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gpt-5-5 is the current flagship of OpenAI’s GPT-5 family. Vision-capable on image input, reasoning depth tunable via reasoning_effort, broad tool / function support, JSON mode and structured outputs. On the gateway, it’s the default landing spot when DOSIA’s text-writing-tools.chat_with is asked to “use a different LLM” — so a user prompt like “have GPT rewrite this paragraph” routes here. Pricing: 5.00/1Minput,5.00 / 1M input, 30.00 / 1M output, $0.50 / 1M cache read — see the rate card. Failures don’t bill.

Protocols

Quickstart

Capabilities

When to use

  • Default GPT-5 family pick — when “use GPT-5” is the brief, this is the alias.
  • DOSIA chat_with — main brain calls this when the user asks for a non-Claude voice (“have GPT rewrite this”).
  • Reasoning-heavy chat — pair with reasoning_effort: "high" for harder analysis.
When not to use:

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