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Models

GPT-5.5

gpt-5.5by GPT50% off
CompareOpen in Playground

Context

1.05M

Max output

128K

Pricing

$5/M in$0.50/M cached$30/M out

Waterfall

Supported parameters

primary route

Sampling

Status
NNovita via Experiential Cloudexperiential———1.05M128K$5$30cache$0.50——activeestimated
OpenAI via Experiential Cloudexperiential37.9 tok/s802ms77.9%1.05M128K$5$30cache$0.50——activemeasured
Azure Foundry via Experiential Cloudexperiential——38.5%1.05M128K$5$30cache$0.50——activemeasured

Fastest

37.9 tok/s

Released

Apr 2026

Temperature0–2 · reasoning off onlyTop-p0–1

Tools & structure

ToolsStrict toolsParallel tool callsStructured output

Reasoning

Reasoningnone · low · medium · highDefaultmedium

Streaming

Streaming

Limits

Max output128,000

Shown for the primary route; fallback routes may differ. Sending an unsupported field? See error reference.

OpenAI docs

Quickstart

I want you to route my LLM calls for "gpt-5.5" through the Experiential gateway instead of
calling the provider directly. It speaks the OpenAI Chat Completions API, so this is a base-URL
and key swap. Please:

1. Point the client at https://api.staging.experientiallabs.ai/v1 as the base URL.
2. Authenticate with my Experiential API key from the EXPLABS_API_KEY environment variable. If
   it isn't set, stop and tell me to create one under Settings -> API Keys and export it.
3. Use the model id "gpt-5.5" exactly.
4. Update every place my code builds an LLM client for this model to use that base URL and key,
   leaving streaming and tool-calls as they are.
5. Make one test call and show me the reply plus the token usage, so we confirm it runs on my
   Experiential credits.

Tell me which files you changed.

Set EXPLABS_API_KEY to an organization API key before running your agent.

Benchmarks

Release notes
  • MMLU-Propublic leaderboard · Aug 202688.9%
  • GPQA Diamondvendor reported · Aug 202693.6%
  • SWE-bench Verifiedpublic leaderboard · Aug 202680.6%
  • LiveBenchpublic leaderboard · Aug 202680.2%
  • AIME 2025public leaderboard · Aug 2026100.0%
  • AIME 2026public leaderboard · Aug 2026100.0%
  • Humanity's Last Examvendor reported · Aug 202641.4%
  • LMArena EloLMArena · Aug 20261466
  • Terminal-Benchvendor reported · Aug 202682.7