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OpenAI · Language model

GPT Chat Latest

openai/gpt-chat-latest
  • Language
Released May 5, 2026

GPT Chat Latest points to OpenAI's stable API alias `chat-latest` that always resolves to the latest Instant chat model used in ChatGPT. As OpenAI rolls out new Instant model updates...

Specifications

Context window
400,000 tokens
Max output
128,000 tokens
Input
text, image, file
Output
text
Tokenizer
GPT
Moderation
provider-moderated

Supported parameters

Accepted by the model and forwarded as-is by the gateway.

  • max_tokens
  • response_format
  • seed
  • structured_outputs
  • tool_choice
  • tools

Use it

POST /api/v1/chat/completions · MCP chat · full reference

curl https://omnirail.org/api/v1/chat/completions \
  -H "Authorization: Bearer $OMNIRAIL_KEY" -H "Content-Type: application/json" \
  -d '{"model":"openai/gpt-chat-latest","messages":[{"role":"user","content":"Hello"}],"max_tokens":300}'