Compare, 2 models
Side by side.
Claude Opus 5 and GPT-5.5 on every board at least two of them share. Blue marks the best in each row.
Specs
List prices, context and published output speed. Blue marks the best in each row.
| Spec | Claude Opus 5Anthropic | GPT-5.5OpenAI |
|---|---|---|
| Lab | Anthropic | OpenAI |
| Type | Language | Language |
| Released | Jul 24, 2026 | Apr 23, 2026 |
| Input price$ per 1M tokens | $5.00 | $5.00 |
| Output price$ per 1M tokens | $25.00 | $30.00 |
| Blended price3 input tokens per output | $10.00 | $11.25 |
| Contexttokens | 1M | 1.05M |
| Open weights | No | No |
Benchmarks
Every board where at least two of these models have a published score. Each score links to its source.
| Board | Claude Opus 5Anthropic | GPT-5.5OpenAI |
|---|---|---|
| Epoch Capabilities IndexOverall, higher is better | 164 | 160 |
| LMArena textOverall, higher is better | 1491Max, style control | 1482High, style control |
| ARC-AGI-2Reasoning and knowledge, higher is better | 90.4%max setting | 85.0%xhigh setting |
| FrontierMath Tiers 1-3Reasoning and knowledge, higher is better | 85.6%max setting | 85.3%xhigh setting |
| GPQA DiamondReasoning and knowledge, higher is better | 93.9%max setting | 94.0%xhigh setting |
n/a means the board has not published a score for that model.