Claude Opus 4.5 vs Step 3.7 Flash
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Step 3.7 Flash by StepFun wins on 5 of 8 benchmarks against Claude Opus 4.5 by Anthropic, which leads on 3. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
Coding: In coding, Claude Opus 4.5 scores 1242 on Design Arena ELO compared to Step 3.7 Flash's 1172, while Claude Opus 4.5 scores 1259 on Website Arena ELO compared to Step 3.7 Flash's 1206.
Reasoning: In reasoning, Claude Opus 4.5 scores 86.5% on GPQA Diamond compared to Step 3.7 Flash's 76.6%, while Step 3.7 Flash scores 77.3% on τ²-Bench Airline compared to Claude Opus 4.5's 77.0%.
Context: In context, Step 3.7 Flash scores 262K 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 Step 3.7 Flash costs $0.20/1M input and $1.1/1M output. Step 3.7 Flash is the more affordable option for API usage.
Verdict
Step 3.7 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 Step 3.7 Flash — FAQ
Which is better, Claude Opus 4.5 or Step 3.7 Flash?
Step 3.7 Flash wins on more benchmarks overall (5 vs 3). However, the best choice depends on your specific needs — each model excels in different areas.
How does Claude Opus 4.5 compare to Step 3.7 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 Step 3.7 Flash?
Yes, Step 3.7 Flash is cheaper. Claude Opus 4.5 costs $5.0/1M input and $25.0/1M output tokens. Step 3.7 Flash costs $0.20/1M input and $1.1/1M output tokens.
Which is faster, Claude Opus 4.5 or Step 3.7 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 Step 3.7 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.