GPT-5.5 vs Claude Opus 4.8 Fast
Side-by-side comparison. Updated 2026-06-04.
Verdict
GPT-5.5 wins on higher overall score (9.4 vs 9.3, +0.1).
Both models score equally. Pick based on which strengths align with your workload.
At a Glance
| Attribute | GPT-5.5 | Claude Opus 4.8 Fast |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Tags | general | Fast |
| Context | 128,000 tokens | 1,000,000 tokens |
| Input price | $12.50/1M | $10.00/1M |
| Output price | $50.00/1M | $50.00/1M |
| Input modalities | Text | Text |
| Output modalities | Text | Text |
GPT-5.5 Strengths
- Deeper reasoning than GPT-5 on complex professional tasks
- Improved token efficiency on hard problems
- Higher reliability and consistency than GPT-5
- 1M+ token context window via ChatGPT
- Available via API and ChatGPT consumer interface