GPT-5.4 nano
United States benchmark
Exact match by programall 18 output groups, best first
Bar length is the unweighted exact-match rate on that program's outputs; the right column is the program's share of the headline weight, which follows household dollars, so the bars do not average to the headline.
- Local income tax100.0%0.3%
- Person-level CHIP eligibility100.0%0.2%
- Reduced-price school meals eligibility100.0%0.1%
- TANF99.0%0.3%
- SSI97.9%2.0%
- Person-level Early Head Start eligibility97.4%3.1%
- Person-level WIC eligibility96.0%0.3%
- Person-level Head Start eligibility94.7%1.2%
- Person-level Medicare eligibility93.0%11%
- Free school meals eligibility92.0%0.7%
- Self-employment tax91.0%2.1%
- SNAP86.0%4.1%
- Federal refundable credits86.0%3.7%
- State refundable credits81.8%0.6%
- Person-level Medicaid eligibility72.3%30%
- State tax before refundable credits55.9%6.0%
- Federal tax before refundable credits51.2%19%
- Payroll tax17.7%16%
Table view (exact, within 1%, outputs), hardest first
| Program | Exact | Within 1% | n |
|---|---|---|---|
| Payroll tax | 17.7% | 22.9% | 96 |
| Federal tax before refundable credits | 51.2% | 52.4% | 84 |
| State tax before refundable credits | 55.9% | 55.9% | 93 |
| Person-level Medicaid eligibility | 72.3% | 72.3% | 173 |
| State refundable credits | 81.8% | 81.8% | 99 |
| Federal refundable credits | 86.0% | 86.0% | 100 |
| SNAP | 86.0% | 86.0% | 93 |
| Self-employment tax | 91.0% | 92.0% | 100 |
| Free school meals eligibility | 92.0% | 92.0% | 100 |
| Person-level Medicare eligibility | 93.0% | 93.0% | 172 |
| Person-level Head Start eligibility | 94.7% | 94.7% | 38 |
| Person-level WIC eligibility | 96.0% | 96.0% | 177 |
| Person-level Early Head Start eligibility | 97.4% | 97.4% | 38 |
| SSI | 97.9% | 97.9% | 97 |
| TANF | 99.0% | 99.0% | 100 |
| Local income tax | 100.0% | 100.0% | 98 |
| Person-level CHIP eligibility | 100.0% | 100.0% | 177 |
| Reduced-price school meals eligibility | 100.0% | 100.0% | 100 |
Hardest casesworst misses on positive references
- Federal tax before refundable credits1260% offReference $500 · predicted $6,794Inspect household #046
- State tax before refundable credits464% offReference $13 · predicted $72Inspect household #023
- Payroll tax198% offReference $4,590 · predicted $13,663Inspect household #009
- State tax before refundable credits134% offReference $2,087 · predicted $4,875Inspect household #026
- Federal tax before refundable credits100% offReference $2,906 · predicted $0Inspect household #000
- Federal tax before refundable credits100% offReference $3,708 · predicted $0Inspect household #007
Scores are from the frozen manuscript snapshot under the AI-alone condition: structured responses over the same household facts (whole-scenario or in output subsets, per the serving-configuration table), no tools, graded against PolicyEngine reference outputs. See the leaderboard and paper for methodology. The frozen US annotations cover 8,765 rows whose legacy threshold score is below 1. That universe contains 8,761 of 8,761 exact-match misses and 4 exact hits. Another 2,329 rows with bounded score below 100 were not selected and have no audit annotation.