OpenAI
OpenAI GPT-6 model for focused, high-volume workloads where cost efficiency is the priority.
1.05M ctxUSD 0.10 / 1M input tok; USD 0.50 / 1M output tok
Introducing gpt-oss-20bOpenAIReleased September 4, 2025
gpt-oss-20b
Medium-sized Apache 2.0 open-weight model with 21B parameters (3.6B active), designed for local execution on consumer GPUs.
reasoning-llmOpen WeightsFree Open Weights (Consumer GPU)Context: 131.072K (131,072 tokens)Arena ELO: 1310
Technical Specifications
Architecture Type
Lightweight Sparse MoE Reasoning Model
Total Parameters
21B
Active Parameters (MoE)
3.6B
Context Window
131.072K (131,072 tokens)
Max Output Tokens
32.768K (32,768 tokens)
Knowledge Cutoff
October 2024
Supported Modalities
text, code, reasoning
License & Access
Apache 2.0
Weights Formats
safetensors, gguf, fp8, awq
Benchmark Evaluations
Math500
81.2
Mmlu Pro
68.9
Humaneval
86.4
Chatbot Arena ELO
1310
Deep Architectural Overview
gpt-oss-20b delivers native reasoning, agentic tool use, and fast local execution on consumer hardware (16GB VRAM). Perfect for private edge deployment, offline analysis, and fine-tuning.
Strengths & Considerations
Core Strengths
- Runs on consumer GPUs (RTX 4080 / Apple Silicon)
- Apache 2.0 license with no copyleft restrictions
- Native reasoning and tool calling support
Known Limitations
- Smaller knowledge capacity than 120B model
Token & API Pricing
Input Tokens (1M)Free (Open Weights)
Output Tokens (1M)Free (Open Weights)
Self-Hosted Min VRAM16 GB
Pricing is verified directly against OpenAI's developer documentation and API rate sheets.
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