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
| Metric | GPT-OSS-120b | GPT-OSS-20b | Winner |
|---|---|---|---|
| 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
| Benchmark | GPT-OSS-120b | GPT-OSS-20b | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 32.9 | 24.7 | |
Coding Index Code generation & understanding | 27.6 | 18.1 | |
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
Max output: 131,072 tokens
Speed Performance
| Metric | GPT-OSS-120b | GPT-OSS-20b | Winner |
|---|---|---|---|
| Tokens/second | 337.9 tok/s | 309.0 tok/s | |
| Time to First Token | 0.42s | 0.51s |
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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