Most biology benchmarks ask narrow, fact-based questions with clean answers. Scientists weigh imperfect evidence and make decisions. OpenAI released LifeSciBench and it targets that gap directly.

Even the strongest model passes roughly one task in three. The benchmark is far from saturated.

What is LifeSciBench

LifeSciBench contains 750 expert-authored tasks. They span seven workflows and seven biological domains. Each task pairs a prompt, supporting artifacts, and a grading rubric.

The seven workflows cover evidence handling and analysis. They also include design and optimization, scientific reasoning, validation and operations, translation, and scientific communication.

The seven domains run from genomics and medicinal chemistry to clinical and translational science.

Tasks are written as a scientist would brief a colleague. They are free-response, not multiple-choice. Around 79% require multiple reasoning or decision-making steps, averaging four steps each.

How the Benchmark was Built

A cohort of 173 expert scientists wrote the tasks. Each held a Ph.D. and had biotechnology or pharmaceutical experience. Accepted tasks averaged six automated review cycles and at least two expert reviews.

Many tasks ship with artifacts. The benchmark includes 1,062 attached artifacts in total. About 53% of tasks require at least one artifact. Types include sequences, figures, tables, PDFs, and chemical structures.

A separate cohort validated quality. There were 453 reviewers, and 97% held doctorates. Overall agreement exceeded 96% on relevance, reasoning, grounding, and usefulness.

The Rubric System

Rubrics are the core mechanic here. They contain 19,020 criteria across the benchmark. That is roughly 25 criteria per task.

Each criterion rewards one concrete property. Examples include a specific fact, a reasoning step, or a numeric answer within tolerance. Grading runs against the rubric, not a single reference string.

Two metrics summarize performance. Normalized rubric score divides awarded points by total points. Task pass rate counts tasks scoring at or above 70%.

This separation matters for interpretation. A response can earn partial credit while still failing the task. The pass threshold is strict by design.

Here is the scoring logic in plain Python:

def grade(rubric, awarded_ids):
    total = sum(c["pts"] for c in rubric)
    earned = sum(c["pts"] for c in rubric if c["id"] in awarded_ids)
    normalized = earned / total          # partial credit
    passed = normalized >= 0.70          # task-level success
    return normalized, passed

How the Models Performed

OpenAI evaluated five models in a single-turn setting. Each model saw the prompt and artifacts once. Unrestricted internet browsing was permitted.

GPT-Rosalind, OpenAI’s domain-specialized model, led overall. It had the highest per-task mean on 386 of 750 tasks. It also lifted the overall pass rate over GPT-5.5, from 25.7% to 36.1%. Pass rates stayed modest across every model.

Rankings are not the whole story. Gemini 3.1 Pro uniquely led on 214 tasks. Aggregate scores can hide task-specific strengths.

Where Models Win, and Where They Fall Short

Models were strongest on structured judgment. GPT-Rosalind reached a 0.712 mean score on Translation. Scientific Communication scored 0.718, but that category is small, so read it cautiously.

Two workflows stayed hard. Design, Optimization, and Prediction was among the toughest, with GPT-Rosalind passing 30.7%. Analysis was close behind at 30.3%.

Artifact use was a clear bottleneck. GPT-Rosalind dropped from 45.1% on text-only tasks to 28.1% on artifact tasks. GPT-5.5 fell the same way, from 29.9% to 21.9%.

Exact outputs were hardest of all. Sequence and structure criterion success ranged from 46.9% to 18.0% across models. GPT-Rosalind’s gain over GPT-5.5 on generate/construct items was just +0.001.

Models also stalled mid-task. For GPT-Rosalind, 109 tasks earned at least 50% rubric credit but still passed below 20%.

Headroom remains large. No model passed 171 tasks (22.8%). And 261 tasks (34.8%) had a best-model pass rate below 20%.

Strengths and Weaknesses

Strengths:

• Broad coverage across seven workflows and seven biological domains
• Expert-authored rubrics with 19,020 atomic, gradeable criteria
• Realistic artifacts: sequences, figures, tables, PDFs, and structures
• Independent validation by 453 expert reviewers, 97% with doctorates

Weaknesses:

• Single-turn only; real research is iterative and multi-turn
• Built by OpenAI, which also supplies most evaluated models
• Public release may be limited by safety and licensing constraints
• 750 tasks cannot cover every scientific specialty

Try It: Interactive Rubric Grader Demo