PrismML: Ternary Bonsai 2 27B

Text input Image input Text output
Author's Description

Bonsai 2 27B is a 27B-parameter reasoning model from PrismML derived from Qwen3.8-27B. It supports coding, mathematics, tool calling, and image understanding with a 262K-token context window. Ternary compression shrinks...

Key Specifications
Cost
$$$$
Context
262K
Parameters
27B
Released
Sep 18, 2026
Speed
★
Ability
★★
Reliability
★★
Supported Parameters

This model supports the following parameters:

Top P Seed Structured Outputs Response Format Logprobs Frequency Penalty Stop Tools Temperature Tool Choice Reasoning Include Reasoning Presence Penalty Top Logprobs Max Tokens
Features

This model supports the following features:

Tools Structured Outputs Response Format Reasoning
Performance Summary

PrismML's Ternary Bonsai 2 27B, a 27B-parameter reasoning model derived from Qwen3.8-27B, demonstrates exceptional speed and competitive pricing. It consistently ranks among the fastest models and offers highly competitive pricing across all benchmarks. The model also exhibits strong reliability, achieving a 94% success rate, indicating consistent delivery of usable responses. In terms of performance across categories, Bonsai 2 27B shows significant strengths in several areas. It achieves high accuracy in Email Classification (99.0%, 87th percentile), Reasoning (96.0%, 78th percentile), and Ethics (99.0%, 53rd percentile), making it well-suited for tasks requiring logical deduction, ethical judgment, and categorization. Its General Knowledge is also robust at 98.5% accuracy (51st percentile). However, a notable weakness is its performance in Hallucinations, with only 54.0% accuracy (9th percentile), suggesting it frequently fails to acknowledge uncertainty when presented with fictional information. Furthermore, its Instruction Following capability is currently at 0.0% accuracy, indicating a significant area for improvement. Despite these limitations, its overall speed and cost-effectiveness, combined with strong performance in core reasoning and classification tasks, position it as a compelling option for specific applications.

Model Pricing

Current Pricing

Feature Price (per 1M tokens)
Prompt $0.075
Completion $0.5
Input Cache Read $0.0375

Price History

Available Endpoints
Provider Endpoint Name Context Length Pricing (Input) Pricing (Output)
Darkbloom
Darkbloom | prism-ml/ternary-bonsai-2-27b-20260918 262K $0.075 / 1M tokens $0.5 / 1M tokens
Benchmark Results
Benchmark Category Reasoning Strategy Free Executions Accuracy Cost Duration