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-5 is OpenAI’s next-generation multimodal model, extending native video understanding, audio synthesis, and unified reasoning across modalities in a single forward pass.
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-5 | Llama 4 405B |
|---|---|---|
| Released | Mar 18, 2026 | Apr 5, 2025 |
| Developer | OpenAI | Meta |
| Type | multimodal | multimodal |
| License | proprietary | open-weight |
| Context window | 1,000,000 | 1,000,000 |
| Parameters | undisclosed | 405B |
| Input $/M tokens | $5.00 | — |
| Output $/M tokens | $20.00 | — |
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-5&b=llama-4-405b. CORS is open. Citation guidance: /about/editorial-process.