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OpenAIProprietary

GPT-5.5

GPT-5.5 is a flagship reasoning model developed by OpenAI. It specializes in agent programming, computer operation, and knowledge work, and supports a vast context window of 1 million tokens.

Parameters

Undisclosed

Context Window

License

Proprietary

Release Date

2026-04-23

API Pricing

Input Price (per 1M tokens)

$5

Output Price (per 1M tokens)

$30

Billing Mode: standard

Strengths

  • ・Advanced agentic programming capabilities
  • ・Excellent computer operation functions
  • ・Vast one-million-token context

Weaknesses

  • ・Lack of transparency from closed-source
  • ・API costs tied to usage
  • ・Limited public licensing model

Use Cases

  • ・Developing autonomous AI agents
  • ・Automating PC operation workflows
  • ・Knowledge work on large documents

Deep Analysis

Terminal-Bench 2.0

82.7%

SOTA, up from 75.1% (GPT-5.4)

Expert-SWE

73.1%

internal frontier eval

SWE-Bench Pro

58.6%

vs GPT-5.4: 57.7%

Input Price

$5/1M

2x GPT-5.4

Output Price

$30/1M

2x GPT-5.4

Context Window

1M tokens

same as GPT-5.4

Strengths

  • ・State-of-the-art agentic coding (Terminal-Bench 82.7%)
  • ・More token-efficient than GPT-5.4 — fewer tokens for same tasks
  • ・Matches GPT-5.4 latency despite higher intelligence
  • ・Strong computer use and knowledge work capabilities

Weaknesses

  • ・2x price of GPT-5.4 ($5/$30 vs $2.50/$15)
  • ・Trails Claude Opus 4.7 on SWE-bench Pro (58.6% vs 64.3%)
  • ・API availability limited — rolling out gradually

Competitor Comparison

ModelArenaSWEGPQAPrice
Claude Opus 4.7~150087.6%94.2%$5/$25
GPT-5.5N/AN/AN/A$5/$30
GPT-5.4146780.8%94.4%$2.50/$15

Sources

Analysis generated: 2026-05-24