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GPT-5.5 Pro

OpenAI's maximum-compute tier for research-grade answers.

GPT-5.5 Pro spends far more compute per answer than GPT-5.5 — built for research-grade analysis, hardest proofs and one-shot correctness where a wrong answer costs more than the tokens. Vendor list is $30/$180 per 1M.

Best for

Hardest problemsResearch & analysisHigh-stakes output

Strengths

  • ▸Maximum accuracy
  • ▸Research-grade output
  • ▸Deep reasoning

Use GPT-5.5 Pro via AnyModel

One OpenAI-compatible endpoint — just set the model id:

curl https://anymodel.org/v1/chat/completions \
  -H "Authorization: Bearer $ANYMODEL_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.5-pro",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'
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