Cost of thinking tokens

import anthropic

client = anthropic.Anthropic()

response = client.messages.create(
    model="claude-opus-4-6",
    max_tokens=8000,
    thinking={
        "type": "enabled",
        "budget_tokens": 5000
    },
    messages=[
        {
            "role": "user",
            "content": "I have 5 red balls, 3 blue balls, and 2 green balls in a bag. If I draw without replacement, what's the probability of drawing 2 red balls in a row?"
        }
    ]
)

print(f"Stop reason: {response.stop_reason}")
print(f"\nThinking tokens used: {response.usage.cache_creation_input_tokens}")
print(f"Input tokens: {response.usage.input_tokens}")
print(f"Output tokens: {response.usage.output_tokens}")

for block in response.content:
    if block.type == "thinking":
        print(f"\n[Internal reasoning - {len(block.thinking)} chars]")
    elif block.type == "text":
        print(f"\nResponse:\n{block.text}")