Models · OpenAI
GPT-5.5 Pro
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.
Input $30.00 per 1M tokens
Output $180.00 per 1M tokens
Context 256K tokens · $210.00 combined per 1M
Key strengths
- — World-class mathematical reasoning
- — Solves PhD-level science problems
- — Extensive chain-of-thought depth
- — Top performance on reasoning benchmarks
Best use cases
- Cutting-edge scientific research
- Advanced mathematical theorem proving
- Complex engineering simulations
- Drug discovery and molecular modeling
Pricing details
| Input (per 1M tokens) | $30.00 |
| Output (per 1M tokens) | $180.00 |
| Context window | 256K tokens |
| Architecture | Maximum-scale reasoning transformer, 256K context, extensive test-time compute allocation |
| Provider | OpenAI |
Heavy reasoning
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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.