Claude Sonnet 4.5 vs o3 Pro: Pricing Comparison
Compare pricing, capabilities, and costs for your LLM workloads.
Anthropic
Claude Sonnet 4.5
Pricing (per 1M tokens)
Input$3.00
Output$15.00
Cached Input$0.3000
Batch Input$1.50
Batch Output$7.50
Context & Output
Context Window200K tokens
Max Output64K tokens
Capabilities
Categorymid
Multimodaltext + image
Fine-tuningNo
StreamingYes
OpenAI
o3 Pro
Pricing (per 1M tokens)
Input$20.00
Output$80.00
Context & Output
Context Window200K tokens
Max Output100K tokens
Capabilities
Categoryflagship
Multimodaltext + image
Fine-tuningNo
StreamingYes
Quick Verdict
Cheaper Input Price
Claude Sonnet 4.5
85.0% cheaper
Cheaper Output Price
Claude Sonnet 4.5
81.3% cheaper
Larger Context Window
o3 Pro
+0 tokens
Cost Comparison
Sample workload: 1,000,000 input tokens + 1,000,000 output tokens
Claude Sonnet 4.5
$18.00
$3.00/1M input + $15.00/1M output
o3 Pro
$100.00
$20.00/1M input + $80.00/1M output
Claude Sonnet 4.5 is 82.0% cheaper for this workload.
Frequently Asked Questions
Which is cheaper, Claude Sonnet 4.5 or o3 Pro?
For input tokens, Claude Sonnet 4.5 is cheaper at $3.00 per 1M tokens. For output tokens, Claude Sonnet 4.5 is cheaper at $15.00 per 1M tokens. The overall cost depends on your workload's input/output ratio.
What is the context window size of Claude Sonnet 4.5 vs o3 Pro?
Claude Sonnet 4.5 has a context window of 200K tokens, while o3 Pro has 200K tokens. Claude Sonnet 4.5 supports a larger context window of 200K tokens, which is beneficial for processing longer documents.
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