Claude Opus 4.5 vs Gemini 2.0 Flash
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Claude Opus 4.5 by Anthropic wins on 10 of 15 benchmarks against Gemini 2.0 Flash by Google, which leads on 5. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
General Intelligence: In general intelligence, Claude Opus 4.5 scores 1468 on Chatbot Arena ELO compared to Gemini 2.0 Flash's 1240, while Claude Opus 4.5 scores 89.5% on MMLU-Pro compared to Gemini 2.0 Flash's 66.0%, while Claude Opus 4.5 scores 90.0% on IFEval compared to Gemini 2.0 Flash's 86.6%.
Coding: In coding, Claude Opus 4.5 scores 92.0% on HumanEval+ compared to Gemini 2.0 Flash's 76.0%, while Claude Opus 4.5 scores 80.9% on SWE-bench Verified compared to Gemini 2.0 Flash's 28.0%, while Claude Opus 4.5 scores 70.0% on LiveCodeBench compared to Gemini 2.0 Flash's 32.0%.
Math: In math, Claude Opus 4.5 scores 90.0% on MATH compared to Gemini 2.0 Flash's 68.0%, while Claude Opus 4.5 scores 96.5% on GSM8K compared to Gemini 2.0 Flash's 86.0%.
Reasoning: In reasoning, Claude Opus 4.5 scores 87.0% on GPQA Diamond compared to Gemini 2.0 Flash's 38.0%, while Claude Opus 4.5 scores 57.0% on ARC-AGI compared to Gemini 2.0 Flash's 18.0%.
Context: In context, Gemini 2.0 Flash scores 1.0M 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 Gemini 2.0 Flash costs $0.10/1M input and $0.40/1M output. Gemini 2.0 Flash is the more affordable option for API usage.
Speed Comparison
Claude Opus 4.5 generates output at 50 tok/s compared to Gemini 2.0 Flash's 220 tok/s, and the time to first token is 1700 ms for Claude Opus 4.5 versus 85 ms for Gemini 2.0 Flash. Gemini 2.0 Flash delivers faster throughput.
Verdict
For developers prioritizing coding and general intelligence and math, Claude Opus 4.5 has the edge. For those who value affordability and speed, Gemini 2.0 Flash is the stronger choice.
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Claude Opus 4.5 vs Gemini 2.0 Flash — FAQ
Which is better, Claude Opus 4.5 or Gemini 2.0 Flash?
Claude Opus 4.5 wins on more benchmarks overall (10 vs 5). However, the best choice depends on your specific needs — each model excels in different areas.
How does Claude Opus 4.5 compare to Gemini 2.0 Flash for coding?
Claude Opus 4.5 is better for coding, scoring 80.9% on SWE-bench Verified compared to 28.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Claude Opus 4.5 cheaper than Gemini 2.0 Flash?
Yes, Gemini 2.0 Flash is cheaper. Claude Opus 4.5 costs $5.0/1M input and $25.0/1M output tokens. Gemini 2.0 Flash costs $0.10/1M input and $0.40/1M output tokens.
Which is faster, Claude Opus 4.5 or Gemini 2.0 Flash?
Gemini 2.0 Flash is faster, generating output at 220 tok/s compared to 50 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Claude Opus 4.5 vs Gemini 2.0 Flash comparison cover?
This comparison covers 15 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, IFEval, MATH, GPQA Diamond, SWE-bench Verified, Output Speed, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.