GPT-5.5 Pro
OpenAI
GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for...
What is GPT-5.5 Pro?
GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for...
Specifications
- Developer: OpenAI
- Context window: 1.1M tokens
- Max output: 128K tokens
- Input modalities: file, image, text
- Output modalities: text
- Input price: $30.00 per 1M tokens
- Output price: $180.00 per 1M tokens
- Knowledge cutoff: 2025-12-01
- Supported parameters: include_reasoning, max_tokens, reasoning, response_format, seed, structured_outputs, tool_choice, tools
Use GPT-5.5 Pro with PromptLayer
PromptLayer lets teams manage, evaluate, and observe prompts that run on GPT-5.5 Pro alongside every other model in their stack. Version prompts, run evals across models, and ship safe rollouts from the same dashboard.
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