GPT-5.5

openai/gpt-5.5-20260423

OpenAI's GPT-5.5, released on 2026-04-23, processes file, image, and text inputs and outputs text. It supports tools and reasoning, has a context length of 1,050,000 tokens, and is not provided with open weights. Pricing is $5 per million input tokens and $30 per million output tokens.

  • tool use
  • structured outputs
  • reasoning

At a glance

provideropenai
releasedApr 23, 2026
context1.1M
input / M$5

Specifications

What the API gives you

Context window
1.1M tokens
Max output
128K tokens
Input price
$5 / 1M tokens
Output price
$30 / 1M tokens
Cache read
$0.50 / 1M tokens
Modalities
file, image, text → text
Knowledge cutoff
Dec 1, 2025
Released
Apr 23, 2026

Recommendation coverage

Where this model appears

  1. #1Best Value LLM
  2. #2Best LLM for JSON & Schema Output
  3. #3Best LLM for Agentic Coding
  4. #4Best LLM for AI Agents
  5. #4Best LLM for Autonomous Agents
  6. #5Best LLM for Computer & Browser Use
  7. #5Best LLM for Chat & Roleplay
  8. #6Best LLM for Document Parsing
  9. #6Best LLM for Vision & Documents
  10. #6Best LLM for Math & Reasoning
  11. #6Best LLM for Logic & Problem Solving
  12. #6Best LLM for Image Understanding
  13. #7Best LLM for Grounded RAG
  14. #7Best LLM for OCR & Documents

Measured evidence

Public benchmark record

LMArena Agent
7.22026-07-13
LMArena Agent
7.72026-07-20
LMArena Text
1470 Elo2026-07-16
LMArena Text
1491 Elo2026-07-20
LMArena Vision
1297 Elo2026-07-12

LMArena data licensed CC-BY-4.0. Aider (Apache-2.0) and SWE-bench (MIT) are open.

Catalog data via OpenRouter and models.dev. Last checked within the past 6 hours.