OpenAI: gpt-oss-20b

reasoning

gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license.

Intelligence
Reasoning
Speed
Context
131K
Max output
131K
Input price
$0.03/1M tokens
Output price
$0.11/1M tokens
Capabilities
vision
tool call
structured output
reasoning
json mode
streaming
fine tuning
batch
Details
Model IDopenai/gpt-oss-20b
Provider OpenRouter
Creator OpenAI
Familygpt-oss
Statusactive
Input modalitiestext
Output modalitiestext
Knowledge cutoff2024-05
Release date
Deprecation date
Typereasoning
Reasoning tokensYes
Max input
Sourceofficial
Last updated2026-03-21
Pricing
Input
$0.03
Output
$0.11
Cache write
Cache read
$0.02
Batch in
Batch out
Family Comparison: gpt-oss
ModelContextMax outInputOutput
131K131K
131K131K
OpenAI: gpt-oss-20bRT
131K131K$0.03$0.11
131K$0.04$0.19
131K66K$0.08$0.3
API
GET/v1/models/openrouter/openai/gpt-oss-20b

OpenAI: gpt-oss-20b

openai/gpt-oss-20b

gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license.

Changes · 2 entries
openai/gpt-oss-20bupdateb50649fMar 21, 2026, 11:58 PM
pricingoutput$0.14$0.11cached input$0.015
max_output_tokens131072
openai/gpt-oss-20bcreate7f5c66fMar 21, 2026, 05:16 AM