Model comparison
Grok 4.20 vs Claude Opus 4.8
xAI
Grok 4.20
xAI's fourth-generation model with a 2M-token context window.
Anthropic
Claude Opus 4.8
Anthropic's heavyweight for hard reasoning and agentic work.
Specs
| Metric | Grok 4.20 | Claude Opus 4.8 |
|---|---|---|
| Context window | 2M tokens↑ | 1M tokens |
| Input $/1M tokens | $1.25↑ | $5.00 |
| Output $/1M tokens | $2.50↑ | $25.00 |
| Modalities | Text · Image · File | Text · Image |
| Open weights | No | No |
| Released | Mar 2026 | May 2026 |
Capability differences
| Capability | Grok 4.20 | Claude Opus 4.8 |
|---|---|---|
| Prompt caching | No | Yes |
Key differences
- -Grok 4.20 offers 2M context; Claude Opus 4.8 offers 1M.
- -Input pricing: Grok 4.20 at $1.25/1M vs Claude Opus 4.8 at $5.00/1M.