Claude Opus 4.5 vs GPT-5.5
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-5.5 by OpenAI wins on 4 of 8 benchmarks against Claude Opus 4.5 by Anthropic, which leads on 2. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
Coding: In coding, GPT-5.5 scores 1272 on Design Arena ELO compared to Claude Opus 4.5's 1242, while GPT-5.5 scores 1269 on Website Arena ELO compared to Claude Opus 4.5's 1259.
Reasoning: In reasoning, GPT-5.5 scores 93.8% on GPQA Diamond compared to Claude Opus 4.5's 86.5%, while Claude Opus 4.5 scores 77.0% on τ²-Bench Airline compared to GPT-5.5's 75.3%.
Context: In context, GPT-5.5 scores 1.1M on Context Length compared to Claude Opus 4.5's 200K.
Pricing Comparison
Claude Opus 4.5 costs $5.0/1M input tokens and $25.0/1M output tokens, while GPT-5.5 costs $5.0/1M input and $30.0/1M output. Both models are priced identically for input tokens.
Verdict
Claude Opus 4.5 and GPT-5.5 are closely matched. The best choice depends on your specific use case and priorities.
View Individual Model Pages
Claude Opus 4.5 vs GPT-5.5 — FAQ
Which is better, Claude Opus 4.5 or GPT-5.5?
GPT-5.5 wins on more benchmarks overall (4 vs 2). However, the best choice depends on your specific needs — each model excels in different areas.
How does Claude Opus 4.5 compare to GPT-5.5 for coding?
SWE-bench Verified data is not available for both models. Check the detailed comparison charts above for other coding-related metrics.
Is Claude Opus 4.5 cheaper than GPT-5.5?
Both models are priced the same at $5.0/1M input tokens. Claude Opus 4.5 output costs $25.0/1M and GPT-5.5 output costs $30.0/1M.
Which is faster, Claude Opus 4.5 or GPT-5.5?
Output speed data is not available for both models. Check the speed section of the comparison above for available performance data.
What benchmarks does the Claude Opus 4.5 vs GPT-5.5 comparison cover?
This comparison covers 8 benchmarks including GPQA Diamond, Input Cost, Output Cost, Context Length, Cached Input Cost, Design Arena ELO, τ²-Bench Airline, Website Arena ELO. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.