OpenAI

GPT-5.6

Maker
OpenAI
Origin
United States
Released
Jul 9, 2026
Category
Language Models

Strengths & weaknesses

  • Best-in-class agentic reasoning, with search, code execution, and computer use in one API
  • Disciplined, low-hallucination output on long, multi-step tasks
  • Long-context requests above roughly 272K tokens get repriced sharply higher
  • Slower to produce a first answer than most rivals at max reasoning

Evaluation

Awaiting evaluation
  • Reasoningw25—
  • Accuracyw20—
  • Long contextw15—
  • Speedw10—
  • Cost efficiencyw15—
  • Deployabilityw15—

w = weight, each criterion’s share of the overall score. How scoring works

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  • Zero-data-retention eligible, useful for regulated or enterprise deployments
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Anthropic

Claude Sonnet 5

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  • Enabling maximum thinking mode can quietly balloon token spend
  • Trails Opus on the hardest multi-step reasoning problems
Anthropic

Claude Haiku 4.5

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  • Noticeably weaker on hard reasoning than Sonnet or Opus
Google

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