Benchmark Almanac

SciUniverse

Claude Fable 5.1 45.3% leads since Sep 2026 Not in model cards

92 tasks in 17 chemistry, biology and materials families run in C5R's lab or its digital twin. Pass@1 averaged equally across families.

Level 1. 8 families run in the real lab, so results are noisier. Model evaluation by contacting C5R.

Made by C5R Released Sep 2026 Lab and data work Tasks kept private Last model added Sep 2026 Scores refreshed 2 Nov 2026
Level
Expert Specialists with years of training, often over hours of work
Scored
Checked automatically A program checks the result against an answer key, unit tests or the expected final state.
Answers
Agent task Many steps in a terminal, browser, desktop, app, game or robot.
Leaderboard
6
Models scored on its own leaderboard

Claude Fable 5.1 leads with 45.3% among models released by Sep 2026

Best score per model from the benchmark's own leaderboard, read on 2 Nov 2026. Where a model ran with several settings or harnesses, we keep its best.

The newest model with a score here came out in Sep 2026, and nobody has tested a newer one. Among the 20 highest-ranked models on the capability index, these have no score yet:

  1. 45.3 Claude Fable 5.1
  2. 32.5 GPT-6 Astra
  3. 30.5 Claude Opus 5
  4. 26.2 Grok 4.6
  5. 14.6 Gemini 3.8 Flash
  6. 9.40 GPT-5.6 Sol
  1. 1 Claude Fable 5.1 xhigh 45.3%
  2. 2 GPT-6 Astra xhigh 32.5%
  3. 3 Claude Opus 5 xhigh 30.5%
  4. 4 Grok 4.6 xhigh 26.2%
  5. 5 Gemini 3.8 Flash high 14.6%
  6. 6 GPT-5.6 Sol xhigh 9.40%
#ModelScoreSettingDateSource
1 Claude Fable 5.1 45.3% xhigh Sep 2026 Official leaderboard
2 GPT-6 Astra 32.5% xhigh Sep 2026 Official leaderboard
3 Claude Opus 5 30.5% xhigh Jul 2026 Official leaderboard
4 Grok 4.6 26.2% xhigh Aug 2026 Official leaderboard
5 Gemini 3.8 Flash 14.6% high Sep 2026 Official leaderboard
6 GPT-5.6 Sol 9.40% xhigh Jul 2026 Official leaderboard

Number one over time

Lab claims count from the day the card came out, independent runs from the model’s release.

Anthropic
Own leaderboard Not tested since Sep 2026
Claude Fable 5.1 45.3%

Scores over time

All the scores we have, one dot each, so a model tested at several settings appears more than once.

On the benchmark’s own leaderboard Best so far
0% 20% 40% 60% 80% 100% Near the ceiling (85%) Claude Fable 5.1 Claude Opus 5 GPT-5.6 Sol 0% 20% 40% 60% 80% 100% Near the ceiling (85%) Claude Fable 5.1 Claude Opus 5

No lab model card reports it yet

We read the headline results of 479 launch posts from 51 labs, and none of them list this benchmark.

More in Science and reasoning

All 88 in Science and reasoning
  • GPQA Diamond In use 198 graduate-level 'Google-proof' multiple-choice questions in biology, chemistry and physics. Gemini 4 Argon 96.4%
  • Terminal-Bench-Science In use 70 scientific research-workflow tasks across five science areas, run in Harbor containers. Hidden tests give the resolution rate. GPT-6 Astra 68.1%
  • FrontierScience In use Models solve physics, chemistry, and biology problems in an Olympiad track graded by short answer and a Research track graded by 10-point rubrics. Intern-S2-397B 87%
  • BioMysteryBench In use Bioinformatics problems on anonymized real datasets that require real analysis with tools. Rubric-graded, with human-solvable and human-difficult splits. Claude Opus 5 90.1%
  • HiPhO In use Models solve theory problems from 2024 and 2025 physics olympiad exams, some with diagrams. Official marking schemes grade answers and steps, mapped to medal levels. Gemini 3 Pro 78.3%
  • LABBench2 In use 11 biology research sub-tasks (literature, figures, tables, patents, trials and more) with tool access. Macro-averaged accuracy. GPT-5.2 60.9%