Capabilities]() Markdown alternative: [Supersonic Labs API Models, Pricing and Capabilities as Markdown]() Access 1 model from Supersonic Labs through the Impossibl API, including Julia 1. Compare pricing per million tokens, context windows, and capabilities between different Supersonic Labs models. Select two or three models to [compare specifications and API costs](). Model types and billing units are not interchangeable. ## At a glance - models: 1 - modalities: takes text in, gives typed answers out - latest release: Julia 1 (Sep 23, 2026) ## Models ### [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. Its published context window is 8,192 tokens. The advertised input rate is $0.025 per million input tokens. The advertised output rate is $0.00 per million output tokens. - API identifier: `supersoniclabs/julia-1` - Creator: Supersonic Labs; model type: Evaluation. - Context window: 8,192 tokens; tool calling: Not supported. - Inputs: text; outputs: typed answers with probabilities. - Base API pricing (USD): $0.025 per million input tokens; $0.00 per million output tokens. - [Complete model facts, cache rates, context tiers, and FAQs as Markdown]() ## Frequently asked questions ### Which Supersonic Labs models are available through Impossibl? The directory lists 1 model from Supersonic Labs available through the Impossibl API, including Julia 1. Open each model page for its API identifier, capabilities, and current pricing. ### How much do Supersonic Labs models cost? Supersonic Labs model prices vary by model and usage. All rates below are published base API rates in USD. For token-priced models, published input rates start at $0.025 per million input tokens. Published output rates start at $0.00 per million output tokens. Input and output minima may refer to different models. Individual model pages include published cache prices and billing units. Applicable fees and workspace-specific pricing can affect the amount paid. ### Does Impossibl add a markup to Supersonic Labs pricing? No. Usage is charged at the provider's list price with 0% usage markup. Prepaid credit purchases include a 5% platform fee, and there is no subscription. The rates on this page are Supersonic Labs's published base rates, and usage comes off your balance when the request finishes. ### What context windows do Supersonic Labs models support? Among Supersonic Labs models with a published limit on Impossibl, the largest context window is 8,192 tokens, listed for Julia 1. Context limits vary by model and are separate from maximum output limits. ### What inputs and capabilities do Supersonic Labs models support? Available model types include evaluation. Published input support includes text; support varies by model. Tool calling is published as unsupported for 1 model. ### How do I use Supersonic Labs models through an API? Use the exact model identifier from the model page with the Impossibl API. For example, select supersoniclabs/julia-1 with /v1/systemone. Endpoint compatibility depends on the selected model. The API quickstart explains how to create an API key and send a request. ## Sources and related links Prices, capabilities, limits, and availability describe the public Impossibl API offering. An unpublished fact is unknown; a published zero price is zero. Compare matching billing units and check context tiers before estimating costs. - [Public Impossibl model catalog]() - [Full model directory as JSON]() - [Model directory as Markdown]() - [API quickstart]() - [Model documentation]()