Claude Opus 4.8 vs GPT-5.5 Pro
Side-by-side comparison. Updated 2026-06-04.
Verdict
Claude Opus 4.8 wins on higher overall score (9.7 vs 9.5, +0.2).
- ~50% cheaper input
At a Glance
| Attribute | Claude Opus 4.8 | GPT-5.5 Pro |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Tags | general | Reasoning |
| Context | 1,000,000 tokens | 1,050,000 tokens |
| Input price | $15.00/1M | $30.00/1M |
| Output price | $180.00/1M | $180.00/1M |
| Input modalities | Text | Text |
| Output modalities | Text | Text |
Claude Opus 4.8 Strengths
- 1M token context window — largest in Claude family
- Strongest agentic task performance of any Claude model
- Consistent quality across long-running autonomous work
- Superior end-to-end project orchestration
- Best coding performance in the Opus line