Model comparison
Grok 3 vs Claude Opus 4.8
xAI
Grok 3
xAI's third-generation model - superseded by Grok 4.
Anthropic
Claude Opus 4.8
Anthropic's heavyweight for hard reasoning and agentic work.
Specs
| Metric | Grok 3 | Claude Opus 4.8 |
|---|---|---|
| Context window | 131K tokens | 1M tokens↑ |
| Input $/1M tokens | $3.00↑ | $5.00 |
| Output $/1M tokens | $15.00↑ | $25.00 |
| Modalities | Text | Text · Image |
| Open weights | No | No |
| Released | - | May 2026 |
Capability differences
| Capability | Grok 3 | Claude Opus 4.8 |
|---|---|---|
| Prompt caching | No | Yes |
Key differences
- -Grok 3 offers 131K context; Claude Opus 4.8 offers 1M.
- -Input pricing: Grok 3 at $3.00/1M vs Claude Opus 4.8 at $5.00/1M.