Claude Opus 5 vs GPT-5.6 Sol
| Benchmark | Opus 5 | GPT-5.6 Sol |
|---|---|---|
| Arena Text · creative writing | 1,471 · max | 1,469 · xhigh |
| EQ-Bench Longform Creative Writing 1.11 | 86.3 | 81.7 |
| EQ-Bench Creative Writing v3 | 2,132.6 | 1,971.6 |
| Lech Mazur Short-Story | 3.7 · xhigh | 2.5 · xhigh |
| IFBench (instructions) | — | 69.6 |
Specs
| Spec | Opus 5 | GPT-5.6 Sol |
|---|---|---|
| Input, per 1M | $5 | $4 |
| Output, per 1M | $25 | $20 |
| Cost per task? | $2.19 | $0.50 |
| Speed, tok/s | 55 | 85 |
| Context | 1M | 1.05M |
| Weights | Closed | Closed |
| Released | Jul 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 5 → GPT-5.6 Sol
Nothing known.
GPT-5.6 Sol → Opus 5