Sakana: Sakana Namazu vs Anthropic: Claude Opus 5 (batch)
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-12.
| Sakana: Sakana Namazu | Anthropic: Claude Opus 5 (batch) | |
|---|---|---|
| Vendor | sakana | anthropic |
| Quality Score | 100 | 100 |
| Input Price | $0.95/M | $2.50/M |
| Output Price | $4.00/M | $12.50/M |
| Context Window | 262,144 | 1,000,000 |
| Max Output | 65,536 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Sakana Namazu costs $1.95 and Claude Opus 5 (batch) costs $5.62, so Sakana Namazu is about 2.9 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 393 pages for Sakana Namazu.
Across the 18 tasks where they differ, Sakana Namazu scores higher on 5 (Code Completion, Regex Writing, JSON Extraction and others), Claude Opus 5 (batch) on 13 (SQL Generation, Code Review, Code Refactoring and others).
Sakana Namazu was released in August 2026 and Claude Opus 5 (batch) in July 2026.
Pick Sakana Namazu if you need lower cost; pick Claude Opus 5 (batch) if you need 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 | Sakana: Sakana Namazu | Anthropic: Claude Opus 5 (batch) |
|---|---|---|
| SQL Generation | 130 | 132 |
| Code Review | 126 | 132 |
| Code Completion | 128 | 117 |
| Code Refactoring | 127 | 136 |
| Bug Fixing | 130 | 136 |
| Unit Test Generation | 121 | 124 |
| Code Documentation | 125 | 129 |
| Regex Writing | 119 | 117 |
| CI/CD Pipelines | 117 | 120 |
| CSV / Spreadsheet Cleanup | 128 | 132 |
| ETL Scripting | 122 | 128 |
| JSON Extraction | 131 | 121 |
| Bulk Data Labeling | 128 | 117 |
| OCR / Document Parsing | 128 | 131 |
| Table Extraction from PDFs | 128 | 131 |
| Long-Document Summarization | 129 | 136 |
| Short-Form Summarization | 123 | 113 |
| Blog Post Writing | 118 | 120 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →