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 — xAI
Grok 4 is xAI’s flagship model, trained on the Colossus supercomputer cluster. Distinguished by real-time access to X (Twitter) data for current-events reasoning.
| Property | Claude 4.5 Sonnet | Grok 4 |
|---|---|---|
| Released | May 8, 2026 | Apr 10, 2026 |
| Developer | Anthropic | xAI |
| Type | multimodal | multimodal |
| License | proprietary | proprietary |
| Context window | 1,000,000 | 1,000,000 |
| Parameters | — | — |
| Input $/M tokens | $3.00 | $3.00 |
| Output $/M tokens | $15.00 | $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=grok-4. CORS is open. Citation guidance: /about/editorial-process.