gpt-oss-20b (batch)

OpenAI · Released August 2025 · Knowledge cutoff June 2024

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 part of OpenAI's GPT family, where Sol, Luna and Terra mark the current generation's capability tiers and Pro servings trade speed for deeper computation.

Facts and pricing

Provider

OpenAI

Context window

131K tokens

Input price

0.55 credits / 1M tokens ($0.050 raw)

Output price

2.2 credits / 1M tokens ($0.20 raw)

Vision (image input)

No

Tool calling

No

Extended reasoning

No

Credits are what Zeplik bills: 1 credit = $0.10, computed from the raw provider rate with a 1.10x margin. Raw prices shown per 1M tokens.

What gpt-oss-20b (batch) is best for

• Balanced everyday work: writing, questions, brainstorming and summarization

Example prompts

Prompts that suit a general purpose model like gpt-oss-20b (batch):

• Help me outline a talk about what I learned this year
• Compare these two paragraphs and tell me which is clearer and why
• Draft a polite reply declining this invitation
• Explain this concept with a concrete everyday analogy

OpenAI family

All 90 OpenAI models

Frequently asked questions

What is gpt-oss-20b (batch)?

gpt-oss-20b (batch) is an AI model by OpenAI. 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...

How much does gpt-oss-20b (batch) cost on Zeplik?

Input tokens cost 0.55 credits per million and output tokens 2.2 credits per million (1 credit = $0.10; the raw provider rates are $0.050 and $0.20 per million). New accounts start with free credits.

How long can a conversation with gpt-oss-20b (batch) be?

gpt-oss-20b (batch) has a 131K-token context window (131,072 tokens), which covers the conversation plus any documents you attach.

Does gpt-oss-20b (batch) support images and tools?

gpt-oss-20b (batch) is text-only and does not support tool calling.

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