Ternary Bonsai 2 27B
Summary
Ternary Bonsai 2 27B is an open-weight language model from Prism ML, released on 18 Sept 2026. It accepts text and images and generates text, with a 262K-token context window and up to 33K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $0.07 per million input tokens and $0.50 per million output tokens (OpenRouter), across 1 provider we track.
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...
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | Prism ML |
|---|---|
| Release date | 18 Sept 2026 [OpenRouter] |
| Status | Generally available |
| Weights | Open weights [Hugging Face] |
| License | apache-2.0 [Hugging Face] |
| Context window | 262K (262,144 tokens) [OpenRouter] |
| Max output | 33K tokens [OpenRouter] |
| Input | Text and images [OpenRouter] |
| Output | Text [OpenRouter] |
| Reasoning mode | Yes [OpenRouter] |
| Tool calling | Yes [OpenRouter] |
| Structured output | Yes [OpenRouter] |
| Hugging Face | prism-ml/Ternary-Bonsai-2-27B-gguf [Hugging Face] |
Ternary Bonsai 2 27B API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenRouter prism-ml/ternary-bonsai-2-27b | $0.07 | $0.50 | $0.04 | 262K | OpenRouter, 4 Oct 2026 |
Frequently asked questions
What is the context window of Ternary Bonsai 2 27B?
Ternary Bonsai 2 27B has a context window of 262,144 tokens (262K) and can generate up to 32,768 tokens in a single response, according to OpenRouter.
How much does the Ternary Bonsai 2 27B API cost?
Ternary Bonsai 2 27B is listed from $0.07 per million input tokens and $0.50 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.
Is Ternary Bonsai 2 27B open source?
Ternary Bonsai 2 27B is an open-weight model: its weights are published on Hugging Face as prism-ml/Ternary-Bonsai-2-27B-gguf under the apache-2.0 license. Check the license terms before commercial use.
When was Ternary Bonsai 2 27B released?
Prism ML released Ternary Bonsai 2 27B on 18 Sept 2026, according to OpenRouter.
Change history
No changes detected since we started tracking this model. We re-check every source daily.