Claude Opus 4.8 vs Claude Opus 5
| Benchmark | Opus 4.8 | Opus 5 |
|---|---|---|
| Arena Text · creative writing | 1,469 · high | 1,471 · max |
| EQ-Bench Longform Creative Writing 1.11 | 80.8 | 86.3 |
| EQ-Bench Creative Writing v3 | 1,840.2 | 2,133.5 |
| Lech Mazur Short-Story | 0.7 · xhigh | 3.7 · xhigh |
| IFBench (instructions) | 62.2 | — |
Specs
| Spec | Opus 4.8 | Opus 5 |
|---|---|---|
| Input, per 1M | $5 | $5 |
| Output, per 1M | $25 | $25 |
| Cost per task? | $4.08 | $2.19 |
| Speed, tok/s | 60 | 51 |
| Context | 1M | 1M |
| Weights | Closed | Closed |
| Released | May 2026 | Jul 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 4.8 → Opus 5
Nothing known.
Opus 5 → Opus 4.8
Nothing known.