Models · OpenAI
GPT-5.5
GPT-5.5 is a dedicated reasoning model from OpenAI, excelling at deep analytical tasks that require extended chain-of-thought. It performs exceptionally on math, logic, and scientific problem-solving.
Input $5.00 per 1M tokens
Output $30.00 per 1M tokens
Context 256K tokens · $35.00 combined per 1M
Benchmark performance
Source: Artificial Analysis. Updated 2026-09-20.
Key strengths
- — Deep chain-of-thought reasoning
- — Strong math and logic performance
- — Excellent for structured problem-solving
- — High-quality step-by-step explanations
Best use cases
- Mathematical proofs and derivations
- Scientific research assistance
- Complex logical reasoning tasks
- Code debugging with root cause analysis
Pricing details
| Input (per 1M tokens) | $5.00 |
| Output (per 1M tokens) | $30.00 |
| Context window | 256K tokens |
| Architecture | Reasoning-optimized dense transformer, 256K context, extended chain-of-thought generation |
| Provider | OpenAI |
Reasoning model
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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.