Key Takeaways
GPT-4o wins:
- Supports vision
- Supports tool calls
GPT-OSS-120b 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-120b
Benchmark Advantage
GPT-OSS-120b
Context Window
GPT-OSS-120b
Speed
GPT-OSS-120b
Pricing Comparison
Price Comparison
| Metric | GPT-4o | GPT-OSS-120b | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $2.50 | $0.04 | GPT-OSS-120b |
| Output (per 1M tokens) | $10.00 | $0.19 | GPT-OSS-120b |
| Cache Read (per 1M) | $1250000.00 | N/A | GPT-4o |
Using a 3:1 input/output ratio, GPT-OSS-120b is 98% cheaper overall.
GPT-4o Providers
OpenAI $2.50 (Cheapest)
Vercel $2.50 (Cheapest)
OpenRouter $2.50 (Cheapest)
Azure $2.50 (Cheapest)
GPT-OSS-120b Providers
GMICloud $0.02 (Cheapest)
Chutes $0.04
OpenRouter $0.04
SiliconFlow $0.05
NCompass $0.05
Benchmark Comparison
8
Benchmarks Compared
1
GPT-4o Wins
3
GPT-OSS-120b Wins
Benchmark Scores
| Benchmark | GPT-4o | GPT-OSS-120b | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 15.6 | 32.9 | |
Coding Index Code generation & understanding | - | 27.6 | - |
Math Index Mathematical reasoning | - | 93.4 | - |
MMLU Pro Academic knowledge | - | 80.8 | - |
GPQA Graduate-level science | 52.1 | 78.2 | |
LiveCodeBench Competitive programming | 31.7 | 87.8 | |
Aider Real-world code editing | 74.4 | 41.8 | |
AIME Competition math | 11.7 | - | - |
GPT-OSS-120b significantly outperforms in coding benchmarks.
Cost vs Quality
X-axis:
Y-axis:
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Other models
Context & Performance
Context Window
GPT-4o
128,000
tokens
Max output: 16,384 tokens
GPT-OSS-120b
131,072
tokens
GPT-OSS-120b has a 2% larger context window.
Speed Performance
| Metric | GPT-4o | GPT-OSS-120b | Winner |
|---|---|---|---|
| Tokens/second | 77.3 tok/s | 337.9 tok/s | |
| Time to First Token | 0.51s | 0.42s |
GPT-OSS-120b responds 337% faster on average.
Capabilities
Feature Comparison
| Feature | GPT-4o | GPT-OSS-120b |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | GPT-4o | GPT-OSS-120b |
|---|---|---|
| License | Proprietary | Open Source |
| Author | OpenAI | OpenAI |
| Released | May 2024 | Aug 2025 |
GPT-4o Modalities
Input
textimagefile
Output
text
GPT-OSS-120b Modalities
Input
text
Output
text