Model API comparison
Claude Opus 5
vs Grok 4.5
Free tokens through Tap. No credit card. Not generally available.
At a glance
| Specification | Claude Opus 5 | Grok 4.5 |
|---|---|---|
| Context window | 1M tokens | 500K tokens |
| Maximum output | 128K tokens | 500K tokens |
| Input modalities | text, image, pdf | text, image |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Last updated | 2026-07-24 | 2026-07-08 |
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Model facts sourced from models.dev. Last synced 2026-08-11. Tap availability may differ from upstream model availability.