Claude Opus 4.5 vs Grok 4
Compare Anthropic and xAI AI models
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
Claude Opus 4.5
Grok 4
Cost Differences
Grok 4 costs less than Claude Opus 4.5
Feature Comparison
| Feature | Claude Opus 4.5 | Grok 4 |
|---|---|---|
| Provider | Anthropic | xAI |
| Input Price | $5.00/1M tokens | $3.00/1M tokens |
| Output Price | $25.00/1M tokens | $15.00/1M tokens |
| Context Window | 200,000 tokens | 256,000 tokens |
| Max Output | 64,000 tokens | 131,072 tokens |
| Category | flagship | reasoning |
| Capabilities | textvisioncodereasoning | textvisionreasoningcode |
| Release Date | 11/1/2025 | 7/9/2025 |
Claude Opus 4.5 vs Grok 4: Which Should You Choose?
Choosing between Claude Opus 4.5 and Grok 4 depends on your priorities: cost efficiency, context length, or raw capability. Grok 4 is the more affordable option at $3.00/1M input tokens — 40% cheaper than Claude Opus 4.5. Meanwhile, Grok 4 offers a significantly larger context window at 256,000 tokens vs 200,000 for Claude Opus 4.5.
These models come from different providers — Anthropic and xAI — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with Anthropic, switching to xAIinvolves migration effort beyond just pricing. Factor in your existing infrastructure when deciding.
These models target different tiers: Claude Opus 4.5 is a flagship model while Grok 4 is reasoning. This means they're optimized for different workloads. Claude Opus 4.5 is built for complex tasks that require deeper reasoning, while Grok 4 offers better value for routine operations.
Output costs matter too. Claude Opus 4.5 charges $25.00/1M output tokens vs $15.00 for Grok 4. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Grok 4 has the edge here at $15.00/1M output tokens.
Multimodal capabilities: Both models support vision (image understanding), so you can send images alongside text prompts with either option.
Best Use Cases
Choose Claude Opus 4.5 when:
- • You're already using Anthropic's API ecosystem
Choose Grok 4 when:
- • Budget is a primary concern
- • You need a larger context window (256,000 tokens)
- • You need longer outputs (up to 131,072 tokens)
- • You're already using xAI's API ecosystem
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
Claude Opus 4.5 (Anthropic)
Grok 4 (xAI)
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