SpaceXAI: Grok 4.6 vs Anthropic: Claude Opus 5 (batch)
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-27.
| SpaceXAI: Grok 4.6 | Anthropic: Claude Opus 5 (batch) | |
|---|---|---|
| Vendor | x-ai | anthropic |
| Quality Score | 100 | 100 |
| Benchmark Score | 75.3 | 87.3 |
| Input Price | $2.00/M | $2.50/M |
| Output Price | $6.00/M | $12.50/M |
| Context Window | 500,000 | 1,000,000 |
| Max Output | 450,000 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 73.1 | 83.8 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Grok 4.6 costs $3.50 and Claude Opus 5 (batch) costs $5.62, so Grok 4.6 is about 1.6 times cheaper for the same work.
Claude Opus 5 (batch) reads up to 1,000,000 tokens at once, roughly 1,500 pages of text, against about 750 pages for Grok 4.6.
On our blended benchmark score Claude Opus 5 (batch) leads 87.3 to 75.3.
Across the 20 tasks where they differ, Grok 4.6 scores higher on 7 (Code Completion, Code Documentation, Regex Writing and others), Claude Opus 5 (batch) on 13 (SQL Generation, Code Review, Code Refactoring and others).
Grok 4.6 was released in August 2026 and Claude Opus 5 (batch) in July 2026.
Pick Grok 4.6 if you need lower cost; pick Claude Opus 5 (batch) if you need long documents or benchmark performance.
Costs use current list prices per million tokens; page counts assume about 0.75 words per token and 500 words per page.
Who wins by task?
| Task | SpaceXAI: Grok 4.6 | Anthropic: Claude Opus 5 (batch) |
|---|---|---|
| SQL Generation | 142 | 142 |
| Code Review | 145 | 147 |
| Code Completion | 119 | 118 |
| Code Refactoring | 147 | 149 |
| Bug Fixing | 149 | 151 |
| Unit Test Generation | 132 | 134 |
| Code Documentation | 137 | 136 |
| Regex Writing | 125 | 125 |
| CI/CD Pipelines | 128 | 130 |
| Frontend Component Design | 130 | 132 |
| Data Analysis | 135 | 136 |
| CSV / Spreadsheet Cleanup | 136 | 135 |
| ETL Scripting | 138 | 139 |
| JSON Extraction | 122 | 121 |
| Bulk Data Labeling | 119 | 117 |
| OCR / Document Parsing | 134 | 135 |
| Table Extraction from PDFs | 134 | 135 |
| Long-Document Summarization | 148 | 149 |
| Short-Form Summarization | 118 | 117 |
| Blog Post Writing | 130 | 130 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →