Side-by-side comparison of pricing, context window, benchmarks, capabilities, and license. Data sourced from the Interestana AI Index, kept current as developers update their models.
Model A — OpenAI
GPT-4o (“omni”) is OpenAI’s end-to-end multimodal model that processes text, image, and audio in a single neural network and responds in real time.
Model B — Meta
Llama 4 405B is Meta’s frontier-class open-weight model, distributed under the Llama Community License. Strong on multilingual tasks and competitive with proprietary models on reasoning benchmarks.
| Property | GPT-4o | Llama 4 405B |
|---|---|---|
| Released | May 13, 2024 | Apr 5, 2025 |
| Developer | OpenAI | Meta |
| Type | multimodal | multimodal |
| License | proprietary | open-weight |
| Context window | 128,000 | 1,000,000 |
| Parameters | — | 405B |
| Input $/M tokens | $2.50 | — |
| Output $/M tokens | $10.00 | — |
Bold green values indicate the winner on that dimension where comparison is meaningful (lower price wins; bigger context wins; more open license wins; newer date wins).
Programmatic access available at /api/ai/compare?a=gpt-4o&b=llama-4-405b. CORS is open. Citation guidance: /about/editorial-process.