Claude Opus 4.5 vs Claude Opus 4.6
MCP-Atlas Public?
Opus 4.5at high73.4
Opus 4.6at max79
MCP-Atlas · full 1000?
Opus 4.5at high69.8
Opus 4.6at max76.8
EBR Bench?
Opus 4.5—
Opus 4.6at max12.7
| Benchmark | Opus 4.5 | Opus 4.6 |
|---|---|---|
| MCP-Atlas Public | 73.4 · high | 79 · max |
| MCP-Atlas · full 1000 | 69.8 · high | 76.8 · max |
| τ³-bench · banking · 1.0.1 | 24.7 · high | 27.3 · max |
| Terminal-Bench Hard (version unstated) | 40.9 | 48.5 |
| AA-LCR (long context) 1.1 | 70.7 | 67 |
| SWE-bench Pro (private) | 23.4 | 47.1 |
| APEX-Agents | — | 33 · max |
| DeepSWE 1.1 | — | 31.9 · max |
| EBR Bench | — | 12.7 · max |
| Furniture Assembly | — | 28.3 · max |
Specs
| Spec | Opus 4.5 | Opus 4.6 |
|---|---|---|
| Input, per 1M | $5 | $5 |
| Output, per 1M | $25 | $25 |
| Speed, tok/s | 51 | 43 |
| Context | 200K | 1M |
| Weights | Closed | Closed |
| Released | Nov 2025 | Feb 2026 |
| See images | ✓ | ✓ |
| Read PDFs | Partial | Partial |
| Hear audio | — | — |
| Watch video | — | — |
| Call tools | ✓ | ✓ |
| Force a tool call | Partial | Partial |
| Return strict JSON | ✓ | ✓ |
| Search the web | ? | ? |
| Run code | ? | ? |
| Use a computer | ? | ? |
What breaks when you switch
Opus 4.5 → Opus 4.6
Nothing known.
Opus 4.6 → Opus 4.5