Key Takeaways
Seed 1.6 Flash wins:
- Larger context window
- Supports vision
- Supports tool calls
GPT-OSS-120b wins:
- Cheaper input tokens
- Cheaper output tokens
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Better at math
Price Advantage
GPT-OSS-120b
Benchmark Advantage
GPT-OSS-120b
Context Window
Seed 1.6 Flash
Speed
GPT-OSS-120b
Pricing Comparison
Price Comparison
| Metric | Seed 1.6 Flash | GPT-OSS-120b | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $0.07 | $0.04 | GPT-OSS-120b |
| Output (per 1M tokens) | $0.30 | $0.19 | GPT-OSS-120b |
Using a 3:1 input/output ratio, GPT-OSS-120b is 42% cheaper overall.
Seed 1.6 Flash Providers
Seed $0.07 (Cheapest)
GPT-OSS-120b Providers
Chutes $0.04 (Cheapest)
SiliconFlow $0.05
Novita $0.05
Clarifai $0.09
Google $0.09
Benchmark Comparison
7
Benchmarks Compared
0
Seed 1.6 Flash Wins
0
GPT-OSS-120b Wins
Benchmark Scores
| Benchmark | Seed 1.6 Flash | GPT-OSS-120b | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | - | 33.3 | - |
Coding Index Code generation & understanding | - | 28.6 | - |
Math Index Mathematical reasoning | - | 93.4 | - |
MMLU Pro Academic knowledge | - | 80.8 | - |
GPQA Graduate-level science | - | 78.2 | - |
LiveCodeBench Competitive programming | - | 87.8 | - |
Aider Real-world code editing | - | 41.8 | - |
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
Seed 1.6 Flash
262,144
tokens
Max output: 32,768 tokens
GPT-OSS-120b
131,072
tokens
Seed 1.6 Flash has a 50% larger context window.
Speed Performance
| Metric | Seed 1.6 Flash | GPT-OSS-120b | Winner |
|---|---|---|---|
| Tokens/second | N/A | 311.5 tok/s | |
| Time to First Token | N/A | 0.47s |
Capabilities
Feature Comparison
| Feature | Seed 1.6 Flash | GPT-OSS-120b |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | Seed 1.6 Flash | GPT-OSS-120b |
|---|---|---|
| License | Open Source | Open Source |
| Author | Bytedance-seed | OpenAI |
| Released | Dec 2025 | Aug 2025 |
Seed 1.6 Flash Modalities
Input
imagetextvideo
Output
text
GPT-OSS-120b Modalities
Input
text
Output
text