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OpenAI: gpt-oss-20b (free)

openai/gpt-oss-20b:free

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...

Source-linkedClosed weights
Report data
Context window131.072K
Maximum output32.768K
Provider offers0
Knowledge cutoffUndisclosed
Capabilities

What this model supports

ReasoningNo
Tool callingNo
Structured outputNo
AttachmentsNo
Temperature controlNo
Open weightsNo
Creator
OpenAI
Family
Not documented
Modalities
Text
License
Not documented
Release date
Not documented
Model ID
openai/gpt-oss-20b:free
Market availability

Provider pricing

Report price →
No known providers available.
Evidence

Published benchmark results

Agentic Index vs top 8 models
GPT-5.6 Sol
54.0
Claude Fable 5
52.8
GPT-5.6 Terra
47.4
Anthropic: Claude Opus 4.8
47.2
Claude Sonnet 5
46.7
xAI: Grok 4.5
45.7
GPT-5.6 Luna
45.6
OpenAI: gpt-oss-20b (free)
3.1
Coding Index vs top 8 models
GPT-5.6 Sol
77.4
GPT-5.6 Terra
76.7
Claude Fable 5
76.5
GPT-5.5
74.9
Anthropic: Claude Opus 4.8
74.3
Anthropic: Claude Opus 4.7
73.6
xAI: Grok 4.5
72.4
OpenAI: gpt-oss-20b (free)
20.7
Design Arena: dataviz vs top 8 models
Claude Fable 5
1372.0
Z.ai: GLM 5.1
1366.0
xAI: Grok 4.5
1330.0
Anthropic: Claude Opus 4.6
1321.0
Anthropic: Claude Opus 4.7
1320.0
Z.ai: GLM 5.2
1318.0
Anthropic: Claude Sonnet 4.6
1317.0
OpenAI: gpt-oss-20b (free)
974.0
Design Arena: website vs top 8 models
Z.ai: GLM 5.2
1346.0
Claude Fable 5
1336.0
Anthropic: Claude Opus 4.6
1331.0
Anthropic: Claude Opus 4.7
1329.0
xAI: Grok 4.5
1323.0
Anthropic: Claude Sonnet 4.6
1320.0
Claude Sonnet 5
1314.0
OpenAI: gpt-oss-20b (free)
888.0
Intelligence Index vs top 8 models
Claude Fable 5
59.9
GPT-5.6 Sol
58.9
Anthropic: Claude Opus 4.8
55.7
GPT-5.6 Terra
55.0
GPT-5.5
54.8
xAI: Grok 4.5
53.8
Anthropic: Claude Opus 4.7
53.5
OpenAI: gpt-oss-20b (free)
14.9