AI Model Profile · OpenAI
GPT-4o (Mar 2025)
GPT-4o (Mar 2025) is an AI model developed by OpenAI (United States), released March 27, 2025. It is a closed model available via API.
Frontier model · API access · Epoch confidence: Speculative · Source: Epoch AI · Updated 2026-08-17
Specifications
| Developer | OpenAI |
| Country | United States |
| Released | March 27, 2025 |
| Domain | Multimodal,Language,Audio,Speech,Vision |
| Weights | Closed / API |
| Access | API access |
| Base model | GPT-4o (Jan 2025) |
| Frontier model | Yes |
All figures from Epoch AI's Notable AI Models database (CC BY 4.0). Blank fields are undisclosed by the developer — never estimated by Affärslivet.
Frequently asked
- Who developed GPT-4o (Mar 2025)?
- GPT-4o (Mar 2025) was developed by OpenAI (United States) and released on March 27, 2025.
- Is GPT-4o (Mar 2025) open source?
- GPT-4o (Mar 2025) is a closed model — its weights are not publicly released; it is available via API access.
Sources
Cite this model profile
Free to cite, quote and reference under CC BY 4.0 — with attribution to Affärslivet. Writing an article or answer? Reference this model profile as:
APA
Affärslivet Research. (2026). GPT-4o (Mar 2025) — specifications & benchmarks. Affärslivet. https://xn--affrslivet-s5a.com/en/ai/models/gpt-4o-mar-2025
MLA
"GPT-4o (Mar 2025) — specifications & benchmarks." Affärslivet, 2026-08-17, xn--affrslivet-s5a.com/en/ai/models/gpt-4o-mar-2025.
Source: Affärslivet — xn--affrslivet-s5a.com/en/ai/models/gpt-4o-mar-2025. Attribute to Affärslivet when citing or linking.