Meta's May 26th, 2026 Muse Spark report lists Gemini 3.1 Pro at 59.2% in one table and 61.5% in another on SecureBio BioTIER v1 refusals.
By [RuntimeWire Staff](https://runtimewire.com/author/runtimewire-staff)
· Published
Primary source: [Meta Muse Spark Safety & Preparedness Report](https://ai.meta.com/static-resource/muse-spark-safety-and-preparedness-report/)
Why it matters #
BioTIER refusal rates show how often a tested system declines prompts that biosafety experts say should be refused. Meta's six-model table gives operators and policymakers a rare side-by-side view, while its dual Gemini and GPT figures and unclear competitor configurations limit how far the ranking can be generalized.
Meta's own safety paperwork contains the sharpest cross-lab comparison in the file. In the Muse Spark Safety & Preparedness Report, dated May 26th, 2026, Meta put Muse Spark at a 98.0% refusal rate on SecureBio's BioTIER benchmark, Claude Opus 4.6 at 95.4%, GPT-5.4 at 75.4%, and Gemini 3.1 Pro at 59.2% in its summary scorecard.…
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