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GPT-5.3 Codex Spark

Tools
openai/gpt-5.3-codex-spark

200K context · Mar 2026 · 1 upstreams

GPT-5.3 Codex Spark is a low-latency, lower-cost variant of GPT-5.3 Codex tuned for fast iterative coding inside the Codex environment, with streaming and function calling. Served through OpenAI's Responses API.

Bring your own keyAnyRouter has no platform route for GPT-5.3 Codex Spark. Requests use your key and bill your provider account. AnyRouter adds no fee.
context
200K
input
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output
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routes
1
speed, 24h
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Details

Owner
OpenAI
Kind
Chat
Released
Mar 2026
Context
200K
Data policy
Provider retention
Endpoint
/api/v1/chat/completions

Quick start

curl https://anyrouter.dev/api/v1/chat/completions \
  -H "Authorization: Bearer $ANYROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "openai/gpt-5.3-codex-spark",
  "messages": [
    {
      "role": "user",
      "content": "Say hi in 3 words."
    }
  ]
}'