GPT-5 vs GPT-5.5
Direct spec comparison of GPT-5 (from OpenAI) and GPT-5.5 (from OpenAI). Want a 3- or 4-way comparison? Open the multi-model tool →
 GPT-5OpenAI | GPT-5.5 OpenAI | |
|---|---|---|
| Vendor | OpenAI | OpenAI |
| Family | GPT | GPT |
| Release date | 2025-08-07 | 2026-04-23 |
| Context window | 400,000 tokens | 400,000 tokens |
| Parameters | — | — |
| Modality | text, vision, audio | text, vision, audio |
| License | proprietary | proprietary |
| Source | proprietary | proprietary |
| Description | OpenAI's flagship general-purpose model. Superseded by GPT-5.5 in April 2026. | OpenAI's smartest and most intuitive model — successor to GPT-5, with major coding, research, and document workflow gains. GPT-5.5 Pro variant also available for heavier reasoning. |
| Links | ||
| Benchmarks | ||
| MMLU-Pro | 85.1% | 87.6% |
| GPQA-D | 87.3% | 89.4% |
| HumanEval | 95.2% | 96.8% |
| Aider | 85.4% | 89.7% |
| AIME-25 | 91.0% | 94.2% |
| LiveCB | 74.5% | 78.9% |
| MMMU | 74.1% | 78.4% |
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