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GPT-5.5 Pro

GPT-5.5 Pro is a verified current AI model with official specs, pricing or access details, capabilities, best use cases and key limitations.

Reasoning Language ModelTextImage Paid
In plain English

What is this model and why does it matter?

GPT-5.5 Pro is the higher-compute GPT-5.5 tier for difficult reasoning and precision-sensitive professional tasks.

Hard reasoningScientific analysisComplex professional workPrecision-sensitive tasksLong-form problem solving
Model overview

GPT-5.5 Pro: features, use cases and important details

GPT-5.5 Pro is a current AI model verified from first-party OpenAI sources.

GPT-5.5 Pro verified specifications

GPT-5.5 Pro is the higher-compute GPT-5.5 tier for difficult reasoning and precision-sensitive professional tasks. Its verified context or usage limit is 1050000 tokens, with 128000 tokens maximum output.

GPT-5.5 Pro pricing and access

GPT-5.5 Pro costs $30 per 1M input tokens and $180 per 1M output tokens and uses more compute for harder problems.

GPT-5.5 Pro best uses

Hard reasoning, Scientific analysis, Complex professional work, Precision-sensitive tasks, Long-form problem solving.

GPT-5.5 Pro limitations

Responses-focused workflow, No fine-tuning, Premium pricing makes it unsuitable for high-volume simple tasks.

Get started

How to use this model

  1. Create an OpenAI API key.
  2. Call gpt-5.5-pro through Responses.
  3. Use medium, high or xhigh reasoning.
  4. Use background mode for long jobs.
  5. Validate consequential outputs.
Copy and try

Example prompts

  • Solve this complex technical problem with rigorous reasoning.
  • Review this research plan and identify hidden flaws.
  • Produce a high-confidence decision analysis.
Capabilities

What it can do

  • 1.05M context
  • 128K output
  • High-compute reasoning
  • Image input
  • Function calling
  • Structured outputs
  • Web search
  • File search
Best for

Practical use cases

  • Research
  • Advanced analysis
  • Complex coding review
  • Decision support
  • Professional reasoning
Pricing

What does it cost?

GPT-5.5 Pro costs $30 per 1M input tokens and $180 per 1M output tokens and uses more compute for harder problems.

Input$30 / 1M tokens
Output$180 / 1M tokens
Simple summaryThis is a premium reasoning tier at $30/M input and $180/M output.

What stands out

  • Higher precision than standard GPT-5.5
  • Very large context
  • Strong tool support

Things to consider

  • Very expensive
  • Can take longer to respond
  • No streaming
Limitations

Important restrictions and trade-offs

  • Responses-focused workflow
  • No fine-tuning
  • Premium pricing makes it unsuitable for high-volume simple tasks
SimplifyAITools verdict

Our editorial take

A high-intent premium model page for users comparing OpenAI’s strongest GPT-5.5 reasoning tier with cheaper alternatives.

References

Primary sources

  1. Open source 1 ↗
  2. Open source 2 ↗
  3. Open source 3 ↗
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