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OpenAI | OpenAI | Meta | Meta | |
|---|---|---|---|---|
| Vendor | OpenAI | OpenAI | Meta | Meta |
| Family | GPT | GPT | Llama | Llama |
| Release date | 2025-04-14 | 2026-04-23 | 2025-04-05 | 2025-04-05 |
| Context window | 1,000,000 tokens | 400,000 tokens | 10,000,000 tokens | 1,000,000 tokens |
| Parameters | — | — | 109B | 400B |
| Modality | text, vision | text, vision, audio | text, vision | text, vision |
| License | proprietary | proprietary | Llama 4 Community License | Llama 4 Community License |
| Source | proprietary | proprietary | open weights | open weights |
| Description | — | 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. | — | Mixture-of-experts open-weight model from Meta. |
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