Context Window
1.1M
Input price / 1M tokens
$1.751M tokens
Output price / 1M tokens
$14.001M tokens
Cached input / 1M tokens
$0.171M tokens
Max Completion
128K
Input Modalities
text
Output Modalities
text
reasoningFunction callingChatJSONStreaming
Description
OpenAI GPT-5.3 Codex coding agent, agentic coding and code understanding
Available Providers
AllToken can route requests to the providers below based on route priority and policy.
ProviderContext LengthInput PriceOutput PriceCached / MLatency p50Throughput
Best For
OpenAI GPT-5.3 Codex coding agent, agentic coding and code understanding
How To Use This Model
Use the exact model ID shown below. This is the safest way to avoid call failures, variant mismatches, or incorrect route assumptions.
curl https://api.alltoken.ai/v1/chat/completions \
-H "Authorization: Bearer sk-your-key" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-5.3-codex",
"messages": [
{"role": "user", "content": "Hello!"}
]
}'Supported Parameters
temperaturetop_pmax_tokenstoolsresponse_formatreasoning_effortAPI Key Setup
Smart Routing
Let the platform choose the best provider path automatically.
Default Model
If a request does not specify a model, default the key to gpt-5.3-codex.
Forced Model
Always override incoming requests and lock the key to gpt-5.3-codex.