Claude Opus 4.6 vs GPT-OSS 20B
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-OSS 20B by OpenAI wins on 2 of 3 benchmarks against Claude Opus 4.6 by Anthropic, which leads on 1. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from the AI Value Index.
Category-by-Category Breakdown
Context: In context, Claude Opus 4.6 scores 200K on Context Length compared to GPT-OSS 20B's 131K.
Speed Comparison
Claude Opus 4.6 generates output at 68 tok/s compared to GPT-OSS 20B's 312 tok/s, and the time to first token is 1680 ms for Claude Opus 4.6 versus 470 ms for GPT-OSS 20B. GPT-OSS 20B delivers faster throughput.
Verdict
GPT-OSS 20B leads across the board in speed, making it the stronger overall choice in this comparison.
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Claude Opus 4.6 vs GPT-OSS 20B — FAQ
Which is better, Claude Opus 4.6 or GPT-OSS 20B?
GPT-OSS 20B wins on more benchmarks overall (2 vs 1). However, the best choice depends on your specific needs — each model excels in different areas.
How does Claude Opus 4.6 compare to GPT-OSS 20B 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 4.6 cheaper than GPT-OSS 20B?
Complete pricing data is not available for both models. Check the pricing section of the comparison above for available cost information.
Which is faster, Claude Opus 4.6 or GPT-OSS 20B?
GPT-OSS 20B is faster, generating output at 312 tok/s compared to 68 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Claude Opus 4.6 vs GPT-OSS 20B comparison cover?
This comparison covers 3 benchmarks including Output Speed, Time to First Token, Context Length. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.