GPT-OSS 20B vs Grok 4
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-OSS 20B by OpenAI and Grok 4 by xAI 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, Grok 4 scores 1073 on Design Arena ELO compared to GPT-OSS 20B's 906, while Grok 4 scores 1056 on Website Arena ELO compared to GPT-OSS 20B's 865.
Reasoning: In reasoning, Grok 4 scores 87.0% on GPQA Diamond compared to GPT-OSS 20B's 66.5%.
Context: In context, Grok 4 scores 256K on Context Length compared to GPT-OSS 20B's 131K.
Pricing Comparison
GPT-OSS 20B costs $0.03/1M input tokens and $0.13/1M output tokens, while Grok 4 costs $3.0/1M input and $15.0/1M output. GPT-OSS 20B is the more affordable option for API usage.
Speed Comparison
GPT-OSS 20B generates output at 312 tok/s compared to Grok 4's 55 tok/s, and the time to first token is 470 ms for GPT-OSS 20B versus 500 ms for Grok 4. GPT-OSS 20B delivers faster throughput.
Verdict
GPT-OSS 20B leads across the board in affordability, speed, making it the stronger overall choice in this comparison.
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GPT-OSS 20B vs Grok 4 — FAQ
Which is better, GPT-OSS 20B or Grok 4?
GPT-OSS 20B and Grok 4 are evenly matched across benchmarks. The best choice depends on your specific priorities such as coding ability, speed, or pricing.
How does GPT-OSS 20B compare to Grok 4 for coding?
SWE-bench Verified data is not available for both models. Check the detailed comparison charts above for other coding-related metrics.
Is GPT-OSS 20B cheaper than Grok 4?
Yes, GPT-OSS 20B is cheaper. GPT-OSS 20B costs $0.03/1M input and $0.13/1M output tokens. Grok 4 costs $3.0/1M input and $15.0/1M output tokens.
Which is faster, GPT-OSS 20B or Grok 4?
GPT-OSS 20B is faster, generating output at 312 tok/s compared to 55 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the GPT-OSS 20B vs Grok 4 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.