---
id: "prism-ml/ternary-bonsai-2-9b"
also: ["prism-ml/ternary-bonsai-2-9b-20261015", "prism-ml/Ternary-Bonsai-2-9B-gguf"]
cheapest_list_usd_per_m: "0.08 in, 0.13 out, at darkbloom/int4 on openrouter"
cheapest_effective_usd_per_m: "0.0797 in, 0.1278 out, at darkbloom/int4 on openrouter"
context: 262144
max_output: 65536
input: ["text", "image"]
output: ["text"]
released: "2026-10-16"
api: ["/api/v1/chat/completions", "/api/v1/completions", "/api/v1/messages", "/api/v1/responses"]
params: ["frequency_penalty", "include_reasoning", "logprobs", "max_tokens", "presence_penalty", "reasoning", "repetition_penalty", "response_format", "seed", "stop", "structured_outputs", "temperature", "tool_choice", "tools", "top_k", "top_logprobs", "top_p"]
endpoints: 1
gateways: "openrouter (1)"
no_training: 1
trains: 0
retains_prompts: 1
---
# PrismML: Ternary Bonsai 2 9B

Ternary Bonsai 2 9B is PrismML’s compact, open-weight language model for conversational AI, reasoning, and tool use. Built on Qwen3.5, it uses ternary weights packed into 2 bits for efficient...