League fixture
Claude Opus 5.5 vs GPT-6.1 Sol.
Form clash — 3rd vs 4th — decided by the data: category winners, tale of the tape and head-to-head benchmarks.
League fixture: Form clash — 3rd vs 4th. In Season Zero, fixture results are decided by the data — the category winners above. When voted fixtures launch, results blend 60% benchmark / 40% crowd per the published rulebook.
Verdict by category
| Category | Claude Opus 5.5 | GPT-6.1 Sol | Winner |
|---|---|---|---|
| League Score | 96.4 | 93.8 | Claude Opus 5.5 |
| Coding (SWE-bench %) | — | — | — |
| Reasoning (GPQA %) | — | — | — |
| Context (tokens) | 1000000 | 1050000 | GPT-6.1 Sol |
| Speed (tok/s) | 75.6 | — | — |
| Price (blended $/1M) | $8.00 | $4.00 | GPT-6.1 Sol (cheaper) |
Tale of the tape
| Spec | Claude Opus 5.5 | GPT-6.1 Sol |
|---|---|---|
| Maker | Anthropic | OpenAI |
| Released | Sep 22, 2026 | Sep 29, 2026 |
| League Score | 96 | 94 |
| Context | 1,000,000 tokens | 1,050,000 tokens |
| Max output | 128,000 | 128,000 |
| $/1M input | $4.00 | $2.00 |
| $/1M output | $20.00 | $10.00 |
| Weights | Closed | Closed |
| Speed | 75.6 t/s | — |
Head-to-head benchmarks (shared only)
| Benchmark | Claude Opus 5.5 | GPT-6.1 Sol |
|---|---|---|
| LiveBench overall | 86.5 | 85.4 |
Cost at three workloads
| Workload | Claude Opus 5.5 | GPT-6.1 Sol |
|---|---|---|
| Light — 1M in / 250K out | $9.00 | $4.50 |
| Standard — 10M in / 2.5M out | $90.00 | $45.00 |
| Long-context — 50M in / 5M out | $300.00 | $150.00 |
The pick
Pick Claude Opus 5.5 if you want the higher overall League Score.
Pick GPT-6.1 Sol if you need the bigger context window; you want the lower running cost.
All figures from the model database — sources and dates on each model page. Cost your own workload or compare a different pair.