GPT-5.5 First Test: 18-Question Targeted Evaluation on the YZ Index

GPT-5.5 First Test: 18 Questions Targeted 84.2, Execution 98.3

OpenAI officially released its latest model update recently, focusing on strengthening the ability to build and migrate low-resource programming languages, including COBOL, Fortran, and Visual Basic, which still support core systems in banking, government, and enterprises. The update announcement noted that such progress will directly benefit the maintenance of legacy systems that rely on these languages.

The Winzheng evaluation team completed an 18-question targeted evaluation within hours of the official release. The question volume in this round was twice that of the daily Smoke test, representing a rapid targeted approach rather than the full weekly leaderboard standard. First-test results show GPT-5.5 with an overall score of 84.2, execution of 98.3, solidity of 67, and an integrity rating of pass.

The high execution score of 98.3 directly echoes the officially emphasized low-resource language capabilities, indicating that the model responds quickly and with high accuracy when handling legacy code migration and build tasks. The overall score of 84.2 reflects outstanding overall targeted performance, but the solidity score of 67 suggests there is still room for optimization in some deep consistency scenarios. The integrity rating of pass indicates that the model did not exhibit obvious hallucinations or bias issues.

It should be specially noted that this 18-question rapid targeted evaluation differs from the full weekly review standard of the main leaderboard and cannot be directly mixed for comparison. In the current main leaderboard (the top ten of the most recent full weekly review), gpt-6-sol leads with 80.4, followed by grok-4 at 79.5, claude-opus-4.7 at 79.2, gpt-o3 at 78.4, gpt-6.1-sol at 78.2, claude-sonnet-4.6 at 77.4, gpt-5.5 at 77.2, gpt-6-luna at 77, gpt-6-astra at 76.9, and deepseek-v4-pro at 74.6. The main leaderboard score for gpt-5.5 is 77.2, which is the result under the full standard.

The first-test data is for quick reference only, and the complete baseline is subject to the next weekly Full evaluation. The team will conduct full-scale testing on a weekly cadence, at which time more comprehensive horizontal comparisons and trend analysis will be provided.