Key Takeaways
GPT-4 wins:
- Supports tool calls
GPT-OSS-20b wins:
- Cheaper input tokens
- Cheaper output tokens
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Better at math
Price Advantage
GPT-OSS-20b
Benchmark Advantage
GPT-OSS-20b
Context Window
GPT-OSS-20b
Speed
GPT-OSS-20b
Pricing Comparison
Price Comparison
| Metric | GPT-4 | GPT-OSS-20b | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $30.00 | $0.02 | GPT-OSS-20b |
| Output (per 1M tokens) | $60.00 | $0.10 | GPT-OSS-20b |
Using a 3:1 input/output ratio, GPT-OSS-20b is 100% cheaper overall.
GPT-4 Providers
OpenAI $30.00 (Cheapest)
OpenRouter $30.00 (Cheapest)
Azure $30.00 (Cheapest)
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
0
GPT-4 Wins
2
GPT-OSS-20b Wins
Benchmark Scores
| Benchmark | GPT-4 | GPT-OSS-20b | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 12.8 | 24.7 | |
Coding Index Code generation & understanding | 13.1 | 18.1 | |
Math Index Mathematical reasoning | - | 89.3 | - |
MMLU Pro Academic knowledge | - | 74.8 | - |
GPQA Graduate-level science | - | 68.8 | - |
LiveCodeBench Competitive programming | - | 77.7 | - |
Aider Real-world code editing | 67.7 | - | - |
GPT-OSS-20b significantly outperforms in coding benchmarks.
Cost vs Quality
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Y-axis:
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Other models
Context & Performance
Context Window
GPT-4
8,191
tokens
Max output: 4,096 tokens
GPT-OSS-20b
131,072
tokens
Max output: 131,072 tokens
GPT-OSS-20b has a 94% larger context window.
Speed Performance
| Metric | GPT-4 | GPT-OSS-20b | Winner |
|---|---|---|---|
| Tokens/second | 25.4 tok/s | 309.0 tok/s | |
| Time to First Token | 0.81s | 0.51s |
GPT-OSS-20b responds 1119% faster on average.
Capabilities
Feature Comparison
| Feature | GPT-4 | 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-4 | GPT-OSS-20b |
|---|---|---|
| License | Proprietary | Open Source |
| Author | OpenAI | OpenAI |
| Released | May 2023 | Aug 2025 |
GPT-4 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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