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...
With CoreAI, you can start chatting with OpenAI: gpt-oss-20b (batch) instantly — no separate subscription needed. CoreAI lets you chat with OpenAI: gpt-oss-20b (batch) alongside 300+ other AI models from OpenAI and other providers like OpenAI, Anthropic, Google, Meta, and more.
Among the 378 chat models on CoreAI, OpenAI: gpt-oss-20b (batch) ranks #261 by context window — 131K tokens, roughly 98,304 words or 197 pages of text in a single conversation. On price, it is the #16 cheapest of 124 budget-tier models by input cost. It joined the catalog on 2025-08-05. It supports step-by-step reasoning (thinking mode).
Every model in this table is available on CoreAI — open the web app and run the same prompt through OpenAI: gpt-oss-20b (batch) and OpenAI: GPT-5 Nano side by side to judge with your own eyes.
A typical question (about 1,000 tokens in, 500 out) runs $0.00015 on OpenAI: gpt-oss-20b (batch)'s raw per-token rates; a heavy session with a 50K-token document costs about $0.004. On CoreAI you don't juggle these numbers — one subscription covers OpenAI: gpt-oss-20b (batch) and 300+ other models under a plan usage limit, with no API keys. See plans.
OpenAI: gpt-oss-20b (batch) handles 131K tokens of context — roughly 98,304 words, or about 197 pages of text in one conversation.
OpenAI: gpt-oss-20b (batch)'s underlying rates are $0.05 per 1M input tokens and $0.2 per 1M output tokens. On CoreAI it is included in one subscription alongside 300+ models, so there is no per-token billing to manage.
No — OpenAI: gpt-oss-20b (batch) is text-only. If you need image understanding, its budget-tier peers with vision are listed in the comparison table above.
Yes. OpenAI: gpt-oss-20b (batch) can work through problems step by step before answering; on CoreAI you can toggle thinking mode per message.
Open the CoreAI web app or the iOS/Android app, pick OpenAI: gpt-oss-20b (batch) in the model selector, and chat — no API key, no per-token billing. One subscription covers OpenAI: gpt-oss-20b (batch) and 300+ other models.
The closest alternatives on CoreAI are OpenAI: GPT-5 Nano, Upstage: Solar Pro 3, IBM: Granite 4.0 Micro — similar tier and capability. The fastest way to choose is running one prompt through them side by side in CoreAI's Compare view.
Chat with OpenAI: gpt-oss-20b (batch) and 300+ other AI models — all in one app.