gpt-oss-20b

gpt-oss-20b by OpenAI excels in the Coding category, where it ranks #156 with a composite score of 57/100. 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... It is particularly strong in areas highlighted by its top benchmark performance and adoption metrics, making it suitable for both individual developers and enterprise teams looking for a reliable coding solution.

gpt-oss-20b is priced at $0.03 per million input tokens and $0.14 per million output tokens (USD). Contact the provider for volume discounts and enterprise pricing. Pricing is competitive within the coding category and reflects the model's quality-to-cost ratio.

In the Coding category, gpt-oss-20b holds rank #156 out of 341 models tracked. Its quality rank is #156 and adoption rank is #156. You can use our comparison tool at /compare to see detailed side-by-side metrics with specific alternatives. Key differentiators include its composite scoring across benchmarks, community sentiment, and real-world adoption rates.

gpt-oss-20b has been evaluated across 6 different signals. Its strongest areas include Capabilities (67/100), Benchmarks (56/100), Pricing (100/100). These scores are derived from industry-standard benchmarks, community ratings, and real-world performance metrics. The composite score of 57/100 reflects a weighted combination of all tracked signals.

gpt-oss-20b is a paid model, though some providers may offer trial credits or limited free tiers for evaluation. Check OpenAI's website for current free tier availability and promotional offers.

gpt-oss-20b supports a 131K token context window (131,072 tokens total). That translates to roughly 98,304 words in a single prompt. This is large enough to process entire codebases, research papers, or long conversation histories in one shot.

gpt-oss-20b can generate up to 131K output tokens (131,072 tokens) per response. That is roughly 98,304 words. This is enough for generating complete code files, detailed reports, or long-form content in a single response.

gpt-oss-20b supports function/tool calling, structured JSON output, extended reasoning/chain-of-thought, streaming responses. Function calling lets you integrate it with external APIs and tools programmatically. These capabilities determine which workflows and integrations the model can handle natively.

Yes, gpt-oss-20b is an open-source model. You can download the weights, run it locally, fine-tune it for your use case, or deploy it on your own infrastructure. Many cloud providers also offer hosted versions if you prefer not to manage the infrastructure yourself. Self-hosting gives you full control over data privacy and eliminates per-token API costs.

gpt-oss-20b was developed by OpenAI. It was released on August 5, 2025. You can access it through OpenAI's API or download the model weights directly. Check our provider page for all models from OpenAI and how they compare against each other.

Pick gpt-oss-20b when you need a budget-friendly option for high-volume, simpler tasks where you prioritize cost over peak performance. If your task is straightforward text completion or classification, a cheaper model might give you 90% of the quality at a fraction of the price. Run a quick benchmark on your actual use case before committing.

You can access gpt-oss-20b through OpenAI's API using standard HTTP requests or their official SDK. Most providers support OpenAI-compatible endpoints, so switching between models often requires changing just the model name in your API call. Streaming is supported for real-time token-by-token output. For production use, implement proper error handling, rate limiting, and cost monitoring.