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GPT-5.3 Chat OpenAI Deprecated Grok 4.20 Reasoning xAI
Input No data $1.25
Output No data $2.50
Blended No data $1.56
Context window 128k 1M
Max output 16k No data
Vision ✓ ✓
Reasoning ✓ ✓
Tool calling ✓ ✓
Structured output ✓ ✓
Prompt caching − ✓
Batch API ✓ ✓
Licence Proprietary Proprietary
API model id gpt-5.3-chat-latest grok-4.20-0309-reasoning

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  1. GPT-5.3 ChatOpenAI128k
  2. Grok 4.20 ReasoningxAI1M

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