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GPT-OSS-20B

OpenAI

92·Exceptional

Overall Trust Score

OpenAI's edge-optimized open-weight model released August 2025. 21B total params (3.6B active), Apache 2.0 license. Matches o3-mini despite small size. Runs in 16GB memory (edge devices).

open-source
apache-2.0
self-hosted
privacy
moe
reasoning
coding
on-premises
customizable
transparent
Version: 20250805
Last Evaluated: November 17, 2025
Official Website →

Trust Vector

Performance & Reliability

91

Flagship open-source performance. MoE architecture activates 5.1B of 117B params per token. Matches or beats o4-mini on most benchmarks.

task accuracy code
92
Methodology
Competition coding and tool use benchmarks
Evidence
Codeforces Benchmark
Matches o4-mini on competition coding
Date: 2025-08-05
TauBench Tool Calling
Exceeds o4-mini on tool calling
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17
task accuracy reasoning
93
Methodology
Math competition benchmarks
Evidence
AIME 2024 & 2025
Outperforms o3-mini on competition mathematics
Date: 2025-08-05
Chain-of-Thought Access
Full chain-of-thought reasoning process exposed
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17
task accuracy general
89
Methodology
General knowledge and domain-specific testing
Evidence
MMLU & HLE
Matches o4-mini on general problem solving
Date: 2025-08-05
HealthBench
Exceeds o4-mini on health-related queries
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17
output consistency
87
Methodology
Internal testing
Evidence
OpenAI Model Card
Configurable reasoning effort for consistency
Date: 2025-08-05
Confidence: mediumLast verified: 2025-11-17
latency p50
Value: 1.0s
Methodology
Median latency estimation
Evidence
Optimized Inference
Fast inference with MoE architecture
Date: 2025-08-05
Confidence: mediumLast verified: 2025-11-17
latency p95
Value: 2.2s
Methodology
95th percentile from community benchmarks
Evidence
Community Deployments
~2s on H100 hardware
Date: 2025-08-10
Confidence: mediumLast verified: 2025-11-17
context window
Value: 128,000 tokens
Methodology
Official specification
Evidence
OpenAI Technical Specs
128K context window natively supported
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17
uptime
99
Methodology
Self-hosting provides full control
Evidence
Self-Hosted Model
100% uptime when self-hosted
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17

Security

85

Good base security. Self-hosting provides complete control over safety guardrails and data handling.

prompt injection resistance
82
Methodology
OWASP LLM01 testing
Evidence
OpenAI Safety Testing
Good resistance, customizable for self-hosted
Date: 2025-08-05
Confidence: mediumLast verified: 2025-11-17
jailbreak resistance
81
Methodology
Adversarial testing
Evidence
Community Testing
Standard resistance, self-host allows custom guardrails
Date: 2025-08-10
Confidence: mediumLast verified: 2025-11-17
data leakage prevention
95
Methodology
Self-hosting analysis
Evidence
Self-Hosted Deployment
Complete data control when self-hosted
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17
output safety
83
Methodology
Safety testing
Evidence
OpenAI Safety
Standard safety training, customizable
Date: 2025-08-05
Confidence: mediumLast verified: 2025-11-17
api security
90
Methodology
Deployment security review
Evidence
Self-Hosted Security
Customer controls all API security when self-hosted
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17

Privacy & Compliance

97

Perfect privacy when self-hosted. No data sent to OpenAI. Full compliance control. Ideal for regulated industries.

data residency
Value: Anywhere (self-hosted)
Methodology
Self-hosting analysis
Evidence
Open-Weight Model
Deploy anywhere, full data residency control
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17
training data optout
100
Methodology
Privacy model analysis
Evidence
Self-Hosted Model
No data sent to OpenAI when self-hosted
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17
data retention
Value: 0 days (self-controlled)
Methodology
Self-hosting review
Evidence
Self-Hosted Deployment
Complete control over data retention
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17
pii handling
100
Methodology
Data flow analysis
Evidence
On-Premises Deployment
PII never leaves your infrastructure
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17
compliance certifications
95
Methodology
Compliance model review
Evidence
Self-Hosted Compliance
Inherit your infrastructure's certifications
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17
zero data retention
100
Methodology
Privacy architecture review
Evidence
Open-Weight Model
Complete control, zero external retention
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17

Trust & Transparency

94

Exceptional transparency. Full chain-of-thought access. Complete model weights and architecture disclosed. Open-source enables auditing.

