Claude Opus 5 vs OpenAI: GPT-5.5 Pro
Head-to-head API cost, context, and performance comparison. Synced at 4:58:15 PM.
Executive Summary
When evaluating Claude Opus 5 against OpenAI: GPT-5.5 Pro, the pricing structure is a key differentiator. Claude Opus 5 is approximately 86% more cost-effective per 1 million tokens overall.
However, when looking at raw reasoning capabilities, Claude Opus 5 leads with a statistical ELO score of 1654. For tasks involving complex logic, coding, or instruction-following, developers might prefer Claude Opus 5, provided their budget allows for the API burn rate.
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Raw Technical comparison
Verdict
If you are looking for pure performance and capability, Claude Opus 5 is statistically superior. However, if API burn rate is the primary concern, Claude Opus 5 wins out aggressively in pricing.
People Also Ask
Is Claude Opus 5 cheaper than OpenAI: GPT-5.5 Pro?
Yes. Claude Opus 5 is cheaper for both input and output generation compared to OpenAI: GPT-5.5 Pro. Exploring alternatives often yields cost reductions.
Which model has the larger context window?
The OpenAI: GPT-5.5 Pro model has the advantage in memory, offering a massive 1,050,000 token limit for document ingestion.