GPT-5.5 Pro vs Claude Sonnet 5
Side-by-side comparison. Updated 2026-07-04.
Summary
Compare GPT-5.5 Pro and Claude Sonnet 5 across pricing, context window, modalities, strengths, weaknesses, and best-fit workloads.
Use the details below to weigh cost, context, modalities, and workload fit.
At a Glance
| Attribute | GPT-5.5 Pro | Claude Sonnet 5 |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Tags | Agentic Coding Intelligent Long Context Reasoning | Intelligent Reasoning Coding Agentic Image Input Long Context |
| Context | 1,050,000 tokens | 1,000,000 tokens |
| Input price | $30.00/1M | $2.00/1M |
| Output price | $180.00/1M | $10.00/1M |
| Input modalities | Image, Text | Text, Image, File |
| Output modalities | Text | Text |
GPT-5.5 Pro Strengths
- Unmatched deep reasoning for complex high-stakes workloads
- 1M+ token context window with image input support
- Excels at long-horizon agents and multi-step coding
- Precise execution across agentic workflows
Claude Sonnet 5 Strengths
- 76.1% on Novel Compiler evaluation (vendor-reported)
- 1,000,000 token (~977K) context window with 128k output
- $2.00/M input tokens — 85% cheaper than GPT-5.5 Pro
- 96.65% harmless response rate on API (vendor-reported)
- Up to 90% cost savings with prompt caching