GPT-5.5 Pro vs Claude Opus 4.8 Fast
Side-by-side comparison. Updated 2026-06-04.
Verdict
GPT-5.5 Pro wins on higher overall score (9.5 vs 9.3, +0.2).
Both models score equally. Pick based on which strengths align with your workload.
At a Glance
| Attribute | GPT-5.5 Pro | Claude Opus 4.8 Fast |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Tags | Reasoning | Fast |
| Context | 1,050,000 tokens | 1,000,000 tokens |
| Input price | $30.00/1M | $10.00/1M |
| Output price | $50.00/1M | $50.00/1M |
| Input modalities | Text | Text |
| Output modalities | Text | Text |