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OpenAI

GPT-5.5

mainstreamClosed

GPT-5.5 is OpenAI's frontier model built for complex professional workloads, succeeding GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It offers a 1.1M token context window and is priced at 5.0 USD per million input tokens and 30.0 USD per million output tokens, positioning it as a premium-tier option for demanding, long-context work.

API Pricing

Input

$5

Output

$30

Cached input

—

Peak hours

—

USD / 1M tokens

※ Verified via OpenRouter live pricing (2026-11-02): $5.0 input / $30.0 output per million tokens.

Specifications

Context window
1.1M Tokens
Max output
—
Input modalities
Text
License
Closed

Capabilities & use cases

Key capabilities

  • Frontier model from OpenAI
  • 1.1M token context window
  • Stronger reasoning than GPT-5.4
  • Improved token efficiency on hard tasks
  • Higher reliability for professional workloads
  • Premium pricing tier

Best for

  • Complex professional workloads
  • Long-context document processing
  • Hard reasoning tasks
  • High-reliability enterprise applications

Official links

Website ↗API platform ↗Pricing page ↗Open in comparator ↗

Same vendor

GPT-6.1 SolGPT-6 AstraGPT-5.6 LunaGPT-5.6 SolGPT-6 LunaGPT-5.6 Terra

Similar price

Claude Opus 4.8 $25Claude Opus 5.5 $20Kimi K3 $15Gemini 3.0 Pro $12Gemini 3.1 Pro $12Claude Sonnet 5.5 $10

FAQ

What does GPT-5.5 cost?
GPT-5.5 is priced at $30 output and $5 input (USD per 1M tokens)
How large is the context window of GPT-5.5?
GPT-5.5 has a 1.1M Tokens context window with up to — output.
Where can I access GPT-5.5?
Official channels: Website and API platform.

Data is refreshed daily and cross-checked against two independent sources; please confirm pricing and specs on the vendor page.