Claude Opus 4.8 vs Grok 4.3
How Claude Opus 4.8 (Anthropic) and Grok 4.3 (xAI) compare on price, context window and best-fit use case.
In short: Claude Opus 4.8 is best for complex coding agents, long-horizon tasks, and workloads needing top reliability and reasoning, while Grok 4.3 suits reasoning and agentic tasks needing current/real-time info and low output costs. On price it's $5.00 vs $1.25 ($0.20 cached) per 1M input tokens; on context, 1M tokens vs 1M tokens.
Verdict
Claude Opus 4.8 is the more capable pick (Bq score 93 vs 88). Choose Grok 4.3 if budget leads: its input price is $1.25 ($0.20 cached) per 1M vs $5.00.
| Spec | Claude Opus 4.8 | Grok 4.3 |
|---|---|---|
| Developer | Anthropic | xAI |
| Context window | 1M tokens | 1M tokens |
| Input price /1M | $5.00 | $1.25 ($0.20 cached) |
| Output price /1M | $25.00 | $2.50 |
| Modalities | text, image | text, image |
| Best for | Complex coding agents, long-horizon tasks, and workloads needing top reliability and reasoning. | Reasoning and agentic tasks needing current/real-time info and low output costs. |
Claude Opus 4.8
- Best-in-class coding and agentic tasks
- Adaptive reasoning with effort controls
- 1M context at flat rate
- Strong instruction following and safety
Grok 4.3
- Very competitive output pricing
- Configurable reasoning effort
- Real-time X and web search integration
- 1M context