GPT-5.5 Pro vs GPT-5.1
Side-by-side comparison. Updated 2026-07-01.
Summary
Compare GPT-5.5 Pro and GPT-5.1 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 | GPT-5.1 |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Tags | Agentic Coding Intelligent Long Context Reasoning | Intelligent Reasoning Multimodal |
| Context | 1,050,000 tokens | 128,000 tokens |
| Input price | $30.00/1M | $10.00/1M |
| Output price | $180.00/1M | $40.00/1M |
| Input modalities | Image, Text | Text |
| 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
GPT-5.1 Strengths
- Strong general knowledge
- Reliable structured output
- Broad tool-use capability
- Lower latency than GPT-5