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Ternary Bonsai 2 27B

PrismML · Multimodal · Released Sep 2026

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A 27B-parameter model from PrismML based on Qwen, compressed with ternary quantization to reduce size while maintaining reasoning capability across coding, mathematics, and tool use.

Strengths
Delivers reasoning performance for code and math tasks in a compact 27B footprint, supported by a 262K-token context window for handling longer problems and multi-step reasoning.
Best for
Projects where a mid-size model with strong reasoning, coding, and math abilities fits your inference and memory constraints, particularly those requiring extended context.
Limitations
Ternary compression introduces quantization trade-offs that may reduce fidelity on complex tasks compared to full-precision alternatives, and at 27B it sits between smaller and larger reasoning models.

Input / 1M

$0.075

Output / 1M

$0.5

Cached input / 1M

$0.0375

Context window

262K

Price history

Input (solid)Output (dashed)
Price per 1M tokens over timeOutput went from $0.5 to $0.5; Input went from $0.075 to $0.075 between Sep 2026 and Sep 2026.$0$0.1$0.2$0.3$0.4$0.5Output on 19 Sep 2026: $0.5Output on 29 Sep 2026: $0.5Out $0.5Input on 19 Sep 2026: $0.075Input on 29 Sep 2026: $0.075In $0.075Sep 2026Sep 2026

Price change

30d
in — out —
90d
in decreased 0.0% out decreased 0.0%
1y
in decreased 0.0% out decreased 0.0%
Since launch
in decreased 0.0% out decreased 0.0%

Snapshots

Effective Input Output Cached in Note Source
29 Sep 2026 $0.075 $0.5 $0.0375 Imported from OpenRouter openrouter.ai
19 Sep 2026 $0.075 $0.5 — Imported from OpenRouter openrouter.ai

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