Claude Opus 4.5 vs GLM-5.3-Flash
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GLM-5.3-Flash by Zhipu AI wins on 6 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, GLM-5.3-Flash scores 1310 on Design Arena ELO compared to Claude Opus 4.5's 1242, while GLM-5.3-Flash scores 1286 on Website Arena ELO compared to Claude Opus 4.5's 1259.
Reasoning: In reasoning, Claude Opus 4.5 scores 86.5% on GPQA Diamond compared to GLM-5.3-Flash's 85.8%, while Claude Opus 4.5 scores 77.0% on τ²-Bench Airline compared to GLM-5.3-Flash's 75.3%.
Context: In context, GLM-5.3-Flash scores 1.3M 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 GLM-5.3-Flash costs $0.15/1M input and $0.50/1M output. GLM-5.3-Flash is the more affordable option for API usage.
Verdict
GLM-5.3-Flash leads across the board in affordability, making it the stronger overall choice in this comparison.
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Claude Opus 4.5 vs GLM-5.3-Flash — FAQ
Which is better, Claude Opus 4.5 or GLM-5.3-Flash?
GLM-5.3-Flash wins on more benchmarks overall (6 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 GLM-5.3-Flash 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 GLM-5.3-Flash?
Yes, GLM-5.3-Flash is cheaper. Claude Opus 4.5 costs $5.0/1M input and $25.0/1M output tokens. GLM-5.3-Flash costs $0.15/1M input and $0.50/1M output tokens.
Which is faster, Claude Opus 4.5 or GLM-5.3-Flash?
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 GLM-5.3-Flash 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.