openai

OpenAI: GPT-5

openai/gpt-5

A fixed GPT-5 endpoint for evaluating text reasoning and tool-oriented applications. A model's family name does not make every upstream API feature available through this gateway.

text

Try in Playground ↗

Input / 1M tokens$1.25

Output / 1M tokens$10

Context window400,000

Maximum output128,000

Provider-supported parameters

These are upstream capabilities. Jevrouter supports the subset described in the API contract; chat input is currently text only.

include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetoolsstreamdeveloper_role

Capabilities are imported from OpenRouter’s catalog. This does not mean every model has been independently tested by Jevrouter.

Catalog updated: 2026-09-22T08:51:50.371Z · Price version: cmubxr2fa07ukjn0zr0y1r4ne:3

Provider pricing fields · USD per indicated unit

{
  "prompt": "0.00000125",
  "completion": "0.00001",
  "web_search": "0.01",
  "input_cache_read": "0.000000125"
}

JEVROUTER INTEGRATION NOTES · REVIEWED 2026-09-22

What to check in your application

Use /chat/completions here; the Responses API is not currently exposed by Jevrouter.
Keep application state and tool execution outside the gateway, and validate structured outputs before acting on them.

Start with the example below, then test representative inputs against your own acceptance criteria.

Make a request

curl --no-buffer https://api.jevrouter.io/v1/chat/completions \
  -H "Authorization: Bearer $JEVROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d @- <<'JSON'
{
  "model": "openai/gpt-5",
  "messages": [
    {
      "role": "user",
      "content": "Design a short checklist to verify that a streamed tool call is complete before an application executes it."
    }
  ],
  "max_tokens": 1024
}
JSON

Plan your integration

Connect with the OpenAI Python SDK →Estimate this model’s cost →Budgets, request status and safe retries →

Related models to evaluate

Use identical inputs and scoring rules. No ranking is implied by this selection.

OpenAI: GPT-5 Mini Anthropic: Claude Sonnet 4

Source: OpenRouter model catalog. Imported descriptions and capabilities are provider declarations, not independent benchmark results. Jevrouter currently uses OpenRouter as its managed upstream.