Key Takeaways
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
GLM 4.5 wins:
- Supports tool calls
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-OSS-20b | GLM 4.5 | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $0.03 | $0.55 | GPT-OSS-20b |
| Output (per 1M tokens) | $0.14 | $2.00 | GPT-OSS-20b |
Using a 3:1 input/output ratio, GPT-OSS-20b is 94% cheaper overall.
GPT-OSS-20b Providers
DeepInfra $0.03 (Cheapest)
Parasail $0.04
Novita $0.04
NCompass $0.04
Clarifai $0.04
GLM 4.5 Providers
WandB $0.55 (Cheapest)
Z.AI $0.60
Nebius $0.60
Novita $0.60
Benchmark Comparison
6
Benchmarks Compared
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GPT-OSS-20b Wins
0
GLM 4.5 Wins
Benchmark Scores
| Benchmark | GPT-OSS-20b | GLM 4.5 | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 24.5 | - | - |
Coding Index Code generation & understanding | 18.5 | - | - |
Math Index Mathematical reasoning | 89.3 | - | - |
MMLU Pro Academic knowledge | 74.8 | - | - |
GPQA Graduate-level science | 68.8 | - | - |
LiveCodeBench Competitive programming | 77.7 | - | - |
GPT-OSS-20b significantly outperforms in coding benchmarks.
Cost vs Quality
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GPT-OSS-20b
Other models
Context & Performance
Context Window
GPT-OSS-20b
131,072
tokens
GLM 4.5
131,000
tokens
Max output: 131,000 tokens
GPT-OSS-20b has a 0% larger context window.
Speed Performance
| Metric | GPT-OSS-20b | GLM 4.5 | Winner |
|---|---|---|---|
| Tokens/second | 293.3 tok/s | N/A | |
| Time to First Token | 0.51s | N/A |
Capabilities
Feature Comparison
| Feature | GPT-OSS-20b | GLM 4.5 |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | GPT-OSS-20b | GLM 4.5 |
|---|---|---|
| License | Open Source | Proprietary |
| Author | OpenAI | Z-ai |
| Released | Aug 2025 | Jul 2025 |
GPT-OSS-20b Modalities
Input
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Output
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GLM 4.5 Modalities
Input
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Output
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