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Ternary Bonsai 2 27B

Prism MLOpen weightsReasoningProvisionalReleased Sep 17, 2026Input: text, image
Compare with Claude Opus 4.5Source scores ↗OpenRouter ↗
Overall score
54.0
Rank 79 of 222 · 39.7–68.4
Context window
262K
262,000 tokens
Price per 1M tokens
$0.075 in · $0.50 out
Source: OpenRouter
Blended price
$0.18
3:1 input:output tokens
Output speed
—
Not measured yet

Category scores

Scores per capability area with the model's rank among ranked models in that category.

  1. 1Math86.2
  2. 2Reasoning77.9
  3. 3Knowledge75.4
  4. 4Instruction following#6974.0
  5. 5Coding43.2
Higher is better. #N is the model's rank in that category, where it is eligible to be ranked.

Benchmark results (18)

As reported in system cards, papers and public evaluations. Position compares this model with every other model reporting the same benchmark.

Multimodal

RealWorldQA80.1#12 of 16
OCRBench V256.9#4 of 5
CharXiv (overall)80.0#1 of 1
A-OKVQA86.8#1 of 1
OmniDocBench 1.689.1#1 of 1

Math

AIME 202595.0#7 of 38
AIME2695.8#6 of 29
MATH-50098.8#1 of 20
GSM8K96.7#1 of 6

Coding

SWE-bench Verified60.8#74 of 98
LiveCodeBench v690.1#7 of 46
BigCodeBench58.1#1 of 1

Agentic & tool use

Terminal-Bench 2.152.8#57 of 68
BFCL v374.9#1 of 5

Knowledge

GPQA85.8#46 of 117
MMLU-Redux89.1#10 of 15

Instruction following

IFEval91.3#18 of 53
IFBench74.0#26 of 42

Pricing by source

USD per 1M tokens.

SourceInputOutputCached in
List price (OpenRouter)$0.075$0.50—
OpenRouter prism-ml/ternary-bonsai-2-27b$0.075$0.50$0.037

Prism ML publishes Ternary Bonsai 2 27B under Apache 2.0 for self-hosting and does not publish a first-party hosted token rate for this exact checkpoint. We represent the open-weight row as self-host/free-per-token before infrastructure costs.

Open weights

From the Hugging Face repository.

Parameters
—
Licence
apache-2.0
Downloads (30 days)
3M

Speed

Measured by us through OpenRouter (median of trials).

Not measured yet.

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