GPT-5.5 Pro
FeaturedBy OpenAI · Visit provider →
GPT-5.5 Pro is OpenAI's most powerful reasoning model, designed for the hardest problems in science, mathematics, and engineering. It uses extensive test-time compute to solve problems that stump other models.
Key Strengths
- World-class mathematical reasoning
- Solves PhD-level science problems
- Extensive chain-of-thought depth
- Top performance on reasoning benchmarks
Best Use Cases
Pricing Details
| Metric | Value |
|---|---|
| Input (per 1M tokens) | $30.00 |
| Output (per 1M tokens) | $180.00 |
| Context window | 256K tokens |
| Provider | OpenAI |
| Architecture | Maximum-scale reasoning transformer, 256K context, extensive test-time compute allocation |
Heavy reasoning
Benchmark Performance
No independent benchmark data available for GPT-5.5 Pro yet. Check back as we track it from Artificial Analysis.
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Pricing data is sourced from official API documentation and updated weekly. Actual costs may vary based on prompt caching, batch processing, service tiers, and regional pricing. Inblix is not affiliated with OpenAI.