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Claude Mythos 5.1 Anthropic GPT-5.5 Pro OpenAI Legacy
Input $10.00 $30.00
Output $50.00 $180.00
Blended $20.00 $67.50
Context window 1M 1.05M
Max output 128k 128k
Vision ✓ ✓
Reasoning ✓ ✓
Tool calling ✓ ✓
Structured output ✓ ✓
Prompt caching ✓ −
Batch API ✓ ✓
Licence Proprietary Proprietary
API model id claude-mythos-5-1 gpt-5.5-pro

At a glance

Input price, per million tokens
  1. Claude Mythos 5.1Anthropic$10.00
  2. GPT-5.5 ProOpenAI$30.00
Output price, per million tokens
  1. Claude Mythos 5.1Anthropic$50.00
  2. GPT-5.5 ProOpenAI$180
Context window
  1. Claude Mythos 5.1Anthropic1M
  2. GPT-5.5 ProOpenAI1.05M

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