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GPT 5.3 Chat Latest

Canonical id: openai/gpt-5.3-chat · Context: 128K tokens

VisionTool callingJSON mode
Route this with model=auto

Price per 1M tokens

Input $1.75/M · Output $14/M

+ LLMRouter platform fee: 1% of provider cost (≈ $0.0175/M in · $0.14/M out) — billed as its own line, never blended into the price above.

Providers

ProviderContextInput $/MOutput $/M
openai (viewing) 128K $1.75/M $14/M

Served through openai's API — 0% additional markup beyond our 1% platform fee.

Capability profile

Reasoning○○○○○0/5
Coding○○○○○0/5
Quality○○○○○0/5

Not yet graded — this model isn't in Artificial Analysis's evaluated catalog, so it carries no capability score and is never chosen by auto-routing (still servable by requesting its exact model name). See the leaderboard for models with real benchmark data.

API

curl https://api.llmrouter.sh/v1/chat/completions \
  -H "Authorization: Bearer llmr_sk_..." \
  -H "Content-Type: application/json" \
  -d '{"model": "gpt-5.3-chat", "messages": [{"role": "user", "content": "Hello!"}]}'