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GPT-5.5

OpenAI's Flagship Model for Reasoning and Agentic Workflows

GPT-5.5, codenamed "Spud," is OpenAI's flagship large language model designed for complex professional and agentic workflows. It features stronger reasoning, long-horizon planning, advanced tool use, and a massive ~1M-token context window, making it ideal for multi-step autonomous tasks.

Available in three variants — Thinking/Pro (full frontier capability), Pro (peak coding and multi-step performance), and Instant (fast, free-tier default) — GPT-5.5 supports configurable reasoning effort levels and multimodal inputs including text and images.

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Technical data
Model Creator
OpenAI
Tokens
Input Context Window
1,050,000 tokens
Maximum Output Tokens
128,000 tokens
Multimodal Support

Reasoning model

  • Image
  • Text
Dates
Launch: 
April 2026
Knowladge cut-off: 
December 2025
Privacy & Security
Privacy
Terms
Additional info

Use Cases:

  • Complex Coding & Software Engineering: Solves long-standing engineering problems, refactors major tech debt, and handles hardware/software integration that previous models could not.
  • Long-Document Analysis & Research: Processes entire codebases, legal corpora, or large datasets in a single session, enabling cross-referencing, summarization, and extraction at scale.
  • Scientific & Mathematical Reasoning: Delivers strong performance on hard reasoning tasks across scientific, mathematical, and legal domains for research-intensive teams.
  • Multimodal Document Processing: Accepts text and image inputs, enabling workflows that combine visual data interpretation with text-based analysis and reporting.

Pricing:

  • Input: $5.00 / 1M tokens
  • Output: $30.00 / 1M tokens
Promptitude-enabled AI providers:
Promptitude Compatibility
  • Prompts
  • Chat
  • Vision
  • Context

Further Reading

Discover some models related to the same AI connection.

GPT-4 Omni

GPT-4o, a versatile omni-model AI processing text, audio, and images effectively. Enhanced features, linguistic capabilities, and cost efficiency set it apart.

GPT-4o

OpenAI's Omni-Modal Flagship for Real-Time Multimodal Reasoning

GPT-5.4 nano

Ultra-Fast, Cost-Efficient AI for High-Volume Processing

GPT-4

The best model available capable of complex tasks, but slower and only available once you’re off the waitlist [gpt-4]

GPT-5.2

Long‑Context, Agentic Reasoning Model for Science, Code, and Enterprise Workflows

o1-mini

Efficient AI for resource-constrained environments

GPT-5.4

OpenAI's Frontier Model with Native Computer-Use Capabilities

GPT-4 Preview

Enhanced productivity update with bug fixes for multilingual projects.

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