explainability
96
Methodology
Reasoning transparency
Evidence
Full Chain-of-Thought
Complete access to reasoning process
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17
hallucination rate
85
Methodology
QA testing
Evidence
Benchmark Testing
Good factual accuracy
Date: 2025-08-05
Confidence: mediumLast verified: 2025-11-17
bias fairness
83
Methodology
Bias benchmarks
Evidence
OpenAI Model Card
Standard bias testing
Date: 2025-08-05
Confidence: mediumLast verified: 2025-11-17
uncertainty quantification
86
Methodology
Confidence assessment
Evidence
Model Behavior
Good uncertainty expression
Date: 2025-08-05
Confidence: mediumLast verified: 2025-11-17
model card quality
98
Methodology
Documentation review
Evidence
Comprehensive Model Card
Detailed technical specs, benchmarks, architecture
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17
training data transparency
90
Methodology
Training data disclosure review
Evidence
OpenAI Documentation
Mostly English, STEM, coding focus disclosed
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17
guardrails
85
Methodology
Safety mechanism review
Evidence
Customizable Guardrails
Standard safety, customizable when self-hosted
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17

Operational Excellence

95

Exceptional operational flexibility. Apache 2.0 enables commercial use. Massive deployment ecosystem. Self-host or use managed platforms.

api design quality
92
Methodology
API compatibility review
Evidence
Deployment Platforms
Works with vLLM, Ollama, llama.cpp, Azure, AWS, etc.
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17
sdk quality
96
Methodology
SDK ecosystem review
Evidence
GitHub Repository
Official repo, Hugging Face integration
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17
versioning policy
98
Methodology
Version stability analysis
Evidence
Open Weights
Weights frozen, no deprecation risk
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17
monitoring observability
94
Methodology
Monitoring capability review
Evidence
Self-Hosted Control
Full observability when self-hosted
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17
support quality
88
Methodology
Support ecosystem assessment
Evidence
Community Support
GitHub issues, community forums, deployment partners
Date: 2025-08-05
Confidence: mediumLast verified: 2025-11-17
ecosystem maturity
97
Methodology
Ecosystem breadth analysis
Evidence
Deployment Partners
Azure, Hugging Face, AWS, Fireworks, Together AI, Databricks, Vercel, Cloudflare, OpenRouter
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17
license terms
100
Methodology
License review
Evidence
Apache 2.0 License
Permissive Apache 2.0, no copyleft, no patent risk
Date: 2025-08-05
Confidence: highLast verified: 2025-11-17

✨ Strengths

  • Apache 2.0 open-weight license enables commercial use without restrictions
  • Matches o3-mini performance despite small 21B size (3.6B active)
  • Runs in only 16GB memory (edge devices, consumer GPUs, IoT deployment)
  • Complete data privacy when self-hosted (zero external data transmission)
  • Ultra-low infrastructure costs (~$0.50-1/hr, 1/4 cost of 120B)
  • Full chain-of-thought access and massive deployment ecosystem

⚠️ Limitations

  • Smaller capacity than gpt-oss-120b for complex tasks
  • Self-hosting complexity and infrastructure costs
  • Community support vs enterprise SLA
  • Slightly lower performance than flagship closed models
  • No built-in safety guardrails (customizable but requires setup)

📊 Metadata

pricing:
input: Free (self-hosted)
output: Free (self-hosted)
notes: Infrastructure costs only: ~$0.50-1/hr for consumer GPUs. Can run on edge devices. Free for download and commercial use under Apache 2.0.
last verified: 2025-11-17
context window: 128000
languages:
0: English
1: Spanish
2: French
3: German
4: Italian
5: Portuguese
6: Japanese
7: Korean
8: Chinese
modalities:
0: text
api endpoint: Self-hosted (various platforms)
model download: https://huggingface.co/openai/gpt-oss-20b
github: https://github.com/openai/gpt-oss
open source: true
license: Apache 2.0
architecture: Mixture-of-Experts (MoE) Transformer
parameters: 21B total (3.6B active per token)
memory requirement: 16GB (edge-optimized)
tokenizer: o200k_harmony
deployment platforms:
0: Azure
1: AWS
2: Hugging Face
3: vLLM
4: Ollama
5: llama.cpp
6: LM Studio
7: Fireworks
8: Together AI
9: Baseten
10: Databricks
11: Vercel
12: Cloudflare
13: OpenRouter

Use Case Ratings

code generation

91

Excellent coding. Matches o4-mini. Configurable reasoning effort. Full chain-of-thought debugging.

customer support

87

Good for customer support. Self-host for complete data privacy. Configurable reasoning for cost control.

content creation

85

Strong content creation. Self-hosting enables unlimited generation without API costs.

data analysis

89

Excellent for data analysis. Keep sensitive data on-premises. Full chain-of-thought for transparency.

research assistant

90

Outstanding for research. 128K context. Self-host proprietary research data. Full reasoning transparency.

legal compliance

95

Perfect for legal. Self-host for complete compliance. No data leaves premises. Apache 2.0 license clarity.

healthcare

94

Ideal for healthcare. Self-host for HIPAA. Complete PHI privacy. No external data transmission.

financial analysis

91

Excellent for finance. Outperforms o3-mini on math. Self-host proprietary financial data.

education

88

Great for education. Full chain-of-thought shows reasoning steps. Self-host for institutional control.

creative writing

84

Good creative writing. Unlimited generation when self-hosted. No API costs for iteration.