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    Model family

    GPT-OSS on FlexAI.Every variant. One key

    GPT-OSS is OpenAI's open model line on FlexAI. 2 variants run serverless on the OpenAI-compatible API, spanning chat. One API key serves every variant.

    Get an API keyAll models

    Variants

    Every served variant in the family, with live serverless pricing.

    Serverless · pay per token

    ModelContextPriceStatus
    GPT-OSS 120B128K$0.035 / $0.09 per M Serving
    GPT-OSS 20B128K$0.027 / $0.117 per M Serving

    Which variant for what

    Pick by the role you're filling. Same key for all of them.

    Flagship

    GPT-OSS 120B

    GPT-OSS 120B is the largest served serverless variant. Reach for it first.

    Fast & economical

    GPT-OSS 20B

    GPT-OSS 20B is the smallest serverless variant. Lowest latency and cost.

    GPT-OSS 20B runs review & fast edits in coding agents · GPT-OSS 20B runs respond in support agents · GPT-OSS 120B runs plan in workflow automation

    Call the flagship

    OpenAI-compatible. Swap the model id for any variant above.

    curl https://tokens.flex.ai/v1/chat/completions \
  -H "Authorization: Bearer $FLEXAI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-oss-120b",
    "messages": [{"role": "user", "content": "Hello from FlexAI"}]
  }'

    Where it runs

    Use cases that put GPT-OSS to work in a pipeline.

    Coding agents

    Agents that generate, review, and repair code across your repo.

    See the pipeline

    Support agents

    Agents that triage, answer, and resolve customer conversations.

    See the pipeline

    Workflow automation

    Agents that chain tools and approvals into reliable multi-step runs.

    See the pipeline

    Run GPT-OSS on one API key

    Every GPT-OSS variant, serverless and dedicated, behind one OpenAI-compatible key.

    Get an API keyTalk to us

    $10/month in free credits for your first 3 months

    See how much you could save