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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.

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Protocols

ProtocolPath
OpenAI Chat CompletionsPOST https://llm.bytespike.ai/v1/chat/completions

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Quickstart

curl https://llm.bytespike.ai/v1/chat/completions \
  -H "Authorization: Bearer $BYTESPIKE_API_KEY" \
  -H "content-type: application/json" \
  -d '{
    "model": "gpt-5-5",
    "messages": [
      { "role": "user", "content": "Untangle this contract paragraph." }
    ],
    "reasoning_effort": "medium"
  }'

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Capabilities

CapabilitySupported
Chat Completions✅
Streaming (SSE)✅
Vision (image input)✅
Tools / function calling✅ parallel
JSON mode✅
Structured outputs✅
reasoning_effort low / medium / high✅
Context window128K tokens
Modalitychat + vision
Capability bucketvision + external_chat

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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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