Claude Opus 4.8 vs Grok 4.3
Two premium models, same 1M context — but Grok 4.3 is 86% cheaper. Anthropic's flagship vs xAI's cost-efficient powerhouse.
Pricing data verified: Jun 8, 2026
| Specification | Grok 4.3 | Claude Opus 4.8 |
|---|---|---|
| Input Price (per 1M tokens) | $1.25 | $5.00 |
| Output Price (per 1M tokens) | $2.50 | $25.00 |
| Context Window | 1M tokens | 1M tokens |
| Tier | Premium | Premium |
| Provider | xAI | Anthropic |
| Real-time Data | Yes (X integration) | No |
| Cost at 1M input + 500K output | $2.50 | $17.50 |
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Which Model for Which Use Case?
Cost Optimization
Grok 4.3 delivers 86% cost savings with competitive quality. For most production workloads, the quality difference doesn't justify the 7x price premium of Claude Opus 4.8.
Real-time Data & Analysis
Grok 4.3 integrates with X (Twitter) for real-time data access. Claude Opus 4.8 does not have real-time data capabilities — it relies on its training data cutoff.
Complex Reasoning & Creative Writing
Claude Opus 4.8 excels at nuanced, multi-step reasoning and creative writing. It's widely considered the best model for complex analytical tasks and nuanced content generation.
Enterprise & API Ecosystem
Anthropic offers enterprise SLAs, compliance certifications, and a mature API ecosystem. xAI's API is newer but growing rapidly with competitive documentation.
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Frequently Asked Questions
Is Grok 4.3 cheaper than Claude Opus 4.8?
Yes, significantly. Grok 4.3 costs $1.25/M input and $2.50/M output. Claude Opus 4.8 costs $5/M input and $25/M output. Grok 4.3 is 75% cheaper on input and 90% cheaper on output. For a typical workload of 1M input + 500K output tokens/month, Grok 4.3 costs $2.50 vs Claude Opus 4.8's $17.50 — saving you $15/month (86%).
How does Grok 4.3 quality compare to Claude Opus 4.8?
Both are top-tier models with 1M token context windows. Claude Opus 4.8 is generally considered stronger at nuanced reasoning, creative writing, and complex analysis. Grok 4.3 excels at real-time data access (via X/Twitter integration), coding tasks, and maintains competitive benchmark scores. For most production use cases, Grok 4.3 offers exceptional value at 86% lower cost.
When should I choose Claude Opus 4.8 over Grok 4.3?
Choose Claude Opus 4.8 when you need: (1) top-tier nuanced reasoning and analysis, (2) enterprise support and SLAs from Anthropic, (3) complex multi-step reasoning tasks. Choose Grok 4.3 when cost efficiency matters most, you want real-time data access via X integration, or your use case is coding/data analysis where Grok's quality is competitive.
Do both models support the same context window?
Yes. Both Claude Opus 4.8 and Grok 4.3 offer 1M token context windows, making them suitable for long-document processing, large codebases, and complex multi-turn conversations. This is rare at this quality tier and makes both excellent choices for context-heavy applications.