Cygnet (blockbrain, frozen Gemma-4-12B-it)

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blockbrain/cygnet

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Cygnet is a typed decision model based on the frozen Gemma-4-12B-it architecture. It processes text inputs and returns calibrated probabilities for yes/no, multiple-choice, or score questions. The model's weights are open.

  • decision model
  • open-weight

At a glance

providerblockbrain
released—
context—
input / M—

Specifications

What the API gives you

Context window
— tokens
Max output
—
Input price
— / 1M tokens
Output price
— / 1M tokens
Cache read
—
Modalities
text → decision
Knowledge cutoff
—
Released
—

Measured evidence

Public benchmark record

JevBench
68.6 ± 1.42026-10-16

LMArena data licensed CC-BY-4.0. Aider (Apache-2.0) and SWE-bench (MIT) are open. Design Arena uses blind human preference.

Task evidence

How broad is the support?

Each status is exact to this model version and the selected task. Official release claims remain provisional.

  • Best Open-Weight Decision Model for Self-HostingProvisional evidence

    100% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing. 1 of 1 configured evaluation feeds currently have results.

  • Best Decision Model for Agent Routing and ScoringProvisional evidence

    100% of intended weighted task evidence across 1 independent source; broader independent confirmation is still missing. 1 of 1 configured evaluation feeds currently have results.

Recommendation coverage

Where this model appears

  1. #2Best Open-Weight Decision Model for Self-Hosting

Catalog data via OpenRouter and models.dev. Last checked within the past 6 hours.