Across the full 0.5–4 bpd K-only sweep, allocator choice mattered little from about 2 bpd upward, while KV-COBRA—especially its KL ordering on LongBench—degraded more gracefully at low rates than the evaluated baselines.

Reported and observed measurements

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Each row is a measurement with its reported value, latest available observation, and cumulative evidence state.
Metric and conditions	Reported	Latest observation	Evidence judgment
bpd: 0.5 · side: K-only · model: LLaMA-3.1-8B · objective: MSE · datasetOrTask: mean(Wikitext-2, PTB, C4)	31.17 perplexity	—	Not assessed
bpd: 0.5 · side: K-only · model: LLaMA-3.1-8B · objective: KL · datasetOrTask: mean(Wikitext-2, PTB, C4)	37.31 perplexity	—	Not assessed
bpd: 0.5 · side: K-only · model: Mistral-7B-v0.3 · objective: MSE · datasetOrTask: mean(Wikitext-2, PTB, C4)	36.5 perplexity	—	Not assessed
bpd: 0.5 · side: K-only · model: Mistral-7B-v0.3 · objective: KL · datasetOrTask: mean(Wikitext-2, PTB, C4)	36.24 perplexity	—	Not assessed
bpd: 0.5 · side: K-only · model: Qwen2.5-7B-Instruct · objective: MSE · datasetOrTask: mean(Wikitext-2, PTB, C4)	16.33 perplexity	—	Not assessed
bpd: 0.5 · side: K-only · model: Qwen2.5-7B-Instruct · objective: KL · datasetOrTask: mean(Wikitext-2, PTB, C4)	17.17 perplexity	—	Not assessed
bpd: 0.5 · side: K-only · model: LLaMA-3.1-8B · objective: MSE · datasetOrTask: mean(five tasks)	48.8%	—	Not assessed
bpd: 0.5 · side: K-only · model: LLaMA-3.1-8B · objective: KL · datasetOrTask: mean(five tasks)	48.5%	—	Not assessed
bpd: 0.5 · side: K-only · model: Mistral-7B-v0.3 · objective: MSE · datasetOrTask: mean(five tasks)	53.4%	—	Not assessed
bpd: 0.5 · side: K-only · model: Mistral-7B-v0.3 · objective: KL · datasetOrTask: mean(five tasks)	52.5%	—	Not assessed
bpd: 0.5 · side: K-only · model: Qwen2.5-7B-Instruct · objective: MSE · datasetOrTask: mean(five tasks)	48.7%	—	Not assessed
bpd: 0.5 · side: K-only · model: Qwen2.5-7B-Instruct · objective: KL · datasetOrTask: mean(five tasks)	48.5%	—	Not assessed

Metric and conditions

Reported

Latest observation

Evidence judgment

bpd: 0.5 · side: K-only · model: LLaMA-3.1-8B · objective: MSE · datasetOrTask: mean(Wikitext-2, PTB, C4)

31.17 perplexity

—

Not assessed

bpd: 0.5 · side: K-only · model: LLaMA-3.1-8B · objective: KL · datasetOrTask: mean(Wikitext-2, PTB, C4)

37.31 perplexity

—

Not assessed

bpd: 0.5 · side: K-only · model: Mistral-7B-v0.3 · objective: MSE · datasetOrTask: mean(Wikitext-2, PTB, C4)

36.5 perplexity

—

Not assessed

bpd: 0.5 · side: K-only · model: Mistral-7B-v0.3 · objective: KL · datasetOrTask: mean(Wikitext-2, PTB, C4)

36.24 perplexity

—

Not assessed

bpd: 0.5 · side: K-only · model: Qwen2.5-7B-Instruct · objective: MSE · datasetOrTask: mean(Wikitext-2, PTB, C4)

16.33 perplexity

—

Not assessed

bpd: 0.5 · side: K-only · model: Qwen2.5-7B-Instruct · objective: KL · datasetOrTask: mean(Wikitext-2, PTB, C4)

17.17 perplexity

—

Not assessed

bpd: 0.5 · side: K-only · model: LLaMA-3.1-8B · objective: MSE · datasetOrTask: mean(five tasks)

48.8%

—

Not assessed

bpd: 0.5 · side: K-only · model: LLaMA-3.1-8B · objective: KL · datasetOrTask: mean(five tasks)

48.5%

—

Not assessed

bpd: 0.5 · side: K-only · model: Mistral-7B-v0.3 · objective: MSE · datasetOrTask: mean(five tasks)

53.4%

—

Not assessed

bpd: 0.5 · side: K-only · model: Mistral-7B-v0.3 · objective: KL · datasetOrTask: mean(five tasks)

52.5%

—

Not assessed

bpd: 0.5 · side: K-only · model: Qwen2.5-7B-Instruct · objective: MSE · datasetOrTask: mean(five tasks)

48.7%

—

Not assessed

bpd: 0.5 · side: K-only · model: Qwen2.5-7B-Instruct · objective: KL · datasetOrTask: mean(five tasks)

48.5%

—

Not assessed

Reported and observed measurements

Assessments (0)

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Measurement results