Key Takeaways
GPT-OSS-120b wins:
- Higher intelligence benchmark
- Better at coding
- Better at math
GPT-OSS-20b wins:
- Cheaper input tokens
- Cheaper output tokens
- Faster response time
Price Advantage
GPT-OSS-20b
Benchmark Advantage
GPT-OSS-120b
Context Window
GPT-OSS-20b
Speed
GPT-OSS-20b
Pricing Comparison
Price Comparison
| Metric | GPT-OSS-120b | GPT-OSS-20b | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $0.04 | $0.03 | GPT-OSS-20b |
| Output (per 1M tokens) | $0.19 | $0.14 | GPT-OSS-20b |
Using a 3:1 input/output ratio, GPT-OSS-20b is 25% cheaper overall.
GPT-OSS-120b Providers
DeepInfra $0.04 (Cheapest)
SiliconFlow $0.05
Chutes $0.05
Novita $0.05
NCompass $0.05
GPT-OSS-20b Providers
DeepInfra $0.03 (Cheapest)
Parasail $0.04
Novita $0.04
NCompass $0.04
Clarifai $0.04
Benchmark Comparison
7
Benchmarks Compared
6
GPT-OSS-120b Wins
0
GPT-OSS-20b Wins
Benchmark Scores
| Benchmark | GPT-OSS-120b | GPT-OSS-20b | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 33.3 | 24.5 | |
Coding Index Code generation & understanding | 28.6 | 18.5 | |
Math Index Mathematical reasoning | 93.4 | 89.3 | |
MMLU Pro Academic knowledge | 80.8 | 74.8 | |
GPQA Graduate-level science | 78.2 | 68.8 | |
LiveCodeBench Competitive programming | 87.8 | 77.7 | |
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
Speed Performance
| Metric | GPT-OSS-120b | GPT-OSS-20b | Winner |
|---|---|---|---|
| Tokens/second | 321.1 tok/s | 321.8 tok/s | - |
| Time to First Token | 0.49s | 0.45s |
Capabilities
Feature Comparison
| Feature | GPT-OSS-120b | GPT-OSS-20b |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | GPT-OSS-120b | GPT-OSS-20b |
|---|---|---|
| License | Open Source | Open Source |
| Author | OpenAI | OpenAI |
| Released | Aug 2025 | Aug 2025 |
GPT-OSS-120b Modalities
Input
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Output
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GPT-OSS-20b Modalities
Input
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Output
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