OpenAI: gpt-oss-20b (free)
by openai
Availability
Available 89 of 89 tracked days. Daily snapshots show whether this model was accessible as a free model on OpenRouter.
| Apr | May | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Model | Days | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| OpenAI: gpt-oss-20b (free) | 28 | ||||||||||||||||||||||||||||||
About
gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass, optimized for...
Specifications
Error Rate
Based on feedback reported by Free LLM Router users. Error rate reflects the percentage of requests that encountered issues such as rate limiting, unavailability, or errors. Learn more.
| Model | 1h | 6h | 24h | 7d | 30d |
|---|---|---|---|---|---|
| OpenAI: gpt-oss-20b (free) | - | - | - | 100.0% | 45.7% |
Similar Models
More from Openai
Frequently Asked Questions
Is OpenAI: gpt-oss-20b (free) free to use?
Yes, OpenAI: gpt-oss-20b (free) is completely free to use through OpenRouter. You can access it via the Free LLM Router API at no cost.
What is the context window for OpenAI: gpt-oss-20b (free)?
OpenAI: gpt-oss-20b (free) supports a context window of 131K tokens (131,072 tokens).
What is the maximum output length for OpenAI: gpt-oss-20b (free)?
OpenAI: gpt-oss-20b (free) can generate up to 8K tokens (8,192 tokens) per response.
Does OpenAI: gpt-oss-20b (free) support function calling (tools)?
Yes, OpenAI: gpt-oss-20b (free) supports function calling / tool use, enabling it to interact with external APIs and services.
Does OpenAI: gpt-oss-20b (free) support reasoning?
Yes, OpenAI: gpt-oss-20b (free) supports reasoning capabilities, allowing it to show its step-by-step thought process.