Models/openai/GPT-5.3 Chat

GPT-5.3 Chat

OpenRouter·openai
gpt-5.3-chatText·—

OpenAI GPT-5.3 chat variant, general dialogue and text generation

Usage← Models
OverviewProvidersPricingUsageRelated Models
Context Window
1.1M
Input Price /M in
Free/M in
Output Price /M out
Free/M out
Cached Input Price /M
Free/M
Max Completion
128K
Input Modalities
text, image
Output Modalities
text
reasoningFunction callingChatVisionJSONStreamingFree

Description

OpenAI GPT-5.3 chat variant, general dialogue and text generation

Available Providers

AllToken can route requests to the providers below based on route priority and policy.

ProviderContextInputOutputCached / MLatencyThroughput

Best For

OpenAI GPT-5.3 chat variant, general dialogue and text generation

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-chat",
    "messages": [
      {"role": "user", "content": "Hello!"}
    ]
  }'
Supported Parameters
temperaturetop_pmax_tokenstoolsresponse_formatreasoning_effortweb_search
API 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-chat.

Forced Model

Always override incoming requests and lock the key to gpt-5.3-chat.

Usage