Claude Opus 4 vs GPT-OSS 120B
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Claude Opus 4 by Anthropic and GPT-OSS 120B by OpenAI are evenly matched across 8 benchmarks. 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 scores 1171 on Design Arena ELO compared to GPT-OSS 120B's 974, while Claude Opus 4 scores 1177 on Website Arena ELO compared to GPT-OSS 120B's 980.
Reasoning: In reasoning, Claude Opus 4 scores 79.6% on GPQA Diamond compared to GPT-OSS 120B's 74.9%.
Context: In context, Claude Opus 4 scores 200K on Context Length compared to GPT-OSS 120B's 131K.
Pricing Comparison
Claude Opus 4 costs $15.0/1M input tokens and $75.0/1M output tokens, while GPT-OSS 120B costs $0.04/1M input and $0.17/1M output. GPT-OSS 120B is the more affordable option for API usage.
Speed Comparison
Claude Opus 4 generates output at 50 tok/s compared to GPT-OSS 120B's 339 tok/s, and the time to first token is 550 ms for Claude Opus 4 versus 440 ms for GPT-OSS 120B. GPT-OSS 120B delivers faster throughput.
Verdict
GPT-OSS 120B leads across the board in affordability, speed, making it the stronger overall choice in this comparison.
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Claude Opus 4 vs GPT-OSS 120B — FAQ
Which is better, Claude Opus 4 or GPT-OSS 120B?
Claude Opus 4 and GPT-OSS 120B are evenly matched across benchmarks. The best choice depends on your specific priorities such as coding ability, speed, or pricing.
How does Claude Opus 4 compare to GPT-OSS 120B 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 cheaper than GPT-OSS 120B?
Yes, GPT-OSS 120B is cheaper. Claude Opus 4 costs $15.0/1M input and $75.0/1M output tokens. GPT-OSS 120B costs $0.04/1M input and $0.17/1M output tokens.
Which is faster, Claude Opus 4 or GPT-OSS 120B?
GPT-OSS 120B is faster, generating output at 339 tok/s compared to 50 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Claude Opus 4 vs GPT-OSS 120B comparison cover?
This comparison covers 8 benchmarks including GPQA Diamond, Output Speed, Time to First Token, Input Cost, Output Cost, Context Length, Design Arena ELO, Website Arena ELO. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.