Announcement (OpenAI) | April 16, 2026 | named for Rosalind Franklin
OpenAI’s first domain-specific frontier reasoning model, tuned for biology, drug discovery, and translational medicine. Unlike OpenAI’s general models, it was never released to the public. It ships only through a vetted trusted-access program.
What it does
Reasons over molecules, proteins, genes, pathways, and disease-relevant biology. The pitched workflows are the parts of research that used to need years of expert synthesis:
- Synthesize evidence and generate biological hypotheses
- Plan experiments and interpret sequence-to-function relationships
- Literature review, data analysis, and multi-step tool use over scientific databases
The numbers
| Benchmark | GPT-Rosalind | Field |
|---|---|---|
| BixBench (Pass@1) | 0.751 | GPT-5.4 0.732, GPT-5 0.728, Grok 4.2 0.698, Gemini 3.1 Pro 0.550 |
OpenAI also reports a Dyno Therapeutics evaluation placing its best submissions at the 95th percentile on prediction tasks. BixBench is a bioinformatics-and-data-analysis benchmark; per the implicator.ai analysis, a curated-task score does not establish real drug-pipeline impact, which (given 10-15 year timelines and ~1-in-10 candidate survival) could take years to demonstrate.
Access model
Not public. Research preview inside ChatGPT, Codex, and the API for qualified customers only, plus a free Life Sciences plugin for Codex. Launch partners: Amgen, Moderna, the Allen Institute, Thermo Fisher Scientific. A domain-specialized counterpart to general coding agents like Claude Code, reached through the same Codex plugin surface.
Safety and dual use
OpenAI applies hard refusals on known biosecurity red lines plus classifier-based monitoring on user inputs, and cites this dual-use risk as its reason for not releasing the model: one that reasons about pathogen biology and binding-affinity edits cuts both ways. Time frames Rosalind as part of a wider “too dangerous to release” posture across the industry.
Timeline
- Apr 16, 2026 - GPT-Rosalind announced, trusted-access only
- May 29, 2026 - Rosalind Biodefense: free access for government, academic, and nonprofit teams on pandemic preparedness, split into a developer track and a government track
- Jun 2026 - update folds in GPT-5.5’s agentic coding and tool use; completes long-horizon quantitative-biology analyses with 31% fewer tokens, cuts genomics compute, and widens global access