SpaceXAI: Grok 4.5 vs Anthropic: Claude Sonnet 5 (batch)
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| SpaceXAI: Grok 4.5 | Anthropic: Claude Sonnet 5 (batch) | |
|---|---|---|
| Vendor | x-ai | anthropic |
| Quality Score | 100 | 100 |
| Benchmark Score | 91.2 | 91.4 |
| Input Price | $2.00/M | $1.00/M |
| Output Price | $6.00/M | $5.00/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 | 88.8 | 88.0 |
| ai_index_agentic | 75.4 | 77.0 |
| ai_index_coding | 100.0 | 100.0 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Claude Sonnet 5 (batch) costs $2.25 and Grok 4.5 costs $3.50, so Claude Sonnet 5 (batch) is about 1.6 times cheaper for the same work.
Claude Sonnet 5 (batch) reads up to 1,000,000 tokens at once, roughly 1,500 pages of text, against about 750 pages for Grok 4.5.
Across the 12 tasks where they differ, Claude Sonnet 5 (batch) on 12 (SQL Generation, Code Completion, Bug Fixing and others).
Grok 4.5 was released in July 2026 and Claude Sonnet 5 (batch) in June 2026.
Pick Claude Sonnet 5 (batch) if you need lower cost, long documents or the stronger all-round task scores.
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 4.5 | Anthropic: Claude Sonnet 5 (batch) |
|---|---|---|
| SQL Generation | 171 | 171 |
| Code Completion | 120 | 120 |
| Bug Fixing | 180 | 180 |
| Code Documentation | 142 | 143 |
| Regex Writing | 135 | 136 |
| Data Analysis | 170 | 171 |
| CSV / Spreadsheet Cleanup | 154 | 154 |
| JSON Extraction | 139 | 140 |
| Bulk Data Labeling | 125 | 126 |
| Long-Document Summarization | 159 | 160 |
| Short-Form Summarization | 123 | 123 |
| Blog Post Writing | 140 | 140 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →