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 — Anthropic
Claude 4.5 Sonnet is Anthropic’s state-of-the-art coding and tool-use model, leading the SWE-bench coding benchmark and powering Claude Code, Claude.ai, and Claude in the Anthropic API.
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 | Claude 4.5 Sonnet | Llama 4 405B |
|---|---|---|
| Released | May 8, 2026 | Apr 5, 2025 |
| Developer | Anthropic | Meta |
| Type | multimodal | multimodal |
| License | proprietary | open-weight |
| Context window | 1,000,000 | 1,000,000 |
| Parameters | — | 405B |
| Input $/M tokens | $3.00 | — |
| Output $/M tokens | $15.00 | — |
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=claude-4-5-sonnet&b=llama-4-405b. CORS is open. Citation guidance: /about/editorial-process.