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GPT-5.5 Pro — and what?

Pricing per million tokens, context window, capabilities — pulled from each provider's public docs. All 1 are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.

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GPT-5.5 Pro
openai/gpt-5.5-pro
Provider
OpenAI
Family
GPT-5
Modality
text
Context window
1,000,000 tok
Max output
16,384 tok
Released
2026-05-22
License
Proprietary
Input price
$30.00 /1M
Output price
$180.00 /1M
Tools
yes
Streaming
yes
Vision
yes
JSON mode
yes
Reasoning
yes
Prompt caching
Batch API
Try it
Open in playground →
GPT-5.5 Pro
openai/gpt-5.5-pro
Full spec →

GPT-5.5 pro uses OpenAI's Responses API with built-in tools, improved reasoning, and stateful context management.

Strengths
  • General-purpose chat
  • Long context
  • Tool use
Use cases
ChatbotsContent generationAgentic workflows

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