C5R CORP.

Synthesize alpha alumina

Physical end-to-end experiments
Task space

Convert gamma-phase alumina powder to alpha-phase alumina and prepare the product for powder X-ray diffraction.

Alpha-phase alumina (corundum) is hard, stable, electrically insulating, and thermally conductive. These properties make it useful for electronic substrates and semiconductor packaging. Controlling crystal structure through heat treatment is an important part of producing materials with the desired properties.

Agents choose heating conditions and execute a process lasting less than 20 hours, aiming to maximize conversion to the alpha phase. They then prepare a sample for X-ray diffraction to measure the resulting phase composition.

Scoring

The returned sample must contain at least 99.06% α-alumina, meeting the human reference's measured purity.

RESULTS

Convert gamma-phase alumina powder to alpha-phase alumina and prepare a sample for powder XRD.
ModelPass@1Cost ($)Model/API inference cost only, averaged per task attempt. Lab and labor costs are not reported. Repeats are averaged using the same task and family weights as scores.
Claude Opus 5xhigh100.0%$102.55
Claude Fable 5.1xhigh100.0%$94.16
GPT–6 Astraxhigh0.0%$216.42
GPT–5.6 Solxhigh0.0%$41.86
Gemini 3.8 Flashhigh0.0%$2.25
Grok 4.6xhigh0.0%$9.34
0%50%100%

Run progress

Elapsed time from task receipt. Milestones use published annotations or the first matching recorded Facility action. A red × marks when a run stopped, at its last reached milestone.

Task receivedProtocol bookedPowder weighedFurnace completedProduct XRDEnd of recorded run06h12h18h24h30.1hElapsed time / hoursClaude Fable 5.1 · Task received: 0m; 1/1 attemptsClaude Fable 5.1 · Protocol booked: 16m; 1/1 attemptsClaude Fable 5.1 · Powder weighed: 32m; 1/1 attemptsClaude Fable 5.1 · Furnace completed: 16h 12m; 1/1 attemptsClaude Fable 5.1 · Product XRD: 16h 36m; 1/1 attemptsClaude Fable 5.1 · End of recorded run: 17h 07m; 1/1 attempts24.5 %GPT–6 Astra · Task received: 0m; 1/1 attemptsGPT–6 Astra · Protocol booked: 6m; 1/1 attemptsGPT–6 Astra · Powder weighed: 9m; 1/1 attemptsGPT–6 Astra · Furnace completed: 18h 38m; 1/1 attemptsGPT–6 Astra · Product XRD: 19h 31m; 1/1 attemptsGPT–6 Astra · End of recorded run: 19h 35m; 1/1 attempts0.0 %Claude Opus 5 · Task received: 0m; 1/1 attemptsClaude Opus 5 · Protocol booked: 15m; 1/1 attemptsClaude Opus 5 · Powder weighed: 20m; 1/1 attemptsClaude Opus 5 · Furnace completed: 13h 12m; 1/1 attemptsClaude Opus 5 · Product XRD: 14h 26m; 1/1 attemptsClaude Opus 5 · End of recorded run: 14h 38m; 1/1 attempts42.6 %GPT–5.6 Sol · Task received: 0m; 1/1 attemptsGPT–5.6 Sol · Protocol booked: 11m; 1/1 attemptsGPT–5.6 Sol · Powder weighed: 1h 08m; 1/1 attemptsGPT–5.6 Sol · Furnace completed: 20h 30m; 1/1 attemptsGPT–5.6 Sol · Product XRD: 30h 03m; 1/1 attemptsGPT–5.6 Sol · End of recorded run: 30h 04m; 1/1 attempts0.0 %Grok 4.6 · Task received: 0m; 1/1 attemptsGrok 4.6 · Protocol booked: 13m; 1/1 attemptsGrok 4.6 · Powder weighed: 17m; 1/1 attemptsGrok 4.6 · Furnace completed: 19h 31m; 1/1 attemptsGrok 4.6 · Product XRD: 21h 14m; 1/1 attemptsGrok 4.6 · End of recorded run: 21h 24m; 1/1 attempts0.0 %Gemini 3.8 Flash · Task received: 0m; 1/1 attemptsGemini 3.8 Flash · Protocol booked: 10m; 1/1 attemptsGemini 3.8 Flash · Powder weighed: 35m; 1/1 attemptsGemini 3.8 Flash · Furnace completed: 20h 33m; 1/1 attemptsGemini 3.8 Flash · Product XRD: 21h 38m; 1/1 attemptsGemini 3.8 Flash · End of recorded run: 21h 39m; 1/1 attempts0.0 %

Model trajectories

Run grading

Pass
MeasurementRecorded resultOutcome
α-Al₂O₃ content99.46 %✓ Pass

Pass condition: The returned sample must contain at least 99.06% α-alumina, meeting the human reference's measured purity.

Synthesize alpha aluminaClaude Opus 5 xhigh
Run gradingPass
00:0000:01

Model activity

Model transcript

Loading transcript…

Appendix

Equipment, labware and reagents available in the Facility task environment. Selections vary across recorded attempts.

Main equipment2 items
Nabertherm

Nabertherm LHT 08/16 High-Temperature Chamber Furnace (1600 °C)

NABERTHERM:LHT-08-16

Heat alumina powder for conversion to the alpha phase.

Rigaku Corporation

Rigaku MiniFlex600-C Benchtop Powder X-ray Diffractometer

RIGAKU:MINIFLEX-600-C

Measure powder diffraction to assess the alumina phase composition.

Supporting equipment2 items
ItemBrandSKURole
Scout SPX123 Portable Precision BalanceOHAUSOHAUS:30253017Weigh starting powders and recovered material.
Nabertherm LT 15/13 Muffle Furnace (1300 °C)NaberthermNABERTHERM:LT-15-13Thermal processing of alumina powder.
Consumables5 items
ItemBrandSKURole
ASC aluminum XRD sample holder, 2 mm depthRigakuRIGAKU:D2T25JHold the final powder for diffraction measurement.
Almath LR42Z round shallow zirconia crucible (12 ml)Almath CruciblesALMATH:LR42ZContain alumina powder during furnace heating and retain the fired product.
Almath BS46Z flat-bottom zirconia boat crucible (5.2 ml)Almath CruciblesALMATH:BS46ZAlternative zirconia boat used for firing and retaining powder samples.
Uline polystyrene weighing dish, 20 mL, antistaticUlineULINE:S-24431Weigh and transfer small powder charges.
Pure Ponta weighing boats, medium, 100 mL, antistatic polystyrenePure PontaGENERIC:PURE-PONTA-WEIGH-BOAT-100MLLarger weighing boats available for powder handling.
Reagents1 item
ItemBrandSKURole
Aluminum oxide, activated, basic, Brockmann ISigma-AldrichSIGMA-ALDRICH:199443Starting alumina powder for conversion to the alpha phase.