Price Per TokenPrice Per Token
OpenAI
OpenAI
vs
OpenAI
OpenAI

GPT-OSS-120b vs GPT-OSS-20b

A detailed comparison of pricing, benchmarks, and capabilities

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116 out of our 296 tracked models have had a price change in January.

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Key Takeaways

GPT-OSS-120b wins:

  • Faster response time
  • Higher intelligence benchmark
  • Better at coding
  • Better at math

GPT-OSS-20b wins:

  • Cheaper input tokens
  • Cheaper output tokens
Price Advantage
GPT-OSS-20b
Benchmark Advantage
GPT-OSS-120b
Context Window
GPT-OSS-20b
Speed
GPT-OSS-120b

Pricing Comparison

Price Comparison

MetricGPT-OSS-120bGPT-OSS-20bWinner
Input (per 1M tokens)$0.04$0.02 GPT-OSS-20b
Output (per 1M tokens)$0.19$0.10 GPT-OSS-20b
Using a 3:1 input/output ratio, GPT-OSS-20b is 48% cheaper overall.

GPT-OSS-120b Providers

GMICloud $0.02 (Cheapest)
Chutes $0.04
OpenRouter $0.04
SiliconFlow $0.05
NCompass $0.05

GPT-OSS-20b Providers

GMICloud $0.02 (Cheapest)
DeepInfra $0.03
Parasail $0.04
Phala $0.04
SiliconFlow $0.04

Benchmark Comparison

7
Benchmarks Compared
6
GPT-OSS-120b Wins
0
GPT-OSS-20b Wins

Benchmark Scores

BenchmarkGPT-OSS-120bGPT-OSS-20bWinner
Intelligence Index
Overall intelligence score
32.924.7
Coding Index
Code generation & understanding
27.618.1
Math Index
Mathematical reasoning
93.489.3
MMLU Pro
Academic knowledge
80.874.8
GPQA
Graduate-level science
78.268.8
LiveCodeBench
Competitive programming
87.877.7
Aider
Real-world code editing
41.8--
GPT-OSS-120b significantly outperforms in coding benchmarks.

Cost vs Quality

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GPT-OSS-120b
Other models

Context & Performance

Context Window

GPT-OSS-120b
131,072
tokens
GPT-OSS-20b
131,072
tokens
Max output: 131,072 tokens

Speed Performance

MetricGPT-OSS-120bGPT-OSS-20bWinner
Tokens/second337.9 tok/s309.0 tok/s
Time to First Token0.42s0.51s

Capabilities

Feature Comparison

FeatureGPT-OSS-120bGPT-OSS-20b
Vision (Image Input)
Tool/Function Calls
Reasoning Mode
Audio Input
Audio Output
PDF Input
Prompt Caching
Web Search

License & Release

PropertyGPT-OSS-120bGPT-OSS-20b
LicenseOpen SourceOpen Source
AuthorOpenAIOpenAI
ReleasedAug 2025Aug 2025

GPT-OSS-120b Modalities

Input
text
Output
text

GPT-OSS-20b Modalities

Input
text
Output
text

Related Comparisons

Compare GPT-OSS-120b with:

Compare GPT-OSS-20b with:

Frequently Asked Questions

GPT-OSS-20b has cheaper input pricing at $0.02/M tokens. GPT-OSS-20b has cheaper output pricing at $0.10/M tokens.
GPT-OSS-120b scores higher on coding benchmarks with a score of 27.6, compared to GPT-OSS-20b's score of 18.1.
GPT-OSS-120b has a 131,072 token context window, while GPT-OSS-20b has a 131,072 token context window.
GPT-OSS-120b does not support vision. GPT-OSS-20b does not support vision